Statistics can in fact hurt. If your queries are tuned for rule based
optimizer, it is very possible that cost base will perform suboptimal,
perhaps a little, perhaps a lot. You may need to tune the database to be
more efficient for CBO by changing parameters.
Although adding statistics and removing them if it doesn't work won't hurt a
thing, is a good thing to try. Just noting that statistics can degrade
performance of a queries/query.
Just something to keep in mind.
"Do not criticize someone until you walked a mile in their shoes, that way
when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Thursday, August 16, 2001 10:54 AM
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
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author:
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the
message BODY, include a line containing: UNSUB ORACLE-L (or the name of
mailing list you want to be removed from). You may also send the HELP
command for other information (like subscribing).
* * * * * Freedom of Information Act Notice * * * * *
The information in this email is subject to the record protection mandated
by 5 United States Code 552(b)(4) and relevant judicial opinions.
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Sherman, Edward
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the
message BODY, include a line containing: UNSUB ORACLE-L (or the name of
mailing list you want to be removed from). You may also send the HELP
command for other information (like subscribing).
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Christopher Spence
INET: [EMAIL PROTECTED]
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
San Diego, California -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
