Access method and wait event

hi,
i am confused about access method and wait event.
is there any relation between access method and wait event?

sb92075 wrote:
is there any relation between access method and wait event?No relationI disagree. If access method is full table scan or fast full index scan, that's likely to cause db file scattered read waits, whereas an index driven access method such as index range scan will likely cause db file sequential read waits.
-Mark

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Best Access Method and Estimated Performance

Dear folks,
I'm new to BDB. Although I have read all the documentation and the DS Presentation from Margo, I would like to ask your help to tunne my db layout.
I have to index 1 million key/data pairs in wich key is a logical number and data is 256 lenght (64 int array).
The size of the database is around 200MB. After the initial seed of data, the data will be READ ONLY. No need for concurrent access. One C program will acess the DB (single threaded).
I'm running on a Dual Xeon 3.2 GHz with 4 gb RAM.
I've choosen to use the QUEUE ACCESS METHOD (since I'm using logical numbers as key and a fixed data size).
I need to randomly access 140.000 keys in the DB.
As I've read from the documentation this would be accomplished in less than a second.
I would like to ask you what would be the expected retrieval time (number of keys/second) for my case (millions of 256 bytes data, with default configuration options) and if QUEUE is the best choice.
From my implementation test the c program takes a considerable amount of time the first time it queries (dpb->get) the database for 140.000 keys (is this the so called COLD START?). The successive times I run the program querying the DB with different 140.000 random keys it becames faster for each new run (is this because I'm warming up the cache?).
I'm using default configuration values for all tunning params: cache, mmapsize, etc...
Would it be possible to load the whole DB in memory before querying it with dpb->get? Would it make the 140.000 querying process faster?
I've tryied to iterate trough every record with a cursor and it takes around 5 seconds the first time and then gets faster on the successive runs. I've also tryied to iterate through every page to "warm up" the process before querying the 140.000 keys but did not have a great improvement.
My goal is to query 140.000 random keys from the DB as fastest as possible. (Be it changing by choosing a more appropriate access method, be it for tunning the config parameters).
I appreciate your help.
Maurice S.

Thank you Michael for your reply!!!
I've seen the thread regarding the strategy of openning the mpool file and iterating through the pages.
I've implemented that sucessfully (that reduced the total time required to perform the "get's" and also make this time a CONSTANT of around 0.5 seconds).
My implementation works the following way:
1) First I create the DB_ENV pointer
1.A) All my dbs are in a folder called "dbs". Therefore I call dbenv->set_data_dir appropriatelly
1.B) dbenv->set_mp_mmapsize(dbenv,300*1024*1024); (each DB has 183 MB)
1.C) I set the cache size to the smallest possible value dbenv->set_cachesize(dbenv, 0, 20 *1024, 0); [as I've read through the forum about similar cases]
1.D) Finally dbenv->open(dbenv, "db",DB_CREATE | DB_RDONLY| DB_INIT_MPOOL, 0))
2) Then I call the db (wich has 700.000 records; with for 4 bytes for each key, and 260 bytes for each data)
2.A) db_create(&dbs[c], dbenv, 0))
2.B) dbs[c]->set_re_len(dbs[c],260)
2.C) dbs[c]->set_pagesize(dbs[c], 64*1024))
2.D) dbs[c]->open(dbs[c],NULL, database, NULL, DB_QUEUE, DB_RDONLY, 0664))
Then I do the "mpool file iteration":
.....all the code from that thread.....
DB_MPOOLFILE* mfp =NULL;
mfp = dbs[c]->get_mpf(dbs[c]);
db_pgno_t lastPageNum;
void* pageAddr;
mfp->get(mfp, &lastPageNum, NULL, DB_MPOOL_LAST, &pageAddr);
mfp->put(mfp, pageAddr, DB_PRIORITY_UNCHANGED, 0);
db_pgno_t pageNum=0;
for(pageNum=0; pageNum<=lastPageNum; pageNum++)
mfp->get(mfp,&pageNum, NULL, 0, &pageAddr);
mfp->put(mfp,pageAddr, DB_PRIORITY_UNCHANGED,0);
And then I get 140.000 random records:
DBT key, data;
for(k=0;k<140000;k++)
db_recno_t recno=rand()%700000;
memset(&key, 0, sizeof(DBT));
memset(&data, 0, sizeof(DBT));
key.data = &recno;
key.size = sizeof(recno);
int dc[65];
data.data = dc;
data.ulen = sizeof(dc);
data.flags = DB_DBT_USERMEM;
dbp->get(dbp, NULL, &key, &data, 0);
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Changing the code above in order to use another one of the 20 DB's results in the same EXECUTION TIME (around 0.5 seconds).
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Is there any other parameters I could tunne to improve performace?
Would BTREE acess method perform better ? (I could index the record numbers as strings: "00000001", "00000002", ..... )
I do appreciate your attention.
Hope my post can be a source for help to other BDB users, as the forum has been to me.
Best rgs,
Maurice S.

RE: Looking for some database statistics and wait event statistics

Hi:
We are using Oracle 10g RAC on Sun Solaris 5.9.
1) In GV$SYSSTAT, we cannot find the following database statistics:
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     'global cache gets',
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2) In GV$SYSTEM_EVENT, we cannot find the following wait event:
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Have these stats been removed in Oracle 10g?
Have they been renamed? To what?
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Thanks

Hi:
We are using Oracle 10g RAC on Sun Solaris 5.9.
1) In GV$SYSSTAT, we cannot find the following database statistics:
     'global cache converts',
     'global cache convert time',
     'global cache gets',
     'global cache get time',
     'global cache convert timeouts',
     'global cache defers'
2) In GV$SYSTEM_EVENT, we cannot find the following wait event:
     'buffer busy global CR'
For 1) and 2), could you please tell us where to retrieve the above information,
or suggest a reasonable alternative?
Have these stats been removed in Oracle 10g?
Have they been renamed? To what?
3) We currently compute the number of additional redo logs that can be accommodated in the free space of the archive directory using the formula:
(arhive directory free space / redo log file size)
However, using ASM we find that the free space for a ASM diskgroup is being reported as zero in the table v$asm_diskgroup if the diskgroup is mounted manually. How would one go about retrieving the free space for a logical volume?
Thanks

Berkeley DB about hash Access Methods

When I use Berkeley DB with hash Access Methods, and the recored is very large, I want to know:
for examle when i insert two recored
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is the Berkeley DB cover the key1,data1 with key2,date2 ?, if so, i think it is a terrible things.
thanks for any reply, waiting......

You are very welcome, thanks again,
but now i find the Berkeley DB working are very slowly when the Database size grow up to more than 2GB, below is the list of my computer information:
OS: windows server 2003
API: C language
memory: 1GB
CPU: intel 820
database Access Methods: hash
key and dada: key is always char[32], data is always int32
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Sorry about mix the two problems. Let me make it clearly :
1 .Create an Environment contains an empty DB_HEAP database file with the code below.
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#include<iostream>
#include<cstring>
#include<cstdlib>
#include"db_cxx.h"
int main()
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u_int32_t db_flags = DB_CREATE | DB_AUTO_COMMIT;
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myEnv.close(0);
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std::cerr<<"error when closing environment and database: "<<filename<<","<<fileHome<<std::endl;
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RAC specific Wait events in AWR

DB version: 10.2.0.4
OS : Solaris x86
What are the most frequent RAC specific Wait events that appear in AWR reports ?

Hi Pete,
This depends on your environment. You can identify them as follows:
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http://download.oracle.com/docs/cd/E11882_01/rac.112/e16795/monitor.htm#i1010220
ASH Report for Oracle RAC: Top Cluster Events
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http://download.oracle.com/docs/cd/E11882_01/rac.112/e16795/monitor.htm
Regards,
Levi Pereira
Please close your thread when you get the solution to your problem. 
Mark the replies answered "helpful" answer and/or "correct" answer that will help others with same problem. 
Thanks for doing your part to make this community as valuable as possible for everyone!

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Hi all,
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thanks in advance
pradeep

If you don't have a GUI application then no events will be generated.
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http://java.sun.com/docs/books/tutorial/uiswing/events/keylistener.html

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EXECUTIONS PARSE_CALLS
SQL_TEXT
93380 93380
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read by other session 1,532,282 0 8,984 6 3.8
db file sequential read 4,514,494 0 5,588 1 11.2
latch: cache buffers lru chain 277,245 0 4,823 17 0.7
latch free 121,466 0 3,291 27 0.3
----------------------------------------------------------------------------------------------------

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~~~~~~~~ ----------- ------------ -------- --------------- ----------- ---
700000XXX XXX 1 22-Apr-15 12:12 11.2.0.4.0 NO
Host Name Platform CPUs Cores Sockets Memory (G)
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W/A MB processed: 1.7 0.0
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Instance Efficiency Indicators
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Shared Pool Statistics Begin End
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% Memory for SQL w/exec>1: 70.22 81.96
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CPU time 847 50.2
enq: TX - row lock contention 4,480 434 97 25.8
log file sync 284,169 185 1 11.0
log file parallel write 299,537 164 1 9.7
log file sequential read 698 16 24 1.0
Host CPU (CPUs: 2 Cores: 1 Sockets: 0)
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Instance CPU
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 Host: Busy CPU time (s): 2,430.7
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Memory Statistics Begin End
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log file sync 284,167 0 185 1 1.5 11.0
Disk file operations I/O 8,741 0 4 0 0.0 .2
direct path write 13,247 0 3 0 0.1 .2
db file sequential read 6,058 0 1 0 0.0 .1
buffer busy waits 1,800 0 1 1 0.0 .1
SQL*Net more data to client 29,161 0 1 0 0.2 .1
direct path read 7,696 0 1 0 0.0 .0
db file scattered read 316 0 1 2 0.0 .0
latch: shared pool 144 0 0 2 0.0 .0
CSS initialization 30 0 0 3 0.0 .0
cursor: pin S 10 0 0 9 0.0 .0
row cache lock 41 0 0 2 0.0 .0
latch: row cache objects 19 0 0 3 0.0 .0
log file switch (private str 8 0 0 7 0.0 .0
library cache: mutex X 28 0 0 2 0.0 .0
latch: cache buffers chains 54 0 0 1 0.0 .0
latch free 290 0 0 0 0.0 .0
control file sequential read 1,568 0 0 0 0.0 .0
log file switch (checkpoint 4 0 0 6 0.0 .0
direct path sync 8 0 0 3 0.0 .0
latch: redo allocation 60 0 0 0 0.0 .0
SQL*Net break/reset to clien 34 0 0 1 0.0 .0
latch: enqueue hash chains 45 0 0 0 0.0 .0
latch: cache buffers lru cha 7 0 0 2 0.0 .0
latch: session allocation 5 0 0 1 0.0 .0
latch: object queue header o 6 0 0 1 0.0 .0
ASM file metadata operation 30 0 0 0 0.0 .0
latch: In memory undo latch 15 0 0 0 0.0 .0
latch: undo global data 8 0 0 0 0.0 .0
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jobq slave wait 7,270 100 3,635 500 0.0
SQL*Net more data from clien 7,976 0 15 2 0.0
SQL*Net message to client 6,362,544 0 8 0 33.7
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log file parallel write 299,537 0 164 1 1.6 9.7
log file sequential read 698 0 16 24 0.0 1.0
db file parallel write 9,556 0 13 1 0.1 .8
os thread startup 146 0 10 70 0.0 .6
control file parallel write 2,037 0 2 1 0.0 .1
Log archive I/O 35 0 1 30 0.0 .1
LGWR wait for redo copy 2,447 0 0 0 0.0 .0
db file async I/O submit 9,556 0 0 0 0.1 .0
db file sequential read 145 0 0 2 0.0 .0
Disk file operations I/O 349 0 0 0 0.0 .0
db file scattered read 30 0 0 4 0.0 .0
control file sequential read 5,837 0 0 0 0.0 .0
ADR block file read 19 0 0 4 0.0 .0
ADR block file write 5 0 0 15 0.0 .0
direct path write 14 0 0 2 0.0 .0
direct path read 3 0 0 7 0.0 .0
latch: shared pool 3 0 0 6 0.0 .0
log file single write 56 0 0 0 0.0 .0
latch: redo allocation 53 0 0 0 0.0 .0
latch: active service list 1 0 0 3 0.0 .0
latch free 11 0 0 0 0.0 .0
rdbms ipc message 314,523 5 57,189 182 1.7
Space Manager: slave idle wa 4,086 88 18,996 4649 0.0
DIAG idle wait 7,185 100 7,186 1000 0.0
Streams AQ: waiting for time 2 50 4,909 ###### 0.0
Streams AQ: qmn slave idle w 129 0 3,612 28002 0.0
Streams AQ: qmn coordinator 258 50 3,612 14001 0.0
smon timer 43 2 3,605 83839 0.0
pmon timer 1,199 99 3,596 2999 0.0
SQL*Net message from client 17,019 0 31 2 0.1
SQL*Net message to client 12,762 0 0 0 0.1
class slave wait 28 0 0 0 0.0
thank you very much!

Hi: just know it now: it is a large amount of 'concurrent transaction' designed in this "Volume Test" - to simulate large incoming transaction volme, so I guess wait in eq:TX - row is expected.
The fact: (1) redo logs at uat server is known to not well-tune for configurations (2) volume test slow 5%, however data amount in its test is kept the same by each time import production data, by the team. So why it slowed 5% this year?
The wait histogram is pasted below, any one interest to take a look? any ideas?
Wait Event Histogram DB/Inst: XXXX/XXXX Snaps: 5635-5636
-> Total Waits - units: K is 1000, M is 1000000, G is 1000000000
-> % of Waits - column heading: <=1s is truly <1024ms, >1s is truly >=1024ms
-> % of Waits - value: .0 indicates value was <.05%, null is truly 0
-> Ordered by Event (idle events last)
 Total ----------------- % of Waits ------------------
Event Waits <1ms <2ms <4ms <8ms <16ms <32ms <=1s >1s
ADR block file read 19 26.3 5.3 10.5 57.9
ADR block file write 5 40.0 60.0
ADR file lock 6 100.0
ARCH wait for archivelog l 14 100.0
ASM file metadata operatio 30 100.0
CSS initialization 30 100.0
Disk file operations I/O 9090 97.2 1.4 .6 .4 .2 .1 .1
LGWR wait for redo copy 2447 98.5 .5 .4 .2 .2 .2 .1
Log archive I/O 35 40.0 8.6 25.7 2.9 22.9
SQL*Net break/reset to cli 34 85.3 8.8 5.9
SQL*Net more data to clien 29K 99.9 .0 .0 .0 .0 .0
buffer busy waits 1800 96.8 .7 .7 .6 .3 .4 .5
control file parallel writ 2037 90.7 5.0 2.1 .8 1.0 .3 .1
control file sequential re 7405 100.0 .0
cursor: pin S 10 10.0 90.0
db file async I/O submit 9556 99.9 .0 .0 .0
db file parallel read 1 100.0
db file parallel write 9556 62.0 32.4 1.7 .8 1.5 1.3 .1
db file scattered read 345 72.8 3.8 2.3 11.6 9.0 .6
db file sequential read 6199 97.2 .2 .3 1.6 .7 .0 .0
direct path read 7699 99.1 .4 .2 .1 .1 .0
direct path sync 8 25.0 37.5 12.5 25.0
direct path write 13K 97.8 .9 .5 .4 .3 .1 .0
enq: TX - row lock content 4480 .4 .7 1.3 3.0 6.8 12.3 75.4 .1
latch free 301 98.3 .3 .7 .7
latch: In memory undo latc 15 93.3 6.7
latch: active service list 1 100.0
latch: cache buffers chain 55 94.5 3.6 1.8
latch: cache buffers lru c 9 88.9 11.1
latch: call allocation 6 100.0
latch: checkpoint queue la 3 100.0
latch: enqueue hash chains 45 97.8 2.2
latch: messages 4 100.0
latch: object queue header 7 85.7 14.3
latch: redo allocation 113 97.3 1.8 .9
latch: row cache objects 19 89.5 5.3 5.3
latch: session allocation 5 80.0 20.0
latch: shared pool 147 90.5 1.4 2.7 1.4 .7 1.4 2.0
latch: undo global data 8 100.0
library cache: mutex X 28 89.3 3.6 3.6 3.6
log file parallel write 299K 95.6 2.6 1.0 .4 .3 .2 .0
log file sequential read 698 29.5 .1 4.6 46.8 18.9
log file single write 56 100.0
log file switch (checkpoin 4 25.0 50.0 25.0
log file switch (private s 8 12.5 37.5 50.0
log file sync 284K 93.3 3.7 1.4 .7 .5 .3 .1
os thread startup 146 100.0
row cache lock 41 85.4 9.8 2.4 2.4
DIAG idle wait 7184 100.0
SQL*Net message from clien 6379K 86.6 5.1 2.9 1.3 .7 .3 2.8 .3
SQL*Net message to client 6375K 100.0 .0 .0 .0 .0 .0 .0
Wait Event Histogram DB/Inst: XXXX/xxxx Snaps: 5635-5636
-> Total Waits - units: K is 1000, M is 1000000, G is 1000000000
-> % of Waits - column heading: <=1s is truly <1024ms, >1s is truly >=1024ms
-> % of Waits - value: .0 indicates value was <.05%, null is truly 0
-> Ordered by Event (idle events last)
 Total ----------------- % of Waits ------------------
Event Waits <1ms <2ms <4ms <8ms <16ms <32ms <=1s >1s
SQL*Net more data from cli 7976 99.7 .1 .1 .0 .1
Space Manager: slave idle 4086 .1 .2 .0 .0 .3 3.2 96.1
Streams AQ: qmn coordinato 258 49.2 .8 50.0
Streams AQ: qmn slave idle 129 100.0
Streams AQ: waiting for ti 2 50.0 50.0
class slave wait 28 92.9 3.6 3.6
jobq slave wait 7270 .0 100.0
pmon timer 1199 100.0
rdbms ipc message 314K 10.3 7.3 39.7 15.4 10.6 5.3 8.2 3.3
smon timer 43 100.0

Wait events 'direct path write' and 'direct path read'

Hi,
We have a query which is taking more that 2 min. It's a 9.2.0.7 database. We took the trace/tkprof of the query,and identified that there are so manay 'direct path write' and 'direct path read' wait events in the trace file.
WAIT #3: nam='direct path write' ela= 5 p1=201 p2=70710 p3=15
WAIT #3: nam='direct path read' ela= 170 p1=201 p2=71719 p3=15
In the above, "p1=201" is a file_id, but we could not find any data file, temp file, control file with that id# 201.
Can you please let us know what's "p1=201" here, how to identify the file which is causing the issue.
Thanks
Sravan

What does:
show parameter db_filesreturn? My guess, is that it returns 200.
The direct file read and direct file write events are reads and writes to TEMP tablespace. In those wait events, the file# is reported as db_files+temp file id. So, 201 means temp file #1.
Now, as to your actual performance problem.
Without seeing the SQL and the corresponding execution plan, it's impossible to be sure. However, the most common causes of temp writes are sort operations and group by operations.
If you decide to post your SQL and execution plan, please be sure to make it readable by formatting it. Information on how to do so can be found here.
Hope that helps,
-Mark
Edited by: mbobak on May 1, 2011 1:50 AM

How do I access classes and methods defined in a wsdl file

I have been provided a wsdl file I need to find out how do I access classes and methods defined in a wsdl file directly instead of doing a wsdl2java...

Several comments :
1- is there any reason to have blank chars inserted after the path ? Seems that you already have a problem there. If possible, try to solve the problem at the source
2- the end of line char is usually CR (Carriage Return, aka ASCII char 13 = $0D = Control-D). But LF (Line Feed = 10 = $0A = control-A) is also used (platform dependent). In LV, you can use the "Concatenate strings" function to add/insert control chars (found in the String Control Palette). However, this will not solve your problem of unwanted added blank chars at the end of your string.
3- you can use the Trim white space.vi (in the "Additionnal string functions" sub-palette) to remove ALL the spaces in your string
4- you can build your own "end space remover" function. :
reverse the string, wire to a "Match pattern" function, use " +" (space + "+") to search for any number of spaces, reverse again the "after substring".
5- there is no point 5 :-)
You may find interesting description of ASCII chars here
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

What do the wait events 'gc cr failure' and 'cr request retry' mean?

I'm trying to troubleshoot an issue for a customer. Environment is Oracle 10.2.0.4 (64-bit) on Redhat 5. Two node RAC cluster. The 10046 trace file shows lots of 'gc current block 2-way' waits but also a few 'gc cr failure' and 'cr request retry' waits. The 'cr request retry' waits take about 0.9 seconds each. I cannot find much if any information on these two wait events. Any help is much appreciated.
Thanks!

Hi,
Also, you might need to check the protocol is being used for the interconnect communication.
here are the steps just in case:
$ORACLE_HOME/bin/sqlplus / as sysdba
oradebug setmypid
oradebug unlimit
oradebug ipc
oradebug TRACEFILE_NAME
Review the file that the last oradebug gave you back.
Metalink note 181489.1 provides some handy steps to analyze your situation. (also contains the latest supported protocols for IPC)
Hope this helps
Regards,
Jozsef

Wait events and locks monitoring /resolving scripts

Looking for wait events and locks monitoring /resolving scripts /tips.

Hi,
Looking for wait events and locks monitoring /resolving scriptsHere is the collection of monitoring scripts that I
use, and it has dozens of scripts for locking:
http://www.oracle-script.com
For one-off scripts, here is a script by Laurent Baylac to show locks in Oracle 10g:
http://www.dba-village.com/village/dvp_scripts.ScriptDetails?ScriptIdA=3508
SET LINESIZE 500
SET PAGESIZE 1000
COLUMN username FORMAT A15
COLUMN machine FORMAT A25
COLUMN logon_time FORMAT A20
SELECT LPAD(' ', (level-1)*2, ' ') || NVL(s.username, '(oracle)') AS username,
s.osuser,
s.sid,
s.serial#,
s.lockwait,
s.status,
s.module,
s.machine,
s.program,
TO_CHAR(s.logon_Time,'DD-MON-YYYY HH24:MI:SS') AS logon_time
FROM v$session s
CONNECT BY PRIOR s.sid = s.blocking_session
START WITH s.blocking_session IS NULL;
SET PAGESIZE 14
-- Search for locked objects
-- To be executed under the SYSTEM account
-- Compatible with Oracle10.1.x and higher
select
distinct to_name object_locked
from
v$object_dependency
where
to_address in
select /*+ ordered */
w.kgllkhdl address
from
dba_kgllock w,
dba_kgllock h,
v$session w1,
v$session h1
where
(((h.kgllkmod != 0) and (h.kgllkmod != 1)
and ((h.kgllkreq = 0) or (h.kgllkreq = 1)))
and
(((w.kgllkmod = 0) or (w.kgllkmod= 1))
and ((w.kgllkreq != 0) and (w.kgllkreq != 1))))
and w.kgllktype = h.kgllktype
and w.kgllkhdl = h.kgllkhdl
and w.kgllkuse = w1.saddr
and h.kgllkuse = h1.saddr
Don Burleson
Oracle Press author

Access method and wait event

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