Below are some possible cause
- Insufficient memory allocated via initialization parameters
- Fragmentation in app design
- Auto tuning issues
- A Bug causing the issue
- Memory leaks
< ORA-00604: error occurred at recursive SQL level 1 < ORA-04031: unable to allocate 40 bytes of shared memory ("shared pool","unknown object","KGLH0^f185eace","kglHeapInitialize:temp")
< ORA-04031: unable to allocate 12312 bytes of shared memory ("shared pool","unknown object","KKSSP^394","kglseshtTable")
The error message will provide the amount of memory unavailable, memory pool facing the issue and failed allocation details
Select * from V$SGA_TARGET_ADVICE
Note that in order to initialization parameters to take into effect we need to bounce the instance.
AGLT>oerr ora 04031
04031, 00000, "unable to allocate %s bytes of shared memory (\"%s\",\"%s\",\"%s\",\"%s\")"
// *Cause: More shared memory is needed than was allocated in the shared
// pool or Streams 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
// initialization parameters SHARED_POOL_RESERVED_SIZE and
// SHARED_POOL_SIZE.
// If the large pool is out of memory, increase the initialization
// parameter LARGE_POOL_SIZE.
// If the error is issued from an Oracle Streams or XStream process,
// increase the initialization parameter STREAMS_POOL_SIZE or increase
// the capture or apply parameter MAX_SGA_SIZE.
// parameter MAX_SGA_SIZE.
Refer below links for Oracle support notes
- This Oracle support note provides information about ORA-04031 related bugs and which release they were fixed
- This Oracle note provides detailed troubleshooting and diagnosing details
- This Oracle note provides detailed understanding and tuning of the of the shared pool
Thanks & Regards,
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