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Oracle® Database Reference
12c Release 1 (12.1)

E17615-23
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DBA_HIST_PROCESS_MEM_SUMMARY

DBA_HIST_PROCESS_MEM_SUMMARY displays historical information about dynamic PGA memory usage by named component categories for each process.

Column Datatype NULL Description
SNAP_ID NUMBER NOT NULL Unique snapshot ID
DBID NUMBER NOT NULL Database ID for the snapshot
INSTANCE_NUMBER NUMBER NOT NULL Instance number for the snapshot
CATEGORY VARCHAR2(15) NOT NULL Category name. Categories include "SQL", "PL/SQL", "OLAP" and "JAVA". Special categories are "Freeable" and "Other". Freeable memory has been allocated to the process by the operating system, but has not been allocated to a category. "Other" memory has been allocated to a category, but not to one of the named categories
NUM_PROCESSES NUMBER   Number of processes
NON_ZERO_ALLOCS NUMBER   Number of processes with nonzero allocations
USED_TOTAL NUMBER   Bytes of PGA memory used by the process for the category
ALLOCATED_TOTAL NUMBER   Total number of bytes of PGA memory allocated by the process for the category.
ALLOCATED_AVG NUMBER   Average number of bytes of PGA memory allocated by the process for the category
ALLOCATED_STDDEV NUMBER   Standard deviation of the number of bytes of PGA memory allocated by the process for the category
ALLOCATED_MAX NUMBER   Maximum bytes of PGA memory ever allocated by the process for the category
MAX_ALLOCATED_MAX NUMBER   Maximum bytes of PGA memory that can be allocated by the process for the category
CON_DBID NUMBER   The database ID of the PDB for the sampled session
CON_ID NUMBER   The ID of the container that CON_DBID identifies. Possible values include:
  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data