Database performance in AIX
Dear Gurus,
Sometimes users complain slow performance and today when I checked the AWR,
The first two lines of Top 5 events are:
Event Waits Time(s) Avg Time
latch: library cache 242110 51155 211 37.4 Concurrency
latch: shared pool 113896 19283 169 14.1 Concurrency
I got this URL http://www.ardentperf.com/2007/06/27/case-study-statspackawr-latch-waits-part-1 , which suggested tuning the AIX and also a note: 316533.1, which explains tuning minperm%, maxperm% and maxclient%, in the note it is suggested to take the output of svmon -G, using which we can calculate percentage of physical memory being used by AIX to buffer file I/O. In the note example, it shows 63% of physical ram is being used by AIX to buffer file I/O.
I have changed minperm% to 10, maxperm% to 20 and maxclient% to 20.
After this change the svmon -G output is:
# svmon -G
. size inuse free pin virtual
memory 2998272 2995389 2885 718202 3241361
pg space 6291456 923372
. work pers clnt
pin 718202 0 0
in use 2656658 56159 282572
If we use the formula mentioned in the note, the percentage of physical memory used by AIX to buffer file I/O comes to approx. 90%.
I am concerned with this value. Oracle suggests this value to be close to 30% in the same note. Based on the same note, the lru_file_repage parameter also has been modified to 0.
OS is AIX 5.3
DB is 10.2.0.4
Experts please advise.
Regards,
SA
Sorry,
Looks like there is a mistake in my calculation, I am supposed to use *(in use - pers+ in user - clnt)/ memory size*
i.e.
(56159+282572)/2998272 comes to around 11%Thanks
SA
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kindly pls explain why the database is running slow?Pls tell me what parameter shuld i change in the init.ora so that the database performance increases?Is only Oracle running slow?
Are some query running slow?
I think that you might not be able to increase performance
by changing only oracle parameter.
What kind of programs and services are running on your Windows?
Are they disturbing <s>Oracle sleeping</s> Oracle running?
Please check them first.
Oops, I'm not native, so I have mistake in using word.
Sorry.
Message was edited by:
ushitaki -
Can anyone help me? I just anted to know which are best and
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bye bye
subbu
The Oracle Performance and Tuning class is very good at least
when I took it around 2 years ago.
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too deep for me most of the time since I've worked with Oracle
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explanation on use of V$SESSION_WAIT, V$SESSION_EVENT, and
V$SYSTEM_WAIT. V$SESSION_WAIT tells you what application is
wating and what is the event wait occuring.
Let me know if you want it. -
Database Performance Evaluation Benchmarking Tuning
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Who takes up the task of database performance tuning....is it the BW consulant or anyother?
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Srinivas.D -
Oracle : 10.2.0.3
OS : Linux 64 bit
Issue : Slow performance at 11-30PM complained by client.
Checks done :
1. Ran AWR between 11 PM and 12 Noon.
CPUs : 4 SGA Size : 2,000M (100%) Buffer Cache : 1,584M (79.2%) Shared Pool 1,129M (56.4%)
ADDM suggest SGA_TARGET to increase from 2000MB to 2500MB.
2. top 5 events
Top 5 Timed Events Avg %Total
~~~~~~~~~~~~~~~~~~ wait Call
Event Waits Time (s) (ms) Time Wait Class
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read by other session 293,022 877 3 5.6 User I/O
log file sync 9,920 157 16 1.0 Commit
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4. Index rebuild requirement is not there
SQL> SELECT name,height,lf_rows,del_lf_rows,(del_lf_rows/lf_rows)*100 as ratio FROM INDEX_STATS;
no rows selected5. Average 100 sessions will connect to the database
6. Checked all logs fr any disconnection details
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Questions : How to certify the performance is good or slow from the above observations. I am able to feel the statistics are the similar for the different periods where I ran AWR report.
: Other than the user as a DBA what are the other checks can be done to monitor the performanceIt's difficult to use AWR or Statspack to "certify" database performance is good. It just depends what "performance is good" means.
Most of the time it's application response time which is the right metric: database response time is only a part of application response time and AWR/Statspack cannot easily link database response time and application response time.
[11.2 Concepts Guide Principles of Application Design and Tuning| http://download.oracle.com/docs/cd/E11882_01/server.112/e10713/cncptdev.htm#CHDEHHIJ] says
>
Define clear performance goals and keep historical records of metrics
An important facet of development is determining exactly how the application is expected to perform and scale. For example, you should use metrics that include expected user load, transactions per second, acceptable response times, and so on. Good practice dictates that you maintain historical records of performance metrics. In this way, you can monitor performance proactively and reactively (see "Performance Diagnostics and Tuning"). -
Hi to all,
My database performance is suddenly going slow. My PGA Cahe hit percentage remain in 96%.
I will list out the findidngs I found...
Some tables were not analyzed since Dec2007. Some tables were never analyzed.
(Will the tables were analyzed the performance will be improved for this scenario)
PGA Allocated is 400MB. But till now the max pga allocated is 95MB since Instance started (11 Nov 08 - Instance started date).
(I persume we have Over allocated PGA can i reduce it to 200MB and increase the Shared pool and Buffer Cache 100MB each?)
Memory Configuration:
Buffer Cache: 504 MB
Shared Pool: 600 MB
Java Pool: 24MB
Large Pool: 24MB
SGA Max Size is: 1201.72 MB
PGA Aggregate is: 400 MB
My Database resided in Windows 2003 Server Standard Edition with 4GB of RAM.
Please give me suggestions.
Thanks and Regards,
Vijayaraghavan KVijayaraghavan Krishnan wrote:
My database performance is suddenly going slow. My PGA Cahe hit percentage remain in 96%.
Some tables were not analyzed since Dec2007. Some tables were never analyzed.
PGA Allocated is 400MB. But till now the max pga allocated is 95MB since Instance started (11 Nov 08 - Instance started date).
(I persume we have Over allocated PGA can i reduce it to 200MB and increase the Shared pool and Buffer Cache 100MB each?)
You are in an awkward situtation - your database is behaving badly, but it has been in an unhealthy state for a very long time, and any "simple" change you make to address the performance could have unpredictable side effects.
At this moment you have to think at two levels - tactical and strategic.
Tactical - is there anything you can do in the short term to address the immediate problem.
Strategic - what is the longer-term plan to sort out the state of the database.
Strategically, you should be heading for a database with correct indexing, representative data statistics, optimium resource allocation, minimum hacking in the parameter file, and (probably) implementation of "system statistics".
Tactically, you need to find out which queries (old or new) have suddenly introduced an extra work load, or whether there has been an increase in the number of end-users, or other tasks running on the machine.
For a quick and dirty approach you could start by checking v$sql every few minutes for recent SQL that might be expensive; or run checks for SQL that has executed a very large number of times, or has used a lot of CPU, or has done a lot of disk I/O or buffer gets.
You could also install statspack and start taking snapshots hourly at level 7, then run off reports covering intervals when the system is slow - again a quick check would be to look at the "SQL ordered by .." sections of the report to the expensive SQL.
If you are lucky, there will be a few nasty SQL statements that you can identify as responsible for most of your resource usage - then you can decide what to do about them
Regarding pga_aggregate_target: this is a value that is available for sharing across all processes; from the name you've used, I think you may be looking at a figure for a single specific process - so I wouldn't reduce the pga_aggregate_target just yet.
If you want to post a statspack report to the forum, we may be able to make a few further suggestions. (Use the "code" tags - in curly brackets { } to make the report readable in a fixed fontRegards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"The temptation to form premature theories upon insufficient data is the bane of our profession."
Sherlock Holmes (Sir Arthur Conan Doyle) in "The Valley of Fear".
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