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Oracle® Database Reference
12c Release 1 (12.1)

E41527-09
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DBA_HIST_PARAMETER

DBA_HIST_PARAMETER displays historical information about the initialization parameters that were in effect for the instance. This view contains snapshots of V$SYSTEM_PARAMETER.

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
PARAMETER_HASH NUMBER NOT NULL Parameter hash
PARAMETER_NAME VARCHAR2(64) NOT NULL Name of the parameter
VALUE VARCHAR2(512)   Parameter value for the session (if modified within the session); otherwise, the instance-wide parameter value
ISDEFAULT VARCHAR2(9)   Indicates whether the parameter is set to the default value (TRUE) or the parameter value was specified in the parameter file (FALSE)
ISMODIFIED VARCHAR2(10)   Indicates whether the parameter has been modified after instance startup:
  • MODIFIED - Parameter has been modified with ALTER SESSION

  • SYSTEM_MOD - Parameter has been modified with ALTER SYSTEM (which causes all the currently logged in sessions' values to be modified)

  • FALSE - Parameter has not been modified after instance startup

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