RE: Slow sql

From: Thomas, Kevin <Kevin.Thomas_at_calanais.com>
Date: Thu, 16 Aug 2001 07:01:53 -0700
Message-ID: <F001.0036D008.20010816071132@fatcity.com>

It can if you table holds in excess of 50 million rows...the time to calculate the
statistics grows with the size of the tables. Although I think you can ask it to
compute statistics on an average of data within a table.

-----Original Message-----

Sent: 16 August 2001 15:54
To: Multiple recipients of list ORACLE-L

Yesterday I had a developer complain about a SQL select statment with subquery that was taking 10 minutes to run. I fixed it by generating new statistics:

ANALYZE TABLE table_name COMPUTE STATISTICS;

It took about an hour and a half to run on this particular table but now the query takes 30 seconds. Give it a try on all the tables in your SQL if you're using cost-based optimizer. It can't hurt.

HTH
Ed

-----Original Message-----

Sent: Thursday, August 16, 2001 5:46 AM
To: Multiple recipients of list ORACLE-L

Hallo you DBA'¨s

Can anyonetell me why this insert statement takes 30-40 minutes to run? What can I do to make it go faster?

insert into varukorgtemp ( varukorgid, ean, anvandarid, lagstapris, varutyp, varunamn, strl, leverantor, varumarke, sortiment,vgrp,vare_snr,varenr,levnr )

        SELECT PBK.VARUKORGEANREL.varukorgid, rik2.vare.ean_nr, 'rsm' ,
           PBK.VARUKORGEANREL.lagstapris, 0, rik2.vare.varenavn,
rik2.vare.str,
           rik2.lev.navn, rik2.vare.hylletxt2,

rik2.vare.sortiment,rik2.art_hierarki.vgrp,

pbk.varukorgeanrel.vare_snr,pbk.varukorgeanrel.varenr,pbk.varukorgeanrel.lev nr

         FROM PBK.VARUKORGEANREL,rik2.vare,rik2.lev,rik2.art_hierarki
         WHERE PBK.VARUKORGEANREL.varukorgid= 39
         AND PBK.VARUKORGEANREL.ean=rik2.vare.ean_nr
         AND RIK2.VARE.ARTNR=RIK2.ART_HIERARKI.ARTNR
         AND rik2.vare.levnr=rik2.lev.levnr
         AND rik2.vare.selskap='11'
         AND rik2.vare.vare_snr=pbk.varukorgeanrel.vare_snr
         AND pbk.varukorgeanrel.varenr=rik2.vare.varenr
         AND pbk.varukorgeanrel.levnr=rik2.vare.levnr
         AND rik2.art_hierarki.sett_id=2

Sincerely

Roland Sköldblom

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Author: Thomas, Kevin
INET: Kevin.Thomas_at_calanais.com

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