Yes, I think I need to test it for myself and see what I get.
As for the busy table in a production environment [24x7, so there's no time to rebuild the table normally], I've put in a request for 30minutes downtime [I am allowed an occassional 15 to 30 minutes every two months] to rebuild the table. Hemant At 08:33 AM 25-09-02 -0800, you wrote: >Hemant wrote > >> >Therefore, to reduce the contention for the "hot blocks", I decide >to have only 1 row in each block. Normally, with a *NEW* table, >PCTFRE 99 and PCTUSED 1 would ensure that I have only 1 row per block. >But if I have a large number of blocks in a few extents created when >PCTFREE was 40 and PCTUSED 50 or 60. When would these >existing blocks start behaving as if they were created with >PCTFREE 99 and PCTUSED 1 ? >How about new blocks ? Would new [empty] blocks in existing >extents immediately behave such that they allow only one row >per block ? Or would only new blocks in new extents take >the PCTFREE 99 and PCTUSED 1 attributes ? > >> > >I would guess the following Hemant, >After changing the PCTFREE/PCTUSED values I do not think existing blocks >will be changed until sufficient rows are deleted so that a block will be >available on the freelist. >If as you say there is only 1 row to a block then that would need to be >deleted so that the block became available on the freelist >and the new values would apply once a new row was inserted. >Moving on from there it seems logical to me (that may be where I am going >wrong!!) that an existing empty block will have it's values changed and >will remain on the freelist but with revised parameters. I cannot say for >certain without performing some tests but that is my gut feel > >HTH > >John > > > >-- >Please see the official ORACLE-L FAQ: http://www.orafaq.com >-- >Author: > INET: [EMAIL PROTECTED] > >Fat City Network Services -- 858-538-5051 http://www.fatcity.com >San Diego, California -- Mailing list and web hosting services >--------------------------------------------------------------------- >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). Hemant K Chitale My web site page is : http://hkchital.tripod.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Hemant K Chitale INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- 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).
