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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Tuning views
Hi
Don't just tune the views but see how they are used by looking in the sql-area views or tracing a session that uses it in the way it's normally used. than tune what you find (if not app created sql this shoud be possible)
Jack
"Jesse, Rich"
<Rich.Jesse_at_QTIWO To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
RLD.COM> cc: (bcc: Jack van Zanen/nlzanen1/External/MEY/NL)
Sent by: Subject: Tuning views
root_at_fatcity.com
28-06-2002 21:56
Please respond to
ORACLE-L
Hey all,
We have a multitable view setup on our 8.1.7.2.0 HP/UX 11.0 DB for
security,
so our users can use <gulp> MS Ack-sess to query a few columns from some
sensitive tables. In other words, the view doesn't filter rows, just
columns. The problem is that the author of the view explicitly set the
RULE
hint and it seems to be causing a few performance problems when joining the
view to other tables.
So, I'll "fix" the view and be the hero, right? <sigh> Well, how do you
tune a multitable view when you don't know how it's going to be used?
After
fixing a little join mishap, I added hints for FIRST_ROWS, as well as FULL
for the super small 1-block tables. This seems to me to be valid, since
the
users of the view will (hopefully) filter the rows based on an index of one
or more of the tables of the view, but I don't really have any proof other
than a pretty-looking explain plan.
Anyone have a philosophy or procedure for tackling something like this? Preferrably one that ends in "drink beer"?
TIA!
Rich Jesse System/Database Administrator Rich.Jesse_at_qtiworld.com Quad/Tech International, Sussex, WIUSA
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