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Re: Tuning views

From: Jack van Zanen <nlzanen1_at_EY.NL>
Date: Sun, 30 Jun 2002 23:38:19 -0800
Message-ID: <F001.0048C6CE.20020630233819@fatcity.com>


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                                                                                                 
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                      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, WI
USA
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Received on Mon Jul 01 2002 - 02:38:19 CDT

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