Solved

10g performance

Posted on 2009-04-07
5
407 Views
Last Modified: 2013-12-18
Hi.

I've almost the same problem with two clients.

In the first, the old server was changed for a new and stronger server, with high performance. When they to that, and also installed oracle, the oracle performance was worst than in the old server. I searched for the parms of old server, and saw that in the new, less memory was allocated to oracle. Then, I changed the parms to became equal. For a few days oracle works fine. But now, I've received a mail telling that the performance slow down again.

In the second client, same application, but a little different study case. They've changed 9i for 10g. It is in automatic memory management. Also in this case, now the performance is worst than in 9i. Analyzing OEM, I saw that oracle is having so much I/O operations. Some updates and inserts was taking a long time to be completed, using so much I/O resources. I know that this can be an development problem. But I have a remote connection scheduled with the client in a few hours, when I'll try to change automatic to manual management, increase block_buffers, shared, and max_size, stop and start oracle server to see if the problem will be resolved. How can an application work worst in 10g than in 9i?
But, in case that this not work... I'll be without any others ideas to solve this problem... someone can help me with some tips if the actions described above doesn't work??

Thanks in advance.
0
Comment
Question by:Thiago_corporative
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 48

Expert Comment

by:schwertner
ID: 24086990
Run the statististics. After that flush the shared pool to
force Oracle to recompile and reoptimize the execution plans.

If you run into
ORA-01882: timezone region %s not found
study
Doc ID:  467722.1   DBMS_SCHEDULER And Time Zones ( DST ) Explained.
CREATE OR REPLACE PROCEDURE compute_statistics IS
BEGIN 
   dbms_stats.gather_database_stats(cascade=>true);
END compute_statistics;
/
 
 
set serveroutput on
set linesize 10000
BEGIN
   DBMS_OUTPUT.enable(100000);   
   dbms_scheduler.create_job(
      job_name => 'weekly_stats'
     ,job_type => 'STORED_PROCEDURE'
     ,job_action => 'compute_statistics'
     ,start_date => TO_TIMESTAMP_TZ('2009/10/22 2:10:00.000000 +08:00','yyyy/mm/dd hh24:mi:ss.ff tzh:tzm')
     ,repeat_interval => 'FREQ=WEEKLY'
     ,enabled => TRUE
     ,comments => 'Computes statistics over tables and indexes.'
     );
     DBMS_OUTPUT.PUT_LINE('Job successfully created.');
EXCEPTION 
     WHEN OTHERS THEN
       DBMS_OUTPUT.PUT_LINE(substr(sqlerrm,1,200)); 
END;
/

Open in new window

0
 

Author Comment

by:Thiago_corporative
ID: 24087059
I did it last week... but didn't resolved.
0
 
LVL 40

Accepted Solution

by:
mrjoltcola earned 500 total points
ID: 24087500
Not knowing how Oracle is configured leaves a lot of possibilities.

Redo logs, archive, undo, index and table updates all contribute to IO.

If you are doing redo log mirroring, are they on separate disk, or at least are you using a decent raid? Even though you should have at least 1 mirror for each log group, every redo mirror is extra IO.

Is redo on separate disk from undo?

About 20 more questions I could ask, but really you need to analyze the database and find where the problems lie. And I don't mean "analyze" in terms of computing statistics, I mean looking at all of the instance stats and narrowing down on where it is spending time.
0
 
LVL 48

Expert Comment

by:schwertner
ID: 24087794
Depends also by the kind of the disk storage.
If it is RAID array then you will experience delay.

Also there analyzing tables and indexes is tricky.
Pay attention on
(cascade=>true)

This commonly is missed and causes that the indexes are not
analyzed.
Also the shared pool should be flushed to force new plans.

After increasing the
db_buffer_cache
and the shared_pool_cache
the DB should work significantly faster.
0
 
LVL 40

Expert Comment

by:mrjoltcola
ID: 24097705
Was there a resolution you could share with us?
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Have you ever had to make fundamental changes to a table in Oracle, but haven't been able to get any downtime?  I'm talking things like: * Dropping columns * Shrinking allocated space * Removing chained blocks and restoring the PCTFREE * Re-or…
Shell script to create broker configuration file using current broker Configuration, solely for purpose of backup on Linux. Script may need to be modified depending on OS-installation. Please deploy and verify the script in a test environment.
Via a live example, show how to restore a database from backup after a simulated disk failure using RMAN.
This video shows how to copy an entire tablespace from one database to another database using Transportable Tablespace functionality.
Suggested Courses

623 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question