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04-20-2008, 11:17 AM
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 RE: Checking indexes after large deletes "Onstat -g btc" must be a V10 feature, I don't have it available on my V9.4 instance. -----Original Message----- From: informix-list-bounces@iiug.org [mailto:informix-list-bounces@iiug.org] On Behalf Of Art S. Kagel Sent: Tuesday, June 06, 2006 3:16 PM To: informix-list@iiug.org Subject: Re: Checking indexes after large deletes bozon wrote: > Good idea to drop the index first. In general this is what I do, but > this process is part of a job that removes customer data for > customers that no longer use our product. It is part of a monthly > cleanup and it happens while the instance is on line. > > So is there a way to know if the cleaner is keeping up and > restructuring the indexes (by removing the keys that are marked > deleted and then reorganizing the nodes to rebalance the B-Tree? onstat -g btc Will show you what index pages have been marked for cleaning. If you see a preponderence of pages for a single partnum (index or index fragment) that would be a candidate for a rebuild if you cannot wait for the Btree Cleaners to catch up. Art S. Kagel > Marco Greco wrote: > >>bozon wrote: >> >>>Is there a way to determine how "messed up" an index is after a large >>>number of deletes have been done to a table? I searched here and >>>didn't see anything. Is there an oncheck command or sysmaster table >>>to look at? If so what values should I look for? I have to make a >>>case for rebuilding indexes and having hard data would make my case stronger. >>> >>>Thanks. >>> >>>_____________________________________________ __ >>>Informix-list mailing list >>>Informix-list@iiug.org >>>http://www.iiug.org/mailman/listinfo/informix-list >>> >> >>Why rebuild the index after you have gone through the effort of >>marking all those keys as deleted? drop the index first. >>Caveat: if you are using the index to drive the delete, that might not >>be a good idea... >> >>-- >>Ciao, >>Marco >>________________________________________________ ______________________ ________ >>Marco Greco /UK /IBM Standard disclaimers apply! >> >>Structured Query Scripting Language http://www.4glworks.com/sqsl.htm >>4glworks http://www.4glworks.com >>Informix on Linux http://www.4glworks.com/ifmxlinux.htm > > _______________________________________________ Informix-list mailing list Informix-list@iiug.org http://www.iiug.org/mailman/listinfo/informix-list      |
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