Applies to:Oracle Server - Enterprise Edition
Information in this document applies to any platform.
Oracle Server Enterprise Edition
Memory Notification: Library Cache Object loaded into SGA
Heap size 2294K exceeds notification threshold (2048K)
The meaning is that the process is just spending a lot of time in finding free memory extents during an allocate as the memory may be heavily fragmented. Fragmentation in memory is impossible to eliminate completely, however, continued messages of large allocations in memory indicate there are tuning opportunities on the application.
The messages do not imply that an ORA-4031 is about to happen.
Set _kgl_large_heap_warning_threshold to a reasonable high value or zero to prevent these warning messages. Value needs to be set in bytes.
If you want to set this to 8192 (8192 * 1024) and are using an spfile:
(logged in as "/ as sysdba")
SQL> alter system set "_kgl_large_heap_warning_threshold"=8388608 scope=spfile ;
SQL> shutdown immediate
If using an "old-style" init parameter,
Edit the init parameter file and add
NOTE: The default threshold in 10.2.0.1 is 2M. So these messages could show up frequently in some application environments.
In 10.2.0.2, the threshold was increased to 50MB after regression tests, so this should be a reasonable and recommended value.