Reading Data commited in other session
Hi
how can I to read Data commted in other session ?
Example: in package the process does update and in other session I want to do select and read data from table with data commited , Is possible ?
Hi,
Once data is commited you can read it very well by default. Whats wrong with reading commited data by other session?
Thanks!
M T
Similar Messages
-
How to view uncommited data from other session
Hi
I want to see data that is incommited from other sql session. How can I see it?
Generally After commit data is available to other sessions.
Please answer me ASAP.
Wating for reply
Jigar,You cannot do 'dirty reads' in Oracle. You can only see committed changes, and you have the choice of seeing committed changes after each individual statement in your transaction (default), or only after a transaction has finished. With the default level, running the same query multiple times within a transaction may yield different results.
I suspect that you have used this approach with Sybase or SQL Server for performance reasons, but you will not need to do this with Oracle. I recommend you read Tom Kyte's "Expert One-On-One: Oracle" book for an excellent discussion of Oracle's locking and concurrency mechanisms.
Hi
I want to see data that is incommited from other sql session. How can I see it?
Generally After commit data is available to other sessions.
Please answer me ASAP.
Wating for reply
Jigar, -
Performance issue showing read by other session Event
Hi All,
we are having a severe performance issue in my database when we are running batch jobs.
This was a new database(11.2.0.2) and we are testing the performance by running some batch jobs. These batch jobs included some inserts and updates.
I am seeing read by other session in top 5 timed events and cache buffers chains in Latch Miss Sources section.
Please help me to solve this out.
Inst Num Startup Time Release RAC
1 27-Feb-12 09:03 11.2.0.2.0 NO
Platform CPUs Cores Sockets Memory(GB)
Linux x86 64-bit 8 8 8 48.00
Snap Id Snap Time Sessions Curs/Sess
Begin Snap: 5605 29-Feb-12 03:00:27 63 4.5
End Snap: 5614 29-Feb-12 12:00:47 63 4.3
Elapsed: 540.32 (mins)
DB Time: 1,774.23 (mins)
Cache Sizes Begin End
~~~~~~~~~~~ ---------- ----------
Buffer Cache: 1,952M 1,952M Std Block Size: 16K
Shared Pool Size: 1,024M 1,024M Log Buffer: 18,868K
Load Profile Per Second Per Transaction Per Exec Per Call
~~~~~~~~~~~~ --------------- --------------- ---------- ----------
DB Time(s): 3.3 0.8 0.02 0.05
DB CPU(s): 1.1 0.3 0.01 0.02
Redo size: 55,763.8 13,849.3
Logical reads: 23,906.6 5,937.4
Block changes: 325.7 80.9
Physical reads: 665.6 165.3
Physical writes: 40.4 10.0
User calls: 60.7 15.1
Parses: 10.6 2.6
Hard parses: 1.1 0.3
W/A MB processed: 0.6 0.2
Logons: 0.1 0.0
Executes: 151.2 37.6
Rollbacks: 0.0 0.0
Transactions: 4.0
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 99.94 Redo NoWait %: 100.00
Buffer Hit %: 97.90 In-memory Sort %: 100.00
Library Hit %: 98.06 Soft Parse %: 90.16
Execute to Parse %: 92.96 Latch Hit %: 100.00
Parse CPU to Parse Elapsd %: 76.71 % Non-Parse CPU: 98.57
Shared Pool Statistics Begin End
Memory Usage %: 89.38 87.96
% SQL with executions>1: 97.14 95.15
% Memory for SQL w/exec>1: 96.05 92.46
Top 5 Timed Foreground Events
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Avg
wait % DB
Event Waits Time(s) (ms) time Wait Class
db file sequential read 14,092,706 65,613 5 61.6 User I/O
DB CPU 34,819 32.7
read by other session 308,534 1,260 4 1.2 User I/O
direct path read 97,454 987 10 .9 User I/O
db file scattered read 71,870 910 13 .9 User I/O
Host CPU (CPUs: 8 Cores: 8 Sockets: 8)
~~~~~~~~ Load Average
Begin End %User %System %WIO %Idle
0.43 0.36 13.7 0.6 9.7 85.7
Instance CPU
~~~~~~~~~~~~
% of total CPU for Instance: 13.5
% of busy CPU for Instance: 94.2
%DB time waiting for CPU - Resource Mgr: 0.0
Memory Statistics
~~~~~~~~~~~~~~~~~ Begin End
Host Mem (MB): 49,152.0 49,152.0
SGA use (MB): 3,072.0 3,072.0
PGA use (MB): 506.5 629.1
% Host Mem used for SGA+PGA: 7.28 7.53
Time Model Statistics
-> Total time in database user-calls (DB Time): 106453.8s
-> Statistics including the word "background" measure background process
time, and so do not contribute to the DB time statistic
-> Ordered by % or DB time desc, Statistic name
Statistic Name Time (s) % of DB Time
sql execute elapsed time 105,531.1 99.1
DB CPU 34,818.8 32.7
parse time elapsed 714.7 .7
hard parse elapsed time 684.8 .6
PL/SQL execution elapsed time 161.9 .2
PL/SQL compilation elapsed time 44.2 .0
connection management call elapsed time 16.9 .0
hard parse (sharing criteria) elapsed time 10.2 .0
hard parse (bind mismatch) elapsed time 9.4 .0
sequence load elapsed time 2.9 .0
repeated bind elapsed time 0.5 .0
failed parse elapsed time 0.0 .0
DB time 106,453.8
background elapsed time 1,753.9
background cpu time 61.7
Operating System Statistics
-> *TIME statistic values are diffed.
All others display actual values. End Value is displayed if different
-> ordered by statistic type (CPU Use, Virtual Memory, Hardware Config), Name
Statistic Value End Value
BUSY_TIME 3,704,415
IDLE_TIME 22,203,740
IOWAIT_TIME 2,517,864
NICE_TIME 3
SYS_TIME 145,696
USER_TIME 3,557,758
LOAD 0 0
RSRC_MGR_CPU_WAIT_TIME 0
VM_IN_BYTES 358,813,045,760
VM_OUT_BYTES 29,514,830,848
PHYSICAL_MEMORY_BYTES 51,539,607,552
NUM_CPUS 8
NUM_CPU_CORES 8
NUM_CPU_SOCKETS 8
GLOBAL_RECEIVE_SIZE_MAX 4,194,304
GLOBAL_SEND_SIZE_MAX 1,048,586
TCP_RECEIVE_SIZE_DEFAULT 87,380
TCP_RECEIVE_SIZE_MAX 4,194,304
TCP_RECEIVE_SIZE_MIN 4,096
TCP_SEND_SIZE_DEFAULT 16,384
TCP_SEND_SIZE_MAX 4,194,304
TCP_SEND_SIZE_MIN 4,096
Operating System Statistics -
Snap Time Load %busy %user %sys %idle %iowait
29-Feb 03:00:27 0.4 N/A N/A N/A N/A N/A
29-Feb 04:00:35 1.4 11.9 11.2 0.6 88.1 14.3
29-Feb 05:00:41 1.7 13.8 13.2 0.6 86.2 15.8
29-Feb 06:00:48 1.5 14.0 13.5 0.6 86.0 12.3
29-Feb 07:01:00 1.8 16.3 15.8 0.5 83.7 10.4
29-Feb 08:00:12 2.6 23.2 22.5 0.6 76.8 12.6
29-Feb 09:00:26 1.3 16.6 16.0 0.5 83.4 5.7
29-Feb 10:00:33 1.2 13.8 13.3 0.5 86.2 2.0
29-Feb 11:00:43 1.3 14.5 14.0 0.5 85.5 3.8
29-Feb 12:00:47 0.4 4.9 4.2 0.7 95.1 10.6
Foreground Wait Class
-> s - second, ms - millisecond - 1000th of a second
-> ordered by wait time desc, waits desc
-> %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
-> Captured Time accounts for 97.9% of Total DB time 106,453.79 (s)
-> Total FG Wait Time: 69,415.64 (s) DB CPU time: 34,818.79 (s)
Avg
%Time Total Wait wait
Wait Class Waits -outs Time (s) (ms) %DB time
User I/O 14,693,843 0 69,222 5 65.0
DB CPU 34,819 32.7
Commit 40,629 0 119 3 0.1
System I/O 26,504 0 57 2 0.1
Network 1,945,010 0 11 0 0.0
Other 125,200 99 4 0 0.0
Application 2,673 0 2 1 0.0
Concurrency 3,059 0 1 0 0.0
Configuration 31 19 0 15 0.0
Foreground Wait Events
-> s - second, ms - millisecond - 1000th of a second
-> Only events with Total Wait Time (s) >= .001 are shown
-> ordered by wait time desc, waits desc (idle events last)
-> %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Avg
%Time Total Wait wait Waits % DB
Event Waits -outs Time (s) (ms) /txn time
db file sequential read 14,092,706 0 65,613 5 108.0 61.6
read by other session 308,534 0 1,260 4 2.4 1.2
direct path read 97,454 0 987 10 0.7 .9
db file scattered read 71,870 0 910 13 0.6 .9
db file parallel read 35,001 0 372 11 0.3 .3
log file sync 40,629 0 119 3 0.3 .1
control file sequential re 26,504 0 57 2 0.2 .1
direct path read temp 14,499 0 49 3 0.1 .0
direct path write temp 9,186 0 28 3 0.1 .0
SQL*Net message to client 1,923,973 0 5 0 14.7 .0
SQL*Net message from dblin 1,056 0 5 5 0.0 .0
Disk file operations I/O 8,848 0 2 0 0.1 .0
ASM file metadata operatio 36 0 2 54 0.0 .0
SQL*Net break/reset to cli 2,636 0 1 1 0.0 .0
ADR block file read 472 0 1 1 0.0 .0
os thread startup 8 0 1 74 0.0 .0
SQL*Net more data to clien 17,656 0 1 0 0.1 .0
asynch descriptor resize 123,852 100 0 0 0.9 .0
local write wait 110 0 0 4 0.0 .0
utl_file I/O 55,635 0 0 0 0.4 .0
log file switch (private s 8 0 0 52 0.0 .0
cursor: pin S wait on X 2 0 0 142 0.0 .0
enq: KO - fast object chec 13 0 0 20 0.0 .0
PX Deq: Slave Session Stat 248 0 0 1 0.0 .0
enq: RO - fast object reus 18 0 0 11 0.0 .0
latch: cache buffers chain 2,511 0 0 0 0.0 .0
latch: shared pool 195 0 0 1 0.0 .0
CSS initialization 12 0 0 8 0.0 .0
PX qref latch 54 100 0 2 0.0 .0
SQL*Net more data from cli 995 0 0 0 0.0 .0
SQL*Net more data from dbl 300 0 0 0 0.0 .0
kksfbc child completion 1 100 0 56 0.0 .0
library cache: mutex X 244 0 0 0 0.0 .0
PX Deq: Signal ACK RSG 124 0 0 0 0.0 .0
undo segment extension 6 100 0 7 0.0 .0
PX Deq: Signal ACK EXT 124 0 0 0 0.0 .0
library cache load lock 3 0 0 9 0.0 .0
ADR block file write 45 0 0 1 0.0 .0
CSS operation: action 12 0 0 2 0.0 .0
reliable message 28 0 0 1 0.0 .0
CSS operation: query 72 0 0 0 0.0 .0
latch: row cache objects 14 0 0 1 0.0 .0
enq: SQ - contention 17 0 0 0 0.0 .0
latch free 32 0 0 0 0.0 .0
buffer busy waits 52 0 0 0 0.0 .0
enq: PS - contention 16 0 0 0 0.0 .0
enq: TX - row lock content 6 0 0 1 0.0 .0
SQL*Net message to dblink 1,018 0 0 0 0.0 .0
cursor: pin S 23 0 0 0 0.0 .0
latch: cache buffers lru c 8 0 0 0 0.0 .0
SQL*Net message from clien 1,923,970 0 944,508 491 14.7
jobq slave wait 66,732 100 33,334 500 0.5
Streams AQ: waiting for me 6,481 100 32,412 5001 0.0
wait for unread message on 32,858 98 32,411 986 0.3
PX Deq: Execution Msg 1,448 0 190 131 0.0
PX Deq: Execute Reply 1,196 0 74 62 0.0
HS message to agent 228 0 4 19 0.0
single-task message 42 0 4 97 0.0
PX Deq Credit: send blkd 904 0 2 3 0.0
PX Deq Credit: need buffer 205 0 1 3 0.0
Foreground Wait Events
-> s - second, ms - millisecond - 1000th of a second
-> Only events with Total Wait Time (s) >= .001 are shown
-> ordered by wait time desc, waits desc (idle events last)
-> %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Avg
%Time Total Wait wait Waits % DB
Event Waits -outs Time (s) (ms) /txn time
PX Deq: Table Q Normal 4,291 0 1 0 0.0
PX Deq: Join ACK 124 0 0 1 0.0
PX Deq: Parse Reply 124 0 0 0 0.0
KSV master wait 256 0 0 0 0.0
Latch Miss Sources
-> only latches with sleeps are shown
-> ordered by name, sleeps desc
NoWait Waiter
Latch Name Where Misses Sleeps Sleeps
ASM map operation freeli kffmTranslate2 0 2 0
DML lock allocation ktadmc 0 2 0
FOB s.o list latch ksfd_allfob 0 2 2
In memory undo latch ktiFlushMe 0 5 0
In memory undo latch ktichg: child 0 3 0
PC and Classifier lists No latch 0 6 0
Real-time plan statistic keswxAddNewPlanEntry 0 20 20
SQL memory manager worka qesmmIRegisterWorkArea:1 0 1 1
active service list kswslogon: session logout 0 23 12
active service list kswssetsvc: PX session swi 0 6 1
active service list kswsite: service iterator 0 1 0
archive process latch kcrrgpll 0 3 3
cache buffers chains kcbgtcr_2 0 1,746 573
cache buffers chains kcbgtcr: fast path (cr pin 0 1,024 2,126
cache buffers chains kcbgcur_2 0 60 8
cache buffers chains kcbchg1: kslbegin: bufs no 0 16 3
cache buffers chains kcbgtcr: fast path 0 14 20
cache buffers chains kcbzibmlt: multi-block rea 0 10 0
cache buffers chains kcbrls_2 0 9 53
cache buffers chains kcbgtcr: kslbegin shared 0 8 1
cache buffers chains kcbrls_1 0 7 84
cache buffers chains kcbgtcr: kslbegin excl 0 6 14
cache buffers chains kcbnew: new latch again 0 6 0
cache buffers chains kcbzgb: scan from tail. no 0 6 0
cache buffers chains kcbzwb 0 5 8
cache buffers chains kcbgcur: fast path (shr) 0 3 0
cache buffers chains kcbget: pin buffer 0 3 0
cache buffers chains kcbzhngcbk2_1 0 1 0
cache buffers lru chain kcbzgws 0 19 0
cache buffers lru chain kcbo_link_q 0 3 0
call allocation ksuxds 0 14 10
call allocation ksudlp: top call 0 2 3
enqueue hash chains ksqgtl3 0 2 1
enqueue hash chains ksqrcl 0 1 2
enqueues ksqgel: create enqueue 0 1 0
object queue header oper kcbo_unlink_q 0 5 2
object queue header oper kcbo_sw_buf 0 2 0
object queue header oper kcbo_link_q 0 1 2
object queue header oper kcbo_switch_cq 0 1 2
object queue header oper kcbo_switch_mq_bg 0 1 4
parallel query alloc buf kxfpbalo 0 1 1
process allocation ksucrp:1 0 2 0
process queue reference kxfpqrsnd 0 1 0
qmn task queue latch kwqmnmvtsks: delay to read 0 1 0
redo allocation kcrfw_redo_gen: redo alloc 0 17 0
row cache objects kqreqd: reget 0 6 0
row cache objects kqrpre: find obj 0 6 13
row cache objects kqrso 0 2 0
row cache objects kqreqd 0 1 2
row cache objects kqrpre: init complete 0 1 1
shared pool kghalo 0 199 106
shared pool kghupr1 0 39 109
shared pool kghfre 0 18 19
shared pool kghalp 0 7 29
space background task la ktsj_grab_task 0 21 27
Mutex Sleep Summary
-> ordered by number of sleeps desc
Wait
Mutex Type Location Sleeps Time (ms)
Library Cache kglhdgn2 106 338 12
Library Cache kgllkc1 57 259 10
Library Cache kgllkdl1 85 123 21
Cursor Pin kkslce [KKSCHLPIN2] 70 286
Library Cache kglget2 2 31 1
Library Cache kglhdgn1 62 31 2
Library Cache kglpin1 4 26 1
Library Cache kglpnal1 90 18 0
Library Cache kglpndl1 95 15 2
Library Cache kgllldl2 112 6 0
Library Cache kglini1 32 1 0
-------------------------------------------------------------Thanks in advance.Hi,
Thanks for reply.
I provided one hour report.
Inst Num Startup Time Release RAC
1 27-Feb-12 09:03 11.2.0.2.0 NO
Platform CPUs Cores Sockets Memory(GB)
Linux x86 64-bit 8 8 8 48.00
Snap Id Snap Time Sessions Curs/Sess
Begin Snap: 5606 29-Feb-12 04:00:35 63 3.7
End Snap: 5607 29-Feb-12 05:00:41 63 3.6
Elapsed: 60.11 (mins)
DB Time: 382.67 (mins)
Cache Sizes Begin End
~~~~~~~~~~~ ---------- ----------
Buffer Cache: 1,952M 1,952M Std Block Size: 16K
Shared Pool Size: 1,024M 1,024M Log Buffer: 18,868K
Load Profile Per Second Per Transaction Per Exec Per Call
~~~~~~~~~~~~ --------------- --------------- ---------- ----------
DB Time(s): 6.4 0.8 0.03 0.03
DB CPU(s): 1.0 0.1 0.00 0.00
Redo size: 84,539.3 10,425.6
Logical reads: 23,345.6 2,879.1
Block changes: 386.5 47.7
Physical reads: 1,605.0 197.9
Physical writes: 7.1 0.9
User calls: 233.9 28.9
Parses: 4.0 0.5
Hard parses: 0.1 0.0
W/A MB processed: 0.1 0.0
Logons: 0.1 0.0
Executes: 210.9 26.0
Rollbacks: 0.0 0.0
Transactions: 8.1
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 99.62 Redo NoWait %: 100.00
Buffer Hit %: 95.57 In-memory Sort %: 100.00
Library Hit %: 99.90 Soft Parse %: 98.68
Execute to Parse %: 98.10 Latch Hit %: 99.99
Parse CPU to Parse Elapsd %: 32.08 % Non-Parse CPU: 99.90
Shared Pool Statistics Begin End
Memory Usage %: 89.25 89.45
% SQL with executions>1: 96.79 97.52
% Memory for SQL w/exec>1: 95.67 96.56
Top 5 Timed Foreground Events
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Avg
wait % DB
Event Waits Time(s) (ms) time Wait Class
db file sequential read 3,054,464 17,002 6 74.0 User I/O
DB CPU 3,748 16.3
read by other session 199,603 796 4 3.5 User I/O
direct path read 46,301 439 9 1.9 User I/O
db file scattered read 21,113 269 13 1.2 User I/O
Host CPU (CPUs: 8 Cores: 8 Sockets: 8)
~~~~~~~~ Load Average
Begin End %User %System %WIO %Idle
1.45 1.67 13.2 0.6 15.8 86.2
Instance CPU
~~~~~~~~~~~~
% of total CPU for Instance: 13.0
% of busy CPU for Instance: 94.7
%DB time waiting for CPU - Resource Mgr: 0.0
Memory Statistics
~~~~~~~~~~~~~~~~~ Begin End
Host Mem (MB): 49,152.0 49,152.0
SGA use (MB): 3,072.0 3,072.0
PGA use (MB): 513.5 467.7
% Host Mem used for SGA+PGA: 7.29 7.20
Time Model Statistics
-> Total time in database user-calls (DB Time): 22960.5s
-> Statistics including the word "background" measure background process
time, and so do not contribute to the DB time statistic
-> Ordered by % or DB time desc, Statistic name
Statistic Name Time (s) % of DB Time
sql execute elapsed time 22,835.9 99.5
DB CPU 3,748.4 16.3
parse time elapsed 15.4 .1
hard parse elapsed time 14.3 .1
PL/SQL execution elapsed time 7.5 .0
PL/SQL compilation elapsed time 6.0 .0
connection management call elapsed time 1.6 .0
sequence load elapsed time 0.4 .0
hard parse (sharing criteria) elapsed time 0.0 .0
repeated bind elapsed time 0.0 .0
failed parse elapsed time 0.0 .0
DB time 22,960.5
background elapsed time 238.1
background cpu time 4.9
Operating System Statistics
-> *TIME statistic values are diffed.
All others display actual values. End Value is displayed if different
-> ordered by statistic type (CPU Use, Virtual Memory, Hardware Config), Name
Statistic Value End Value
BUSY_TIME 396,506
IDLE_TIME 2,483,725
IOWAIT_TIME 455,495
NICE_TIME 0
SYS_TIME 16,163
USER_TIME 380,052
LOAD 1 2
RSRC_MGR_CPU_WAIT_TIME 0
VM_IN_BYTES 95,646,943,232
VM_OUT_BYTES 1,686,059,008
PHYSICAL_MEMORY_BYTES 51,539,607,552
NUM_CPUS 8
NUM_CPU_CORES 8
NUM_CPU_SOCKETS 8
GLOBAL_RECEIVE_SIZE_MAX 4,194,304
GLOBAL_SEND_SIZE_MAX 1,048,586
TCP_RECEIVE_SIZE_DEFAULT 87,380
TCP_RECEIVE_SIZE_MAX 4,194,304
TCP_RECEIVE_SIZE_MIN 4,096
TCP_SEND_SIZE_DEFAULT 16,384
TCP_SEND_SIZE_MAX 4,194,304
TCP_SEND_SIZE_MIN 4,096
Operating System Statistics -
Snap Time Load %busy %user %sys %idle %iowait
29-Feb 04:00:35 1.4 N/A N/A N/A N/A N/A
29-Feb 05:00:41 1.7 13.8 13.2 0.6 86.2 15.8
Foreground Wait Class
-> s - second, ms - millisecond - 1000th of a second
-> ordered by wait time desc, waits desc
-> %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
-> Captured Time accounts for 97.6% of Total DB time 22,960.46 (s)
-> Total FG Wait Time: 18,651.75 (s) DB CPU time: 3,748.35 (s)
Avg
%Time Total Wait wait
Wait Class Waits -outs Time (s) (ms) %DB time
User I/O 3,327,253 0 18,576 6 80.9
DB CPU 3,748 16.3
Commit 23,882 0 69 3 0.3
System I/O 1,035 0 3 3 0.0
Network 842,393 0 2 0 0.0
Other 10,120 99 0 0 0.0
Configuration 3 0 0 58 0.0
Application 264 0 0 1 0.0
Concurrency 1,482 0 0 0 0.0
Foreground Wait Events
-> s - second, ms - millisecond - 1000th of a second
-> Only events with Total Wait Time (s) >= .001 are shown
-> ordered by wait time desc, waits desc (idle events last)
-> %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Avg
%Time Total Wait wait Waits % DB
Event Waits -outs Time (s) (ms) /txn time
db file sequential read 3,054,464 0 17,002 6 104.5 74.0
read by other session 199,603 0 796 4 6.8 3.5
direct path read 46,301 0 439 9 1.6 1.9
db file scattered read 21,113 0 269 13 0.7 1.2
log file sync 23,882 0 69 3 0.8 .3
db file parallel read 4,727 0 68 14 0.2 .3
control file sequential re 1,035 0 3 3 0.0 .0
SQL*Net message to client 840,792 0 2 0 28.8 .0
direct path read temp 95 0 2 18 0.0 .0
local write wait 79 0 0 4 0.0 .0
Disk file operations I/O 870 0 0 0 0.0 .0
ASM file metadata operatio 4 0 0 50 0.0 .0
log file switch (private s 3 0 0 58 0.0 .0
ADR block file read 36 0 0 3 0.0 .0
enq: RO - fast object reus 5 0 0 16 0.0 .0
latch: cache buffers chain 1,465 0 0 0 0.1 .0
SQL*Net break/reset to cli 256 0 0 0 0.0 .0
asynch descriptor resize 10,059 100 0 0 0.3 .0
SQL*Net more data to clien 1,510 0 0 0 0.1 .0
enq: KO - fast object chec 3 0 0 8 0.0 .0
SQL*Net more data from cli 91 0 0 0 0.0 .0
latch: shared pool 14 0 0 0 0.0 .0
ADR block file write 5 0 0 1 0.0 .0
reliable message 8 0 0 0 0.0 .0
direct path write temp 1 0 0 2 0.0 .0
SQL*Net message from clien 840,794 0 68,885 82 28.8
jobq slave wait 7,365 100 3,679 499 0.3
Streams AQ: waiting for me 721 100 3,605 5000 0.0
wait for unread message on 3,648 98 3,603 988 0.1
KSV master wait 20 0 0 0 0.0
Background Wait Events
-> ordered by wait time desc, waits desc (idle events last)
-> Only events with Total Wait Time (s) >= .001 are shown
-> %Timeouts: value of 0 indicates value was < .5%. Value of null is truly 0
Avg
%Time Total Wait wait Waits % bg
Event Waits -outs Time (s) (ms) /txn time
log file parallel write 29,353 0 83 3 1.0 34.8
db file parallel write 5,753 0 17 3 0.2 6.9
db file sequential read 1,638 0 15 9 0.1 6.1
control file sequential re 5,142 0 13 2 0.2 5.4
os thread startup 140 0 8 58 0.0 3.4
control file parallel writ 1,440 0 8 6 0.0 3.4
log file sequential read 304 0 8 26 0.0 3.3
db file scattered read 214 0 2 9 0.0 .8
ASM file metadata operatio 1,199 0 1 1 0.0 .3
direct path write 35 0 0 6 0.0 .1
direct path read 41 0 0 5 0.0 .1
kfk: async disk IO 6 0 0 9 0.0 .0
Disk file operations I/O 1,266 0 0 0 0.0 .0
ADR block file read 16 0 0 2 0.0 .0
read by other session 3 0 0 8 0.0 .0
Log archive I/O 2 0 0 10 0.0 .0
log file sync 3 0 0 5 0.0 .0
asynch descriptor resize 341 100 0 0 0.0 .0
CSS initialization 1 0 0 6 0.0 .0
log file single write 4 0 0 1 0.0 .0
latch: redo allocation 3 0 0 1 0.0 .0
ADR block file write 5 0 0 1 0.0 .0
LGWR wait for redo copy 45 0 0 0 0.0 .0
CSS operation: query 6 0 0 0 0.0 .0
CSS operation: action 1 0 0 1 0.0 .0
SQL*Net message to client 420 0 0 0 0.0 .0
rdbms ipc message 47,816 39 61,046 1277 1.6
DIAG idle wait 7,200 100 7,200 1000 0.2
Space Manager: slave idle 1,146 98 5,674 4951 0.0
class slave wait 284 0 3,983 14026 0.0
dispatcher timer 61 100 3,660 60006 0.0
Streams AQ: qmn coordinato 258 50 3,613 14003 0.0
Streams AQ: qmn slave idle 130 0 3,613 27789 0.0
Streams AQ: waiting for ti 7 71 3,608 515430 0.0
wait for unread message on 3,605 100 3,606 1000 0.1
pmon timer 1,201 100 3,604 3001 0.0
smon timer 15 73 3,603 240207 0.0
ASM background timer 754 0 3,602 4777 0.0
shared server idle wait 120 100 3,601 30006 0.0
SQL*Net message from clien 554 0 4 7 0.0
KSV master wait 101 0 0 2 0.0
Wait Event Histogram
-> Units for Total Waits column: K is 1000, M is 1000000, G is 1000000000
-> % of Waits: value of .0 indicates value was <.05%; value of null is truly 0
-> % of Waits: column heading of <=1s is truly <1024ms, >1s is truly >=1024ms
-> Ordered by Event (idle events last)
% of Waits
Total
Event Waits <1ms <2ms <4ms <8ms <16ms <32ms <=1s >1s
ADR block file read 52 73.1 1.9 9.6 13.5 1.9
ADR block file write 10 100.0
ADR file lock 12 100.0
ARCH wait for archivelog l 3 100.0
ASM file metadata operatio 1203 97.3 .5 .7 .3 .2 .9
CSS initialization 1 100.0
CSS operation: action 1 100.0
CSS operation: query 6 83.3 16.7
Disk file operations I/O 2118 95.4 4.5 .1
LGWR wait for redo copy 45 100.0
Log archive I/O 2 100.0
SQL*Net break/reset to cli 256 99.6 .4
SQL*Net message to client 839.9 100.0 .0
SQL*Net more data from cli 91 100.0
SQL*Net more data to clien 1503 100.0
asynch descriptor resize 10.4K 100.0
buffer busy waits 2 100.0
control file parallel writ 1440 5.7 35.1 24.0 16.3 12.0 5.5 1.5
control file sequential re 6177 69.4 7.5 5.9 8.1 7.1 1.7 .3
db file parallel read 4727 1.7 3.2 3.2 10.1 46.6 33.3 1.8
db file parallel write 5755 42.3 21.3 18.6 11.2 4.6 1.4 .5
db file scattered read 21.5K 8.4 4.3 11.9 18.9 26.3 25.3 4.9
db file sequential read 3053. 28.7 15.1 11.1 17.9 21.5 5.4 .3 .0
direct path read 46.3K 9.9 8.8 18.5 21.7 22.8 15.7 2.7
direct path read temp 95 9.5 9.5 23.2 49.5 8.4
direct path write 35 11.4 31.4 17.1 22.9 11.4 2.9 2.9
direct path write temp 1 100.0
enq: KO - fast object chec 3 66.7 33.3
enq: RO - fast object reus 5 20.0 20.0 20.0 20.0 20.0
kfk: async disk IO 6 50.0 16.7 16.7 16.7
latch free 3 100.0
latch: cache buffers chain 1465 100.0
latch: cache buffers lru c 1 100.0
latch: object queue header 2 100.0
latch: redo allocation 3 33.3 33.3 33.3
latch: row cache objects 2 100.0
latch: shared pool 15 93.3 6.7
local write wait 79 35.4 34.2 21.5 8.9
log file parallel write 29.4K 47.8 21.7 11.9 9.9 6.8 1.6 .3
log file sequential read 304 6.3 3.0 3.6 10.2 23.4 24.3 29.3
log file single write 4 25.0 75.0
log file switch (private s 3 100.0
log file sync 23.9K 40.9 28.0 12.9 9.7 6.7 1.5 .3
os thread startup 140 100.0
read by other session 199.6 37.1 19.9 12.9 13.1 13.8 3.1 .2
reliable message 8 100.0
ASM background timer 755 2.9 .4 .1 .1 .3 .1 .3 95.8
DIAG idle wait 7196 100.0
KSV master wait 121 88.4 2.5 3.3 2.5 .8 .8 1.7
SQL*Net message from clien 840.1 97.1 1.8 .5 .2 .2 .1 .0 .1
Space Manager: slave idle 1147 .1 .5 99.4
Streams AQ: qmn coordinato 258 49.6 .4 50.0
Streams AQ: qmn slave idle 130 .8 99.2
Streams AQ: waiting for me 721 100.0
Streams AQ: waiting for ti 7 28.6 42.9 28.6
class slave wait 283 39.9 2.5 2.5 3.5 4.9 9.2 15.2 22.3
dispatcher timer 60 100.0
jobq slave wait 7360 .0 .0 .0 99.9
pmon timer 1201 100.0
rdbms ipc message 47.8K 2.7 31.6 17.4 1.1 1.1 .9 20.9 24.3
Wait Event Histogram DB/Inst: I2KPROD/I2KPROD Snaps: 5606-5607
-> Units for Total Waits column: K is 1000, M is 1000000, G is 1000000000
-> % of Waits: value of .0 indicates value was <.05%; value of null is truly 0
-> % of Waits: column heading of <=1s is truly <1024ms, >1s is truly >=1024ms
-> Ordered by Event (idle events last)
% of Waits
Total
Event Waits <1ms <2ms <4ms <8ms <16ms <32ms <=1s >1s
shared server idle wait 120 100.0
smon timer 16 6.3 93.8
wait for unread message on 7250 .1 99.9
Latch Miss Sources
-> only latches with sleeps are shown
-> ordered by name, sleeps desc
NoWait Waiter
Latch Name Where Misses Sleeps Sleeps
In memory undo latch ktichg: child 0 1 0
active service list kswslogon: session logout 0 2 0
cache buffers chains kcbgtcr_2 0 1,123 483
cache buffers chains kcbgtcr: fast path (cr pin 0 496 1,131
cache buffers chains kcbrls_2 0 5 6
cache buffers chains kcbgcur_2 0 4 0
cache buffers chains kcbgtcr: fast path 0 3 1
cache buffers chains kcbzwb 0 2 4
cache buffers chains kcbchg1: kslbegin: bufs no 0 1 0
cache buffers chains kcbnew: new latch again 0 1 0
cache buffers chains kcbrls_1 0 1 6
cache buffers chains kcbzgb: scan from tail. no 0 1 0
cache buffers lru chain kcbzgws 0 1 0
object queue header oper kcbo_switch_cq 0 1 0
object queue header oper kcbo_switch_mq_bg 0 1 2
redo allocation kcrfw_redo_gen: redo alloc 0 3 0
row cache objects kqrpre: find obj 0 1 1
row cache objects kqrso 0 1 0
shared pool kghalo 0 13 3
shared pool kghupr1 0 4 15
shared pool kghalp 0 1 0
space background task la ktsj_grab_task 0 2 2
------------------------------------------------------------- -
Issue with "read by other session" and a parallel MERGE query
Hi everyone,
we have run into an issue with a batch process updating a large table (12 million rows / a few GB, so it's not that large). The process is quite simple - load the 'increment' from a file into a working table (INCREMENT_TABLE) and apply it to the main table using a MERGE. The increment is rather small (usually less than 10k rows), but the MERGE runs for hours (literally) although the execution plan seems quite reasonable (can post it tomorrow, if needed).
The first thing we've checked is AWR report, and we've noticed this:
Top 5 Timed Foreground Events
Event Waits Time(s) Avg wait (ms) % DB time Wait Class
DB CPU 10,086 43.82
read by other session 3,968,673 9,179 2 39.88 User I/O
db file scattered read 1,058,889 2,307 2 10.02 User I/O
db file sequential read 408,499 600 1 2.61 User I/O
direct path read 132,430 459 3 1.99 User I/OSo obviously most of the time was consumed by "read by other session" wait event. There were no other queries running at the server, so in this case "other session" actually means "parallel processes" used to execute the same query. The main table (the one that's updated by the batch process) has "PARALLEL DEGREE 4" so Oracle spawns 4 processes.
I'm not sure how to fix this. I've read a lot of details about "read by other session" but I'm not sure it's the root cause - in the end, when two processes read the same block, it's quite natural that only one does the physical I/O while the other waits. What really seems suspicious is the number of waits - 4 million waits means 4 million blocks, 8kB each. That's about 32GB - the table has about 4GB, and there are less than 10k rows updated. So 32 GB is a bit overkill (OK, there are indexes etc. but still, that's 8x the size of the table).
So I'm thinking that the buffer cache is too small - one process reads the data into cache, then it's removed and read again. And again ...
One of the recommendations I've read was to increase the PCTFREE, to eliminate 'hot blocks' - but wouldn't that make the problem even worse (more blocks to read and keep in the cache)? Or am I completely wrong?
The database is 11gR2, the buffer cache is about 4GB. The storage is a SAN (but I don't think this is the bottleneck - according to the iostat results it performs much better in case of other batch jobs).OK, so a bit more details - we've managed to significantly decrease the estimated cost and runtime. All we had to do was a small change in the SQL - instead of
MERGE /*+ parallel(D DEFAULT)*/ INTO T_NOTUNIFIED_CLIENT D /*+ append */
USING (SELECT
FROM TMP_SODW_BB) S
ON (D.NCLIENT_KEY = S.NCLIENT_KEY AND D.CURRENT_RECORD = 'Y' AND S.DIFF_FLAG IN ('U', 'D'))
...(which is the query listed above) we have done this
MERGE /*+ parallel(D DEFAULT)*/ INTO T_NOTUNIFIED_CLIENT D /*+ append */
USING (SELECT
FROM TMP_SODW_BB AND DIFF_FLAG IN ('U', 'D')) S
ON (D.NCLIENT_KEY = S.NCLIENT_KEY AND D.CURRENT_RECORD = 'Y')
...i.e. we have moved the condition from the MERGE ON clause to the SELECT. And suddenly, the execution plan is this
OPERATION OBJECT_NAME OPTIONS COST
MERGE STATEMENT 239
MERGE T_NOTUNIFIED_CLIENT
PX COORDINATOR
PX SEND :TQ10000 QC (RANDOM) 239
VIEW
NESTED LOOPS OUTER 239
PX BLOCK ITERATOR
TABLE ACCESS TMP_SODW_BB FULL 2
Filter Predicates
OR
DIFF_FLAG='D'
DIFF_FLAG='U'
TABLE ACCESS T_NOTUNIFIED_CLIENT BY INDEX ROWID 3
INDEX AK_UQ_NOTUNIF_T_NOTUNI RANGE SCAN 2
Access Predicates
AND
D.NCLIENT_KEY(+)=NCLIENT_KEY
D.CURRENT_RECORD(+)='Y'
Filter Predicates
D.CURRENT_RECORD(+)='Y' Yes, I know the queries are not exactly the same - but we can fix that. The point is that the TMP_SODW_BB table contains 1639 rows in total, and 284 of them match the moved 'IN' condition. Even if we remove the condition altogether (i.e. 1639 rows have to be merged), the execution plan does not change (the cost increases to about 1300, which is proportional to the number of rows).
But with the original IN condition (that turns into an OR combination of predicates) in the MERGE ON clausule, the cost suddenly skyrockets to 990.000 and it's damn slow. It seems like a problem with cost estimation, because once we remove one of the values (so there's only one value in the IN clausule), it works fine again. So I guess it's a planner/estimator issue ... -
Hi all,
I have a query with very little cost, it only access one row of the table from a primary key and joins it another table again on primary key column. It doesn't even take a second to complete.
But the problem is when there is another session that accesses data from one of the tables, I encounter "read by other session" wait event, so I wonder if there is a hint to overcome this wait, that will force query to make a disk read without waiting any other working session to put it into buffer cache. Or any other suggestions?
Thanksseth2 wrote:
Hi all,
I have a query with very little cost, it only access one row of the table from a primary key and joins it another table again on primary key column. It doesn't even take a second to complete.
You also say in a later post that the cost of the plan is 11 - if this is correct then your two indexes must have a blevel of about 5 to get that cost from that plan. It seems highly likely that your query doesn't always take the plan you expect and that the "10 minute" versions of this query (which should take less than 0.1 seconds on any reasonable system) is doing a large tablescan to spend so much extra time and report "read by other session". I would check v$sql for multiple child cursors and v$sql_plan (using dbms_xplan.display_cursor if you're on 10g) to check executions plans.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
"Science is more than a body of knowledge; it is a way of thinking"
Carl Sagan -
Hi
Please help. The situation is that we found the Read By Other Sessions Event occurs and the sessions hang for a week. No new Sessions ID suffers from ths events and Just keep 10 Sessions ID with this event waiting. Our user didn't suffer any performance problem so far.
Our Application layer is Web-based, I believe users related to those sessions are disconnected already. So How come those session ID waits so long !!!!
Thx
KitOur DBA helped me to get the information from the V$Session. Let Session ID = 123. We found that this session has Read by Other Session" event from 17-May up to now every 10 seconds.
DBA gives me the following fields to study
Time
INSTANCE_NUMBER
SESSION_ID
DB User
EVENT_NAME
CURRENT_OBJ#
CURRENT_FILE#
CURRENT_BLOCK#
SEQ#
EVENT_ID P1 P2 P3
WAIT_TIME TIME_WAITED SQL_ID SQL_TEXT -
Read by other session wait event
I have some reports in my database that whenever executed by two or more session these reports suffers with read by other session wait event. Tables which are involving in that's query i moves them to other tablespace and then move back to original tablespace. Some how this could solves read by other session wait event. But after some days these problem occur again.
How can i permanently solve this problem??
My db is Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
Oracle Block size 4096
ThanksHi there,
Searching for this wait eventin the docs gave this,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/waitevents003.htm#sthref3159
read by other session
This event occurs when a session requests a buffer that is currently being read into the buffer cache by another session. Prior to release 10.1, waits for this event were grouped with the other reasons for waiting for buffers under the 'buffer busy wait' event
Wait Time: Time waited for the buffer to be read by the other session (in microseconds)And a quick google search for the same gave these results in the top.
http://www.confio.com/English/Tips/Read_By_Other_Session.php
http://www.dbafan.com/blog/?p=132
HTH
Aman.... -
Question: how to read winmail.dat attachments from others
Based on a recommendation from an AppleCare rep, I downloaded "TNEF's Enough" so I could read winmail.dat attachments from others. It won't work and when I called again, I was told AppleCare doesn't support third party apps. How do I activate it? I tried double clicking on it and nothing happened.
http://www.joshjacob.com/mac-development/tnef.php
-
DBA commit other session's transaction?
Hi, everyone,
A quick question, can a DBA commit {color:#0000ff}other session's transaction{color}?
If so, how?
Thanks!
AlexTransactions can be as long as what the user logic demands. There is no transactions that is too long or too large. Oracle doesn't break, slowdown, or underperform because of long or big transactions. If you look deep into how oracle handles transactions in the background, you'll see why.
It's interesting you mentioned that. I hope you really looked deep into how oracle handles transactions so you can en-light us how long and large transaction not affecting performance.
perhaps we should start with Oracle Concept shall we?
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/transact.htm#CNCPT117
In a nutshell long and large transaction has potential performance impact at least in these aspects.
A transaction will generate undo information, until the transaction is committed, these undo segment can't be reused. As transaction grows the undo space held hostage grows. Potential performance impact No.1
A transaction usually hold locks on rows you made changes. until your transaction is committed, no other user can update these rows and need to wait for the lock. Potential performance impact No.2
The third one is situation like yours, when a session held long and big transaction dropped, Oracle need to rollback all the changes made to database. Some of these changes already been flushed to disk (especially since it's long and large transaction). In that case, Oracle will need to load all changed data blocks and apply undo information back.
On the other hand, since you are seeking ways for DBA to commit the uncommit change you made recklessly, that means you could have committed the changes. There's certainly no user logic to hold these changes as one single transaction. -
How do I read uncommitted records of another session
HI
How do I read uncommitted records from another session in Oracle
Thanks
AshwinAshwin,
Oh I might as well add my thoughts on this as it is kinda an important subject. I'm sort of a different kind of programmer where there have been several times I have wanted to see the changed results that another session is doing. I agree that the rest of the sessions should not be able to SEE the changes until they are committed. HOWEVER, as some examples show below, I don't see why a custom package can't be developed to allow a different session to be able to query the changed data for a particular SID, or even begin issuing DML commands of their own on this changed data to help change it further.
In reality, there is no reason why a single (and I emphasize single) session is the only one who can see the changed data. It's the other user sessions that really should wait until all the necessary changes are complete before others can see the changed information. There isn't much point in me trying to explain this in great detail, but overall YES other users should wait until the changes are committed, but NO I do think I should be able to connect to another SIDs sessions and be able to view/perform operations on this changed data.
There are more than enough examples of why others should wait before changes are committed (which I agree), but as some of these real life examples point out, there is a need to let more than a single session perform such changes, each of which need to see each other's changed data.
No I am no expert on transaction processing (Andrew knows more for sure), but I've done enough to know as a developer I have a number of times wanted to be able to access/monitor another sessions uncommitted data. I think some records might be viewable using committed AUTONOMOUS_TRANSACTION records, but I've yet to really try it out much.
Examples where one wants to see others uncommitted data
(+) Say I want to change a hundred / thousand / million tables for a task. Each of these tables require joins/lookups to see each others data (including the changed records). I'm not going to want to do this with one session. Why can't 10 or a 100 sessions be created to allow complex DML operations to be performed to accomplish a given task. It's like thinking of there is 1 session doing this task, but on the oracle side, there are a unlimited number of SIDs processing (100 sqlplus scripts running), all being able to see the uncommitted data. Once everything is done, then the rest of the sessions can see this information.
(+) A process is running and is changing records, and I want to monitor its progress or even assist it it's getting behind.
(+) A real life example I just remembered was a soccer game done overseas where a time zone problem allowed people to still be able to place bets even after the game was over (they still paid people even though they knew the final score which was nice of them). In this case yes a process should have been stopped from allowing bets/inserts to continued, but having a second (or more) processes being able to KNOW for certain that another session is inserting data when it shouldn't be, this is can be stopped. And yes once again you can say one can monitor the sga for the appearance of inserts and stop it and yes remove the insert privs from that user after a certain time (come to think of it that wouldn't have worked since the time was off). But yes a whole slue of other things could have been done to stop this process from recording this information. However, NOT being able to select data from that table where the inserts were going into, until its toooooooooo late, is a real problem. Being able to see uncommitted information is very important if it needs to be stopped.
Overall I do think there should be something considered to allow to a session to be able to see what data another session is doing, but it's more on the side from administration of the data and the performance required to get a task done, even if it means sharing uncommitted changes between sessions.
Tyler D. -
Tables stored in memory but may be accessed from other sessions
Dear Oracle experts,
it may be a stupid question but I'm searching for the best possibility to create a kind of temporary table which may be accessed from other sessions.
Could you provide some hints/ catchwords to speed up my recherches.
Thank you very much,
Danieldanielwetzler wrote:
danielwetzler wrote:
I fear that the caching is not suitable for my case because of the reasons decribed in my other postings...First of all I don't think that you need to worry about the effectiveness of the caching in your particular case. In addition Oracle is very clever at when to actually write the dirty blocks from the buffer cache to the disks, so if your amount of data written to the result table is fairly small and no other activity is going on your system it won't get written to disk immediately anyway but stay in memory until any of the conditions are met that trigger the database writer to flush the blocks to disk.
But there are options you could consider if you want to avoid as much of the overhead as possible and to write the results of your calculation to the result table as fast as possible.
You could use direct-path inserts (INSERT /*+ APPEND */) and set the result table to "NOLOGGING". This way no undo and minimum redo is generated.
Note however that there are certain caveats and restrictions to consider when using such an approach, e.g. your result table won't be recoverable (which you say is OK), only one direct-path insert is allowed simultaneously (it blocks the table exclusively, no other DML possible until you commit/rollback the transaction), and the direct-path insert has some restrictions. If any of these apply that prevent the direct-path operation then it silently falls back to "conventional" insert mode which generates undo and redo. One of the more annoying restrictions is that you can't read from a table that has been written to in direct-path mode within the same transaction, you first have to commit the transaction, otherwise you get "ORA-12838: cannot read/modify an object after modifying it in parallel". This means by simply adding the APPEND hint you might break existing logic.
Finally the direct-path insert never re-uses free space in blocks below the current high-water mark, which means if you perform a direct-path insert and afterwards delete rows from the table and repeat again a direct-path insert operation your segment will grow and the empty space in the already used blocks won't get re-used. Best way would be to truncate the table rather than deleting rows from it.
There are workarounds available to overcome some of these direct-path insert limitations (exclusive lock, truncate instead of delete etc.), like using a partitioned table (if you have a suitable edition/license), because direct-path inserts can be restricted to partitions. In this case you can do simultaneous direct-path inserts if you use different partitions, but you need then some kind of logic that determines which partition to use.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/ -
LOV does not show newly added data in the same session
Hi guys,
I work with JDeveloper 11g Release 2. We use Oracle ADF to develop our web app.
In a page we have a LOV (say the page name is "a"). The related data for that LOV is inserted to the db in another page ( say the page name is "b").
When new data is added in the page "b" and goes directly to the page "a" the LOV does not show newly added data. But if the user log out and log in again
LOV shows newly added data correctly.
Is there a way to show the newly added data in the same session without logging out? Please help.
Regards !
Sameera.Add the following method in your ViewRowImpl base class:
public void refreshLOVAccessorQueries() {
List lovs = getViewDef().getListBindingDefs();
if (lovs != null) {
for (Object obj : lovs) {
getListBindingRSI((ListBindingDef)obj).getRowSet().executeQuery();
ListBindingDef lbd = (ListBindingDef)obj;
Export that method to the Row Client interface, add him to the pageDef, and invoke in the executables section of the pageDef:
<executables>
<invokeAction Binds="refreshLOVAccessorQueries" id="callRefreshLOVs"
RefreshCondition="#{!requestContext.postback and empty bindings.exceptionList}"/>
</executables> -
Problem trying read data from Destination
HI,
I have confiigured ADS and when im testing dest im getting the error :error while silently connecting:org.w3c.www.protocol :connection refused.
when i ckedth NWA logs i got the below trace file. please let me know how to solve this.
Problem trying read data from Destination: dest:FP_ICF_DATA_K64//sap/bc/fp/form/layout/FP_FORM_SECURITY_TEST.XDP?fp-language=DE
com.adobe.ads.destination.DestinationException: IO error detected while opening DEST connection: http://sapk64.essent.local:8062/sap/bc/fp/form/layout/FP_FORM_SECURITY_TEST.XDP?fp-language=DE
at com.adobe.ads.destination.Destination.readUrlStream(Unknown Source)
at com.adobe.ads.destination.Destination.readTemplate(Unknown Source)
at com.adobe.ads.data.DestURLData.setData(Unknown Source)
at com.adobe.ads.data.DestURLData.<init>(Unknown Source)
at com.adobe.ads.data.PDFData.createFromURL(Unknown Source)
at com.adobe.ads.data.PDFData.create(Unknown Source)
at com.adobe.ads.request.Template.setPDFData(Unknown Source)
at com.adobe.ads.request.Template.initialize(Unknown Source)
at com.adobe.ads.request.Renderer.initializeTemplates(Unknown Source)
at com.adobe.ads.request.Renderer.execute(Unknown Source)
at com.adobe.BaseADSRequest.doWork(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.processRender(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.execute(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.processRequest(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.rpData(Unknown Source)
at com.adobe.AdobeDocumentServicesLocalLocalObjectImpl0_0.rpData(AdobeDocumentServicesLocalLocalObjectImpl0_0.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at com.sap.engine.services.webservices.runtime.EJBImplementationContainer.invokeMethod(EJBImplementationContainer.java:126)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:157)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:79)
at com.sap.engine.services.webservices.runtime.servlet.ServletDispatcherImpl.doPost(ServletDispatcherImpl.java:92)
at SoapServlet.doPost(SoapServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(AccessController.java:207)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
Caused by: org.w3c.www.protocol.http.HttpException: java.net.ConnectException: Connection refused
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:354)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:219)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:206)
at java.net.Socket.connect(Socket.java:483)
at java.net.Socket.connect(Socket.java:433)
at java.net.Socket.<init>(Socket.java:340)
at java.net.Socket.<init>(Socket.java:180)
at org.w3c.www.protocol.http.f.a(Unknown Source)
at org.w3c.www.protocol.http.f.markUsed(Unknown Source)
at org.w3c.www.protocol.http.HttpBasicServer.getConnection(Unknown Source)
at org.w3c.www.protocol.http.HttpBasicServer.runRequest(Unknown Source)
at org.w3c.www.protocol.http.HttpManager.runRequest(Unknown Source)
at org.w3c.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at org.w3c.www.protocol.http.HttpURLConnection.a(Unknown Source)
at org.w3c.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at com.adobe.ads.destination.Destination.readUrlStream(Unknown Source)
at com.adobe.ads.destination.Destination.readTemplate(Unknown Source)
at com.adobe.ads.data.DestURLData.setData(Unknown Source)
at com.adobe.ads.data.DestURLData.<init>(Unknown Source)
at com.adobe.ads.data.PDFData.createFromURL(Unknown Source)
at com.adobe.ads.data.PDFData.create(Unknown Source)
at com.adobe.ads.request.Template.setPDFData(Unknown Source)
at com.adobe.ads.request.Template.initialize(Unknown Source)
at com.adobe.ads.request.Renderer.initializeTemplates(Unknown Source)
at com.adobe.ads.request.Renderer.execute(Unknown Source)
at com.adobe.BaseADSRequest.doWork(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.processRender(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.execute(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.processRequest(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.rpData(Unknown Source)
at com.adobe.AdobeDocumentServicesLocalLocalObjectImpl0_0.rpData(AdobeDocumentServicesLocalLocalObjectImpl0_0.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at com.sap.engine.services.webservices.runtime.EJBImplementationContainer.invokeMethod(EJBImplementationContainer.java:126)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:157)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:79)
at com.sap.engine.services.webservices.runtime.servlet.ServletDispatcherImpl.doPost(ServletDispatcherImpl.java:92)
at SoapServlet.doPost(SoapServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(AccessController.java:207)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
Error embedding request inputs in error log.
Error embedding request inputs in error log.
java.lang.NullPointerException
at com.adobe.ads.request.Renderer.embedInputs(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.processRenderLog(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.processRender(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.execute(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.processRequest(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.rpData(Unknown Source)
at com.adobe.AdobeDocumentServicesLocalLocalObjectImpl0_0.rpData(AdobeDocumentServicesLocalLocalObjectImpl0_0.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at com.sap.engine.services.webservices.runtime.EJBImplementationContainer.invokeMethod(EJBImplementationContainer.java:126)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:157)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:79)
at com.sap.engine.services.webservices.runtime.servlet.ServletDispatcherImpl.doPost(ServletDispatcherImpl.java:92)
at SoapServlet.doPost(SoapServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(AccessController.java:207)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
No output was generated while rendering
The render error log file has been written to /usr/sap/T50/SYS/global/AdobeDocumentServices/renderErrorLog/errorFiles/2008.08.05.113021ADS_AGENT.pdf.
Please validate the input files or streams attached with it and try again
Processing exception during a "Render" operation.
Request start time: Tue Aug 05 11:30:21 CEST 2008
com.adobe.ads.destination.DestinationException: IO error detected while opening DEST connection: http://sapk64.essent.local:8062/sap/bc/fp/form/layout/FP_FORM_SECURITY_TEST.XDP?fp-language=DE; [Error Log file "2008.08.05.113021ADS_AGENT.pdf" written to /usr/sap/T50/SYS/global/AdobeDocumentServices/renderErrorLog/errorFiles]
Exception Stack Trace:
com.adobe.ads.destination.DestinationException: IO error detected while opening DEST connection: http://sapk64.essent.local:8062/sap/bc/fp/form/layout/FP_FORM_SECURITY_TEST.XDP?fp-language=DE
at com.adobe.ads.destination.Destination.readUrlStream(Unknown Source)
at com.adobe.ads.destination.Destination.readTemplate(Unknown Source)
at com.adobe.ads.data.DestURLData.setData(Unknown Source)
at com.adobe.ads.data.DestURLData.<init>(Unknown Source)
at com.adobe.ads.data.PDFData.createFromURL(Unknown Source)
at com.adobe.ads.data.PDFData.create(Unknown Source)
at com.adobe.ads.request.Template.setPDFData(Unknown Source)
at com.adobe.ads.request.Template.initialize(Unknown Source)
at com.adobe.ads.request.Renderer.initializeTemplates(Unknown Source)
at com.adobe.ads.request.Renderer.execute(Unknown Source)
at com.adobe.BaseADSRequest.doWork(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.processRender(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.execute(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.processRequest(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.rpData(Unknown Source)
at com.adobe.AdobeDocumentServicesLocalLocalObjectImpl0_0.rpData(AdobeDocumentServicesLocalLocalObjectImpl0_0.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at com.sap.engine.services.webservices.runtime.EJBImplementationContainer.invokeMethod(EJBImplementationContainer.java:126)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:157)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:79)
at com.sap.engine.services.webservices.runtime.servlet.ServletDispatcherImpl.doPost(ServletDispatcherImpl.java:92)
at SoapServlet.doPost(SoapServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(AccessController.java:207)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
Caused by: org.w3c.www.protocol.http.HttpException: java.net.ConnectException: Connection refused
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:354)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:219)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:206)
at java.net.Socket.connect(Socket.java:483)
at java.net.Socket.connect(Socket.java:433)
at java.net.Socket.<init>(Socket.java:340)
at java.net.Socket.<init>(Socket.java:180)
at org.w3c.www.protocol.http.f.a(Unknown Source)
at org.w3c.www.protocol.http.f.markUsed(Unknown Source)
at org.w3c.www.protocol.http.HttpBasicServer.getConnection(Unknown Source)
at org.w3c.www.protocol.http.HttpBasicServer.runRequest(Unknown Source)
at org.w3c.www.protocol.http.HttpManager.runRequest(Unknown Source)
at org.w3c.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at org.w3c.www.protocol.http.HttpURLConnection.a(Unknown Source)
at org.w3c.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at com.adobe.ads.destination.Destination.readUrlStream(Unknown Source)
at com.adobe.ads.destination.Destination.readTemplate(Unknown Source)
at com.adobe.ads.data.DestURLData.setData(Unknown Source)
at com.adobe.ads.data.DestURLData.<init>(Unknown Source)
at com.adobe.ads.data.PDFData.createFromURL(Unknown Source)
at com.adobe.ads.data.PDFData.create(Unknown Source)
at com.adobe.ads.request.Template.setPDFData(Unknown Source)
at com.adobe.ads.request.Template.initialize(Unknown Source)
at com.adobe.ads.request.Renderer.initializeTemplates(Unknown Source)
at com.adobe.ads.request.Renderer.execute(Unknown Source)
at com.adobe.BaseADSRequest.doWork(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.processRender(Unknown Source)
at com.adobe.AdobeDocumentServicesWorker.execute(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.processRequest(Unknown Source)
at com.adobe.AdobeDocumentServicesEJB.rpData(Unknown Source)
at com.adobe.AdobeDocumentServicesLocalLocalObjectImpl0_0.rpData(AdobeDocumentServicesLocalLocalObjectImpl0_0.java:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
at java.lang.reflect.Method.invoke(Method.java:391)
at com.sap.engine.services.webservices.runtime.EJBImplementationContainer.invokeMethod(EJBImplementationContainer.java:126)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:157)
at com.sap.engine.services.webservices.runtime.RuntimeProcessor.process(RuntimeProcessor.java:79)
at com.sap.engine.services.webservices.runtime.servlet.ServletDispatcherImpl.doPost(ServletDispatcherImpl.java:92)
at SoapServlet.doPost(SoapServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:365)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:944)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:266)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(AccessController.java:207)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)hi,
My problem is solved now. We have opened backend system port connection from portal side.
regards,
Krishna -
I would like to read data from files in EJBS (Stateless Session Bean I think). I've heard that the EJB sepcifications don't allow to use the java.io package to access the filesystem. How can I resolve this problem? Possible solutions I've thought of are:
* Use a webserver to store the data
* put the files in a jar and access them using the getResource() in the classloader class
Could you comment on this plesae
greetingsThe specification states:
"An enterprise bean must not use the java.io package to attempt to access files and directories in the file system.
The file system APIs are not well-suited for business components to access data. Business components should use a resource manager API, such as JDBC, to store data."
From this I understand I cannot acces files directly, but it does not specifiy I can't use the java.io package at all. It specifically says not to use the java.io package to acces files and directories, they don't say anything about using the classes for other use.
however, a litle lower the specification states:
"The enterprise bean must not attempt to create a class loader; obtain the current class loader; set the context class loader; set security manager; create a new security manager; stop the JVM; or change the input, output, and error streams.
These functions are reserved for the EJB Container. Allowing the enterprise bean to use these functions could compromise security and decrease the Container�s ability to properly manage the runtime environment."
I'm not sure how to interpret this, but I believe this rule makes my solution invalid.
Please comment on this,
thanks -
Storing Data in Application Module Session
I'd like to store information about the current user in the session of the application module. I've been examining the example in the ADF Guide for Forms Developers in Chapter 9, but would like to implement it in a more generic way, in an overridden ApplicationModuleImpl class similar to what is documented in Chapter 28.
What I'd like to accomplish is:
A generic setter method similar to:
public void setVariable(String name, String value) {
Hashtable userdata = getDBTransaction().getSession.getUserData();
if (userdata == null) {
userdata = new Hashtable();
userdata.put(name.toUpperCase(),value.toUpperCase());
and a getter method similar to
public String getVariable(String name) {
Hashtable userdata = getDBTransaction().getSession.getUserData();
//null handling omitted
return (userdata.get(name.toUpperCase()).toString());
I can test this with calls like:
setVariable("myName","myValue");
System.out.println("myName="+getVariable("myName"));
I don't get any errors, but the output is:
myName=
Apparently it isn't either storing the value, or it isn't retrieving it correctly. I have several questions about this:
1. What am I doing wrong here? It 'looks' like it should work, but isn't.
2. Is this an appropriate approach to this problem?
3. Will there need to be any special handling on passivation/activation? Or since it's data stored in the session, will the AM handle that for me?In further testing I can see that data is getting stored in my hashtable, and if I retrieve it directly in the setVariable method, the retrieval works. What I've discovered though, is that the code:
getDBTransaction().getSession.getUserData();
is returning null, in both the getter and setter methods. I am testing this using the application module tester (right click on the AM, click test). Is this default behavior, i.e. should the above line of code return a null value when using the tester?
Relatedly, am I going to have to write a front-end for this to test against? (please say it isn't so!)
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