How to take awr report

A little confused in generating awr report using awrrpt.sql
Here are the snapshots we have in the repository.
8257 13 Nov 2013 02:00
1
8258 13 Nov 2013 02:30
1
8259 13 Nov 2013 03:00
1
8260 13 Nov 2013 03:30
1
8261 13 Nov 2013 04:00
1
8262 13 Nov 2013 04:30
1
And the test run we'd was between 2:15 to 3:45. which snapshots should we choose as the begin snap ID and end snap ID.
I got this question when i saw how the snapshots were taken like snap ID 8258
SNAP_ID BEGIN_INTERVAL_TIME
END_INTERVAL_TIME
8258 13-NOV-13 02.00.19.314 AM
13-NOV-13 02.30.23.284 AM
where i was going to select 8257 as the begin snap ID.
Which snap IDs makes more sense for the time window of 2:15 to 3:45 ?
Thanks
Siva.

It seems you are confused by BEGIN_INTERVAL_TIME (you can look on this column as orientation for the interval, begin/end) and END_INTERVAL_TIME.
END_INTERVAL_TIME is the time when the snapshot is taken,
In your case:
SNAP_ID BEGIN_INTERVAL_TIME
END_INTERVAL_TIME
8258 13-NOV-13 02.00.19.314 AM
13-NOV-13 02.30.23.284 AM
So,
SNAP_ID = 8258 with BEGIN_INTERVAL_TIME = 02.00.19.314 AM
If you check previous SNAP_ID = 8257, that snap will have END_INTERVAL_TIME = 02.00.19.314 AM
Taking a snapshot doesn't last 30 min. If you need to know how much time the database spent to take the snapshot you can query FLUSH_ELAPSED column from DBA_HIST_SNAPSHOT.
I.Arsov
Message was edited by: IvicaArsov

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