Re: DBA_HIST_SQLSTAT
- From: Andy Klock <andy@xxxxxxxxxxxxxxx>
- To: oratune@xxxxxxxxx
- Date: Tue, 20 Nov 2012 14:24:46 -0500
On Tue, Nov 20, 2012 at 12:24 PM, David Fitzjarrell <oratune@xxxxxxxxx>wrote:
> They don't, actually. The executions_total is the total executions since
> the database was started, the elapsed_time_total is the total since the db
> was started and the deltas are for each snapshot and don't roll up. I
> came into a shop where a script was running to generate execution time
> reports for long-running queries but it didn't take into account that the
> deltas don't roll up. I rewrote it to provide total execution times across
> snapshots for a given sql_id:
>
My experience is hit and miss when making calculations with
executions_total and executions_delta. The reason being these numbers
aren't cumulative to the start of the instance but rather since the time
they've been in the library cache. (same as v$sqlstats). So, sometimes for
long running queries (that span across multiple snapshots) it's possible
that they will never show an execution in AWR.
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