harsha_james
asked on
db2 snapshot timestamp explanation
Hi All,
If i scheduled snapshot through crontab at every 15 minutes as ,
db2 get snapshot for all on <dbname> |
gzip -9 > $DIR/snapshot_all_<dbname> _$(date +%Y_%m_%d_%H_%M).out.gz
then as output i got following files,
snapshot_PRDDB_2010_08_16_ 14_15.out
snapshot_PRDDB_2010_08_16_ 14_30.out
snapshot_PRDDB_2010_08_16_ 14_45.out
If I open 2nd file i.e. snapshot_PRDDB_2010_08_16_ 14_30.out then I got following value
Snapshot timestamp = 08/16/2010 14:30:02.182330
What does this timestamp mean,
SQL's logged in this snapshot executed from 14:15 to 14:30 OR 14:30 to 14:45 ?
If anyone has Idea please help me on this.
If i scheduled snapshot through crontab at every 15 minutes as ,
db2 get snapshot for all on <dbname> |
gzip -9 > $DIR/snapshot_all_<dbname>
then as output i got following files,
snapshot_PRDDB_2010_08_16_
snapshot_PRDDB_2010_08_16_
snapshot_PRDDB_2010_08_16_
If I open 2nd file i.e. snapshot_PRDDB_2010_08_16_
Snapshot timestamp = 08/16/2010 14:30:02.182330
What does this timestamp mean,
SQL's logged in this snapshot executed from 14:15 to 14:30 OR 14:30 to 14:45 ?
If anyone has Idea please help me on this.
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ASKER
Hi Greg,
Wonderful Explanation on Snapshots, Thank you very much for your efforts.
Wonderful Explanation on Snapshots, Thank you very much for your efforts.
"First database connect timestamp" OR "Last reset timestamp" whichever is later.
If you wanted a snapshot to show you the activity for a 15 minute interval, you would need to do the following (using an id with appropriate rights):
db2 reset monitor all
sleep 900 ## 900 seconds = 15 minutes
db2 get snapshot for all on db_name
You can still use your snapshots that you took using the script you showed us in your question. You would just have to open 2 snapshot files and do some subtraction to get just what happened in the last 15 minutes.
Keep in mind that SOME of the monitor elements are NOT cumulative - instead they represent the value at the time the snapshot was taken - for example: "Locks held currently".
Let me show you 2 examples of snapshots. Look at the entries I marked with "<<---" and do the time math.
This one shows a snapshot containing over 3 days of collected data:
First database connect timestamp = 08/26/2010 17:45:23.268096 <<---
Last reset timestamp =
Last backup timestamp = 08/29/2010 21:14:02.000000
Snapshot timestamp = 08/30/2010 09:42:09.309278 <<---
This shows a snapshot containing 4 minutes and 32 seconds of collected data:
First database connect timestamp = 08/26/2010 17:45:23.268096
Last reset timestamp = 08/30/2010 09:43:20.237385 <<---
Last backup timestamp = 08/29/2010 21:14:02.000000
Snapshot timestamp = 08/30/2010 09:47:52.899658 <<---
Hope that helps. Too bad you already gave out the points (but I'm a nice guy)...
- Greg