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ORA-04031: unable to allocate string bytes of shared memory("string","string","string","string") tips

Oracle Error Tips by Burleson Consulting

 

Oracle docs note this about ORA-04031:

ORA-04031: unable to allocate string bytes of shared memory ("string","string","string","string")
Cause: More shared memory is needed than was allocated in the shared pool.
Action: If the shared pool is out of memory, either use the dbms_shared_pool package to pin large packages, reduce your use of shared memory, or increase the amount of available shared memory by increasing the value of the INIT.ORA parameters "shared_pool_reserved_size" and "shared_pool_size". If the large pool is out of memory, increase the INIT.ORA parameter "large_pool_size".

There are many valuable resources regarding shared pool sizing, and ORA-04031 is very commonly encountered in situations involving the sizing of large pools. Below is an excerpt from an the article, Oracle Concepts - Shared Pool and Multi-Threaded Server (MTS) in which ORA-04031 is addressed and offered a resolution.

If ORA-04031 is thrown, consider using the following select:

SELECT name, SUM(bytes) FROM V$SGASTAT WHERE pool='LARGE POOL'
GROUP BY ROLLUP(name);

Though the number of bytes may vary, ORA-04031 is commonly thrown in operations with configured large pools.

The exampled select above offers a summary of the number of bytes which will reveal the current pool size and you proximity to the maximum pool size which is specified within the LARGE_POOL_SIZE parameter.  You will find that when the LARGE_POOL is increased up to 100%, ORA-04031 will typically be eliminated.

To help you to understand more clearly the impact that large pool sizing can have in resolving ORA-04031, you may be interested in the statement below:

Sizing the large pool can be complex. The large pool, if configured must be at least 600 kilobytes in size. Usually for most MTS applications 600k is enough. However, if PQO is also used in your Oracle8 environment then the size of the large pool will increase dramatically. The V$SGASTAT dynamic performance view has a new column in Oracle8, POOL. The POOL column in the V$SGASTAT view is used to contain the pool area where that particular type of object is being stored. By issuing a summation select against the V$SGASTAT view a DBA can quickly determine the size of the large pool area currently being used.

For the full article regarding ORA-04031 and large pool sizing, check out this link:

http://www.dba-oracle.com/concepts/shared_pool_mts.htm

Here is another example from Oracle Forums.

Question:

To resolve ORA-04031, I need to manually allocate memory for the shared pool, but the ORA-04031 is still occurring.  How can I properly allocate the value to resolve ORA-04031?

Answer:

With SGA_TARGET, the shared_pool_size is overlooked by the parameter file.  IIf this is causing ORA-04031 to be thrown, you need to run statspack reports so that you know there is space to allocate, even if the shared pool looks like it has enough free space.

The shared pool fragment should be trouble-shot for the source of ORA-04031, and you may want to try to increase the SHARED_POOL_SIZE and restart the database.
 


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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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