Oracle cache is still there after I restart the Oracle server - can it be?
Hello,
My name is Tal and I work for a software company called Mercury.
We have a strange case in Oracle 9.2.0.6 (running on Solaris 2.9) and I wonder if one of you can help.
I am running query, this query is doing something like âselect * from x where y between z and wâ.
x, y, z and w are parameters which cause the query to be one that scans a lot of data.
I run the query twice and the first time takes 60 seconds, but the second time takes only 3 seconds.
I assumed that this is caused by the database cache (block buffers).
BUT,
Then I bounced the database (shutdown immediate + startup) and rerun the query.
It comes back after 3 seconds again!!!
Can some share some info on this; it looks like Oracle cache is still there after I restart the Oracle server.
Tal Olier ([email protected]).
Regarding the buffer cache, it is definitly flushed after database restart.
There can be many factors causing your case:
1. The first time you ran the query, some other process was consuming the server resources.
2. Some other users were running heavy queries.
3. Sudden Heavy network activities.
Q: Did the query, in any time, run in 60 seconds again?
If yes, then further factors should be considered.
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