SQL Management Base Architecture
SQL Management Base Architecture
Within the SYSAUX data dictionary tablespace one can find a SQL Management Base entry for a one or more SQL statements when this feature is enabled.
The SQL Management Base will include the following components:
Plan History – these are plans which have previously been generated for a particular SQL statement. They include plans which have been accepted into the SQL Plan Baseline and those which have not been.
SQL Plan Baseline – these are a subset of plans within the Plan History for the SQL statement. These represent only those plans which have been accepted and considered to offer acceptable performance.
SQL Profile – these are objects which can improve performance by consulting past plans found within the Plan History.
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