Oracle-L: SQL giving problem over the database link

From: Mandal, Ashoke <ashoke.k.mandal_at_medtronic.com>
Date: Mon, 22 Apr 2002 07:48:29 -0800
Message-ID: <F001.0044AED8.20020422074829@fatcity.com>

Greetings,

Here is the scenario.

We are trying to insert records into a remote table via database link after selecting the data locally.

This query hangs for ever:

INSERT INTO FWVERID.fwlot_pn2m_at_TFWVERID.PACING.MEDTRONIC.COM SELECT * FROM FW.FWLOT_PN2M WHERE FW.FWLOT_PN2M.fromid =

(select fw.fwlot.sysid from fw.fwlot where fw.fwlot.appid = '2000005956');

select fw.fwlot.sysid from fw.fwlot where fw.fwlot.appid = '2000005956' : This query returns only one row.

SELECT * FROM FW.FWLOT_PN2M WHERE FW.FWLOT_PN2M.fromid = (.....) : This select returns 15 rows.

If I replace the subquery as follows then it works great :

INSERT INTO FWVERID.fwlot_pn2m_at_TFWVERID.PACING.MEDTRONIC.COM SELECT * FROM FWLOT_PN2M WHERE fromid = '00000e31.900fb406.37bc1803.00003074.2026';

I tried to do the same insert locally and it works great :

INSERT INTO fwlot_pn2m_gene
SELECT * FROM FW.FWLOT_PN2M WHERE FW.FWLOT_PN2M.fromid =
(select fw.fwlot.sysid from fw.fwlot where fw.fwlot.appid = '2000005956');

For some reason the combination of database link and the subquery in the select clause is going for full table scan for each occurence of formid. I am wondering if this is a bug or something against the rule. WHERE FW.FWLOT_PN2M.fromid =

(select fw.fwlot.sysid from fw.fwlot where fw.fwlot.appid = '2000005956');

Any explanation or help is appreciated.

Thanks,
Ashoke

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Author: Mandal, Ashoke
  INET: ashoke.k.mandal_at_medtronic.com

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Received on Mon Apr 22 2002 - 10:48:29 CDT