Re: Index update = Delete + insert ?
No - If you update a column that is involved in an index, but the update is a 'no-change' update a) the TABLE row is locked b) undo and redo are generated for the TABLE row but The index is not even visited, let alone locked and modified. Regards Jonathan Lewis http://www.jlcomp.demon.co.uk Coming soon one-day tutorials: Cost Based Optimisation Trouble-shooting and Tuning Indexing Strategies (see http://www.jlcomp.demon.co.uk/tutorial.html ) UK___March 19th USA_(FL)_May 2nd Next Seminar dates: (see http://www.jlcomp.demon.co.uk/seminar.html ) USA_(CA, TX)_August The Co-operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html -Original Message- To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED] Date: 12 February 2003 14:14 Vijay,List When Updating to the Field to the SAME (Previously Existent) Data Value , Does a DELETE RE-Insert of the Same Row to the index happen nevertheless ? -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: Jonathan Lewis 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).
Re: Index update = Delete + insert ?
Effectively so, unless you regularly put the same value back into the index. I haven't verified it, but in this case my understanding is that oracle does not the work at all. Of course, any index operation could invoke more work in terms of re-arranging blocks to keep the validity of the index structure. hth connor --- VIVEK_SHARMA [EMAIL PROTECTED] wrote: Is an index Fields' update actually a DELETE followed by an INSERT of the index row ? -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: VIVEK_SHARMA 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). = Connor McDonald web: http://www.oracledba.co.uk web: http://www.oaktable.net email: [EMAIL PROTECTED] GIVE a man a fish and he will eat for a day. But TEACH him how to fish, and...he will sit in a boat and drink beer all day __ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: =?iso-8859-1?q?Connor=20McDonald?= 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).
RE: Index update = Delete + insert ?
Vijay,List When Updating to the Field to the SAME (Previously Existent) Data Value , Does a DELETE RE-Insert of the Same Row to the index happen nevertheless ? Thanks -Original Message- Sent: Wednesday, February 12, 2003 12:50 PM To: VIVEK_SHARMA Hi Vivek, Index rows are first deleted and then inserted rather than update... regards, Vijaya Chander V.S -Original Message- Sent: Wednesday, February 12, 2003 12:43 PM To: LazyDBA.com Discussion Is an index Fields' update actually a DELETE followed by an INSERT of the index row ? Oracle documentation is here: http://tahiti.oracle.com/pls/tahiti/tahiti.homepage To unsubscribe: send a blank email to [EMAIL PROTECTED] To subscribe: send a blank email to [EMAIL PROTECTED] Visit the list archive: http://www.LAZYDBA.com/odbareadmail.pl Tell yer mates about http://www.farAwayJobs.com By using this list you agree to these terms:http://www.lazydba.com/legal.html -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: VIVEK_SHARMA 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).
