SQL Tuning
Date: Mon, 2 May 2016 14:14:31 +1000
Message-ID: <CAFeFPA_0bCF4jbw1eMkQAX==fHC27ONefhx_FeCV5gko9U9xfQ_at_mail.gmail.com>
Hi All,
I have two identical databases as far as versions, datasize OS etc is concerned and have a query that produces an identical execution plan. However this part of the 10046 trace is significantly different.
The slow query is on test (first listing) and is severely constricted in its memory so my explanation would be that the tables involved are actually in the buffer cache in prod (second listing) where the sga is much larger and therefore no disk I/O is required.
I will be having a look at the buffer cache next to check what is in there
call count cpu elapsed disk query current
rows
------- ------ -------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.01 0 0 0
0
Execute 1 0.01 0.22 0 0 0
0
Fetch 1 3.74 65.97 30927 68453 0
0
------- ------ -------- ---------- ---------- ---------- ----------
total 3 3.76 66.21 30927 68453 0
0
call count cpu elapsed disk query current
rows
------- ------ -------- ---------- ---------- ---------- ----------
Parse 1 0.00 0.02 0 8 0
0
Execute 1 0.01 0.01 0 83 0
0
Fetch 1 0.32 0.53 0 68507 0
0
------- ------ -------- ---------- ---------- ---------- ----------
total 3 0.34 0.57 0 68598 0
0
Jack van Zanen
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-- http://www.freelists.org/webpage/oracle-lReceived on Mon May 02 2016 - 06:14:31 CEST