Solved

Oracle 11g database undersized SGA in ADDM report

Posted on 2012-03-28
2
2,789 Views
Last Modified: 2012-03-28
Hi All,

We are seeing multiple databases that are getting undersized SGA in the ADDM reports. Luckily most of them are not seeing any VM_IN_BYTES and VM_OUT_BYTES.

Reading online we found that this may be from sql area reloads and hard parses. We are seeing 7,634 reloads in the library cache activity within an hour  and 4.1 hard parses per second in a AWR report.

We currently have 24GB of physical memory, 11.7GB allocated to SGA and 7.8GB allocated to PGA. Are there any queries that we can run to see how much more memory we will need to increase by? At what point with the sql area reload and hard parses do we need to look at buying additional memory?

Thanks for your time.
0
Comment
Question by:mw-hosting
2 Comments
 
LVL 76

Accepted Solution

by:
slightwv (䄆 Netminder) earned 500 total points
ID: 37777652
check the memory advisor:
http://www.dba-oracle.com/oracle10g_tuning/t_memory_advisor.htm

If you don't have OEM access there are advice views:  
v$db_cache_advice
v$memory_target_advice
v$sga_target_advice
v$pga_target_advice

Probably others I've overlooked.
0
 
LVL 7

Expert Comment

by:Piloute
ID: 37777712
Hi,

The official docs might be a good starting point :

http://docs.oracle.com/cd/B28359_01/server.111/b28274/memory.htm

There's many details in there you might consider...

Cheers,
P
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Can anyone please tell me what does below Stored Procedure does? 4 33
Repeat query 13 61
Oracle Verification of DataPump Export and Import 17 60
ORA-02288: invalid OPEN mode 2 56
Background In several of the companies I have worked for, I noticed that corporate reporting is off loaded from the production database and done mainly on a clone database which needs to be kept up to date daily by various means, be it a logical…
How to Unravel a Tricky Query Introduction If you browse through the Oracle zones or any of the other database-related zones you'll come across some complicated solutions and sometimes you'll just have to wonder how anyone came up with them.  …
This video explains at a high level with the mandatory Oracle Memory processes are as well as touching on some of the more common optional ones.
This video shows how to recover a database from a user managed backup

856 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