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Home -> Community -> Mailing Lists -> Oracle-L -> Re:Queries over DB Links
Bill,
Queries across DB links are pretty messy. Check Metalink I found some information there, particularly on tuning SQL*Net/Net8. Outside of that there is not too much you can do. One thing you should try to minimize if possible is queries that have a mix of local and remote tables. In that case since the local DB has no idea of what the indexes are on the remote system, it sometimes decides that the best way is to create a temp table locally of all that remote data * then perform the joins. Needless to say that temp table is not indexed.
Dick Goulet
____________________Reply Separator____________________ Author: Bill Becker <beckerb_at_mfldclin.edu> Date: 2/1/2001 9:07 AM
Hello,
We seem to have more and more questions regarding query
performance across DB Links, and how to improve it.
I have the Gurry/Corrigan book, but can't find anything on
this specific topic.
Can anyone point me to a good whitepaper or other article
regarding query performance across DB Links?
Thanks
--
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--
Author: Bill Becker
INET: beckerb_at_mfldclin.edu
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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: ListGuru_at_fatcity.com (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). Received on Thu Feb 01 2001 - 12:19:45 CST
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