When the database server needs more memory than SHMTOTAL allows, a transient condition occurs, perhaps caused by a burst of activity that exceeds the normal processing load. Only the operation that caused the database server to run out of memory temporarily should fail. Other operations continue to be processed in a normal fashion.
If messages indicate on a regular basis that the database server needs more memory than SHMTOTAL allows, you have not configured the database server correctly. Lowering the value of BUFFERS or DS_TOTAL_MEMORY is one possible solution, and increasing the value of SHMTOTAL is another.
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