Question about the shared_pool sizes in Oracle 11 GR 2

Hello! I administer a 11 GR 2 Oracle database which runs on IBM, OS AIX 6.1 hardware. The LPAR has 44 Gb of available memory and 8 assigned dual-core processors.

Normally, everything works fine and we have no problems. Today the database started to reject connections all of a sudden. The issue lasted about 14 minutes and then allowed himself. When you check the alerts log, it indicates a memory problem with the shared_pool, ORA-4031 error out.

I am using the 11g automatic memory management functionality, and memory_max_target has the value 14 GB. I'll increase memory_max_target of 18 GB as part of my solution, but which will also increase so the shared_pool size in the SGA? It is best to leave the database to manage the size of the shared_pool, or may (and it) I put it at a minimum size?

Any help or links to documentation or MOS notes, are greatly appreciated. Thank you!

Mark


Before suggesting that you change your memory in use management, I would like more information such as how long have your summer working with the system in this way?  How long had the system works since his last start?

If you have access to AWR AWR report for the period of the problem shows?  Any unusual activity?  Were all the new features or major transformation recently added to the application.

When you view the memory management view the frequency with which Oracle moves PGA to SGA granules, since the buffers to the pool shared cache and so on.

The next note of support can help try to determine what issues you face in what concerns the ORA-04031 providing the problem occurs again.

Document Oracle # 1088239.1 Master Note for diagnosing the ORA-4031

HTH - Mark D Powell.

Tags: Database

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