Re: Why a rebuild speeds up my queries.
- From: "Richard Foote" <richard.foote@xxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 1 Sep 2004 22:22:27 +1000
Hi David,
Your "table fetch continued row" count has certainly plummeted so
something's changed there.
When you say dba_tables shows nothing, you don't by any chance use
dbms_stats to analyze as chain_cnt is only calculated with the "old" analyze
command (else you just get a 0).
In which case, yes, your pctfree is buggered.
Just a thought.
Cheers
Richard
----- Original Message -----
From: "David Sharples" <dsharples@xxxxxxxxxxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Wednesday, September 01, 2004 9:21 PM
Subject: Why a rebuild speeds up my queries.
Hi,
I have a process that overtime slowly gets slower and slower (execution
plans are the same)
A rebuild of the table / index fixes this and makes it go quick again.
I know that we shouldn't need to rebuild things, so I need to know what
is wrong in my setup which is causing this.
The setup is this: oracle 9.2.0.4 on Solaris
Running queries against hashed partitioned table which never get deleted
them, they only get inserted into and then updated a fair amount.
We think it is due to row migration / chained rows but chain count from
dba_tables showed nothing after an analyze.
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