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DBA_HIST_SQLSTAT "delta" columns

edited Oct 28, 2012 8:32AM in Database Administration (MOSC) 10 commentsAnswered
A) According to Metalink note: 471053.1:

DBA_HIST_SQLSTAT displays historical information about SQL statistics. This view captures the top SQL statements based on a set of criteria and captures the statistics information from V$SQL.

The total value is the value of the statistics since instance startup.

The delta value is the value of the statistics from the BEGIN_INTERVAL_TIME to the END_INTERVAL_TIME in the DBA_HIST_SNAPSHOT view.

According to http://docs.oracle.com/cd/B19306_01/server.102/b14237/statviews_3183.htm

This column is not since instance startup but since it was brought into the library cache...which would happen every time it aged out and was needed again.

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