Trying to diagnose high "Network Wait" in my application
Hello,
I developed a simple standalone application that starts 4 threads. Essentially each thread is a database write operation by calling a stateless session bean (SLSB). The SLSB has a method that make use of Toplink Essentials JPA which is responsible of persisting the objects in the database. I am using an application diagnostic tool. This tool is showing high "Network Wait". For example 50% of the time is being spent on "java.net.SocketException" and finally in the following call "java.net.SocketInputStream -> socketRead0".
1. What is the reason for SocketException?
2. Could it because threads are trying to write at the same time?
I would appreciate if you could share with me any thoughts.
Thanks,
Mustafa
50% of the time is being spent on "java.net.SocketException" and finally in the following call "java.net.SocketInputStream -> socketRead0". That means that 50% of the time there is nothing to read. You would expect at least that, more like 90% IMO.
1. What is the reason for SocketException?What SocketException? Did you catch one? What was the text? Where was it thrown from?
2. Could it because threads are trying to write at the same time?Could what be because ...?
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OS:Solaris 64 bit
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DB Name DB Id Instance Inst Num Release Cluster Host
XXXXX 434917312 XXXXX 1 9.2.0.7.0 NO INgenius1
Snap Id Snap Time Sessions Curs/Sess Comment
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Physical reads: 33.25 1.43
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Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Buffer Hit %: 96.90 In-memory Sort %: 99.67
Library Hit %: 99.76 Soft Parse %: 98.84
Execute to Parse %: 73.74 Latch Hit %: 99.98
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Shared Pool Statistics Begin End
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% SQL with executions>1: 50.57 63.10
% Memory for SQL w/exec>1: 10.02 14.63
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db file sequential read 44,161 384 .66
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log file parallel write 166,602 82 .14
log file sync 67,683 71 .12
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-> s - second
-> cs - centisecond - 100th of a second
-> ms - millisecond - 1000th of a second
-> us - microsecond - 1000000th of a second
-> ordered by wait time desc, waits desc (idle events last)
Avg
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Event Waits Timeouts Time (s) (ms) /txn
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log file parallel write 166,602 0 82 0 2.0
log file sync 67,683 0 71 1 0.8
db file scattered read 6,676 0 54 8 0.1
db file parallel write 1,135 0 7 6 0.0
direct path read 1,117 0 3 3 0.0
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control file parallel write 1,200 0 2 1 0.0
control file sequential read 1,389 0 1 1 0.0
PX Deq: Execute Reply 112 0 0 4 0.0
direct path write 752 0 0 1 0.0
db file parallel read 9 0 0 42 0.0
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-> ordered by wait time desc, waits desc (idle events last)
Avg Wt Wait
Eq Requests Succ Gets Failed Gets Waits Time (ms) Time (s)
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TX 84,615 84,605 0 3 8.33 0
HW 118 118 0 2 2.00 0
PS 29 25 4 2 1.00 0
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I want to find out which sql statements are causing this high enqueue waits......
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Here is the Statspack Report..........
STATSPACK report for
DB Name DB Id Instance Inst Num Release Cluster Host
XXXXX 434917312 XXXXX 1 9.2.0.7.0 NO XXXXXxxx1
Snap Id Snap Time Sessions Curs/Sess Comment
Begin Snap: 1064 24-Sep-08 06:00:01 1,333 19.6
End Snap: 1065 24-Sep-08 07:00:01 1,344 19.7
Elapsed: 60.00 (mins)
Cache Sizes (end)
~~~~~~~~~~~~~~~~~
Buffer Cache: 1,152M Std Block Size: 8K
Shared Pool Size: 752M Log Buffer: 1,536K
Load Profile
~~~~~~~~~~~~ Per Second Per Transaction
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Logical reads: 777.20 33.48
Block changes: 180.58 7.78
Physical reads: 33.25 1.43
Physical writes: 7.51 0.32
User calls: 76.89 3.31
Parses: 23.29 1.00
Hard parses: 0.27 0.01
Sorts: 0.42 0.02
Logons: 0.05 0.00
Executes: 88.69 3.82
Transactions: 23.22
% Blocks changed per Read: 23.23 Recursive Call %: 61.50
Rollback per transaction %: 0.00 Rows per Sort: 738.76
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 100.00 Redo NoWait %: 100.00
Buffer Hit %: 96.90 In-memory Sort %: 99.67
Library Hit %: 99.76 Soft Parse %: 98.84
Execute to Parse %: 73.74 Latch Hit %: 99.98
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Shared Pool Statistics Begin End
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% SQL with executions>1: 50.57 63.10
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CPU time 333 .57
log file parallel write 166,602 82 .14
log file sync 67,683 71 .12
Wait Events for DB: XXXXX Instance: XXXXX Snaps: 1064 - 1065
-> s - second
-> cs - centisecond - 100th of a second
-> ms - millisecond - 1000th of a second
-> us - microsecond - 1000000th of a second
-> ordered by wait time desc, waits desc (idle events last)
Avg
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Event Waits Timeouts Time (s) (ms) /txn
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db file sequential read 44,161 0 384 9 0.5
log file parallel write 166,602 0 82 0 2.0
log file sync 67,683 0 71 1 0.8
db file scattered read 6,676 0 54 8 0.1
db file parallel write 1,135 0 7 6 0.0
direct path read 1,117 0 3 3 0.0
SQL*Net more data to client 3,932 0 2 0 0.0
control file parallel write 1,200 0 2 1 0.0
control file sequential read 1,389 0 1 1 0.0
PX Deq: Execute Reply 112 0 0 4 0.0
direct path write 752 0 0 1 0.0
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latch free 17 4 0 3 0.0
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PX Deq: Join ACK 3 0 0 2 0.0
PX Deq: Parse Reply 4 0 0 1 0.0
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PX Deq: Execution Msg 128 0 2 13 0.0
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-> ordered by wait time desc, waits desc (idle events last)
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Event Waits Timeouts Time (s) (ms) /txn
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db file parallel write 1,134 0 8 7 0.0
control file parallel write 1,200 0 2 1 0.0
control file sequential read 1,327 0 1 1 0.0
db file scattered read 44 0 0 10 0.0
db file sequential read 25 0 0 3 0.0
direct path read 23 0 0 3 0.0
rdbms ipc reply 67 0 0 0 0.0
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direct path write 23 0 0 0 0.0
buffer busy waits 2 0 0 0 0.0
rdbms ipc message 86,933 3,437 20,199 232 1.0
pmon timer 1,194 1,194 3,504 2935 0.0
smon timer 17 8 3,239 ###### 0.0
Enqueue activity for DB: XXXXX Instance: XXXXX Snaps: 1064 - 1065
-> Enqueue stats gathered prior to 9i should not be compared with 9i data
-> ordered by Wait Time desc, Waits desc
Avg Wt Wait
Eq Requests Succ Gets Failed Gets Waits Time (ms) Time (s)
TC 25 24 0 4 32.00 0
TX 84,615 84,605 0 3 8.33 0
HW 118 118 0 2 2.00 0
PS 29 25 4 2 1.00 0
End of Report (this is not the entire report,only posted part of it,getting error page when trying to post the entire report)
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TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
vif0.3 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:12 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2236 (2.1 KiB) TX bytes:0 (0.0 b)
xenbr1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:6 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1968 (1.9 KiB) TX bytes:0 (0.0 b)
xenbr2 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
xenbr3 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)Don't inject the Windows 7 version of the driver into your WinPE image. Depending on what version of ADK you are using determines what version of the driver you will inject into WinPE. If you are using MDT 2013 with ADK 8.1 you are using WinPE 5.0/5.1
which is basically Windows 8.1. Make a selection profile explicitly for your WinPE drivers to inject. Only include the drivers you want in the WinPE image. And match the architecture of the network and storage drivers (Windows 8.1 versions).
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. -
High Database Waits of type "other"
I justed added cpu patch 19 to my 11.1.0.7 windows 2008 database. Now I have a large amount of database waiting of type "other". See below.
Investigate the cause for high "unspecified wait event" waits. Refer to Oracle's "Database Reference" for the description of this wait event.
Action Investigate the cause for high "unspecified wait event" waits in Service "SYS$USERS".
Action Investigate the cause for high "unspecified wait event" waits in Module "DBMS_SCHEDULER"
Could stale statistics cause this and if so what is the correct way to gather system statistics. Do I unlock sys schema , gather data dictionary stats, and then lock sys schema?
Other thoughts what might cause this?
Thanks,
KathieHi,
You should run the following.
DBMS_STATS.GATHER_SYSTEM_STATS (
gathering_mode VARCHAR2 DEFAULT 'NOWORKLOAD',
interval INTEGER DEFAULT NULL,
stattab VARCHAR2 DEFAULT NULL,
statid VARCHAR2 DEFAULT NULL,
statown VARCHAR2 DEFAULT NULL);
dbms_stats.gather_system_stats(gathering_mode=>'start');
dbms_stats.gather_system_stats(gathering_mode=>'stop');
System statistics will start gathering afetr you run the command with start option. System stats gathering will stop and may show them locked after you run stop.
NOWORKLOAD: Will capture characteristics of the I/O system. Gathering may take a few minutes and depends on the size of the database. During this period Oracle will estimate the average read seek time and transfer speed for the I/O system. This mode is suitable for the all workloads. Oracle recommends to run GATHER_SYSTEM_STATS ('noworkload') after creation of the database and tablespaces. To fine tune system statistics for the workload use 'START' and 'STOP' or 'INTERVAL' options. If you gather both 'NOWORKLOAD' and workload specific (statistics collected using 'INTERVAL' or 'START' and 'STOP' ), the workload statistics will be used by optimizer. Collected components: cpuspeednw, ioseektim, iotfrspeed.
INTERVAL: Captures system activity during a specified interval. This works in combination with the interval parameter. You should provide an interval value in minutes, after which system statistics are created or updated in the dictionary or stattab. You can use GATHER_SYSTEM_STATS (gathering_mode=>'STOP') to stop gathering earlier than scheduled. Collected components: maxthr, slavethr, cpuspeed, sreadtim, mreadtim, mbrc.
START | STOP: Captures system activity during specified start and stop times and refreshes the dictionary or stattab with statistics for the elapsed period. Interval value is ignored. Collected components: maxthr, slavethr, cpuspeed, sreadtim, mreadtim, mbrc.
interval
Time, in minutes, to gather statistics. This parameter applies only when gathering_mode='INTERVAL'.
Regards -
why does my movie rental download stop and reload just before it completes the download. I've tried 4 times now after waiting hours for the download. Ugh!
This Apple article might help ya out -> iTunes Store: "Error (-50)" when downloading purchased content
Try following along with the article and deleting the cached downloads, then try again.
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