Re: are LIOs always relavent?
- From: "Alex Gorbachev" <gorbyx@xxxxxxxxx>
- To: ryan_gaffuri@xxxxxxxxxxx
- Date: Sun, 2 Jul 2006 20:34:42 +0200
Not an answer to your question directly but, perhaps, you can try to
add one filtering condition to your join query so that it targets
specific partition (you mentioned that all rows in GTT match a single
partition anyway).
Also, do you do any significant amount of parsing? I noticed that
parsing on partitioned objects is somewhat heavier than
non-partitioned (well, at least in 9i). Since you don't have much
difference in CPU consumption - it's probably not the issue.
Perhaps, useful to rerun it with dynamic sampling 1 or 0 and without
bind variable peaking and check if the difference is still there.
I would also check execution plans and see if join order is the same
or look for whatever other variations besides "partition list
iterator". Maybe you can try to collect statistics only globally on
table and not on partition level.
2006/7/1, ryan_gaffuri@xxxxxxxxxxx <ryan_gaffuri@xxxxxxxxxxx>:
The real question is... How can I have a large spike(sometimes double) in LIOs, have the same physical IOs, no additional waits, and at the same time have similiar CPU usage and response time?
--
Best regards,
Alex Gorbachev
http://blog.oracloid.com
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