From cgrabowy@fcg.com Thu, 16 Aug 2001 11:04:20 -0700 From: "Grabowy, Chris" Date: Thu, 16 Aug 2001 11:04:20 -0700 Subject: RE: Speed up Truncate tables - rebuild index Message-ID: MIME-Version: 1.0 Content-Type: text/plain Title: RE: Speed up Truncate tables - rebuild index Yes, the point of my message was simply a quick reminder to rebuild the indexes on a table that has been ALTER TABLE...MOVE moved.   I havent tested this, but I believe Lisa is right, in part, if the table is truncated, then moved, then why bother rebuilding the indexes?  The table is empty.  There are no ROWIDS in the index to worry about.   So sorry, I wasnt following the thread, so again it was just a quick reply...glad it's Friday....errr....never mind....where did I hide that darn bottle? -----Original Message-----From: Koivu, Lisa [mailto:lisa.koivu@efairfield.com]Sent: Thursday, August 16, 2001 1:21 PMTo: Multiple recipients of list ORACLE-LSubject: RE: Speed up Truncate tables - rebuild index Ahhh... Thank you.  Pre-coffee over here. LK -----Original Message----- From:   Igor Neyman [SMTP:ineyman@perceptron.com] Sent:   Thursday, August 16, 2001 12:58 PM To:     Multiple recipients of list ORACLE-L Subject:        Re: Speed up Truncate tables - rebuild index Lisa,   I think Chris referred to 'alter table ... move', in which case you need to rebuild indexes (ROWIDs changed).   Igor Neyman, OCP DBAPerceptron, Inc.(734)414-4627ineyman@perceptron.com <mailto:ineyman@perceptron.com>  ----- Original Message ----- From: Koivu, Lisa <mailto:lisa.koivu@efairfield.com> To: Multiple recipients of list ORACLE-L <mailto:ORACLE-L@fatcity.com> Sent: Thursday, August 16, 2001 12:20 PM Subject: RE: Speed up Truncate tables - rebuild index Actually Chris if you truncate a table, the indexes on the table are truncated right along with it.  You don't end up with a sparse index, like when you delete many rows.  Try it.  I did (8.1.6)  and was very happy to see this behavior.  Lisa KoivuOracle Database AdministratorFairfield Resorts, Inc.954-935-4117 -----Original Message-----From:   Grabowy, Chris [SMTP:cgrabowy@fcg.com]Sent:   Wednesday, August 15, 2001 5:20 PMTo:     Multiple recipients of list ORACLE-LSubject:        RE: Speed up Truncate tables Don't forget to rebuild your indexes... -----Original Message-----From: Mercadante, Thomas F [ <mailto:NDATFM@labor.state.ny.us>]Sent: Wednesday, August 15, 2001 4:35 PMTo: Multiple recipients of list ORACLE-LSubject: RE: Speed up Truncate tablesCool!  I just tried it - works like a charm!  Tom MercadanteOracle Certified Professional -----Original Message-----From: Riyaj_Shamsudeen@i2.com [ <mailto:Riyaj_Shamsudeen@i2.com>]Sent: Wednesday, August 15, 2001 4:02 PMTo: Multiple recipients of list ORACLE-LSubject: RE: Speed up Truncate tables Not true, at least in 8i. Using 'alter table move ' you could change the initial extent size..SQL>alter table test move storage (initial 2M);Table altered.Only catch here is that 'move' command doesn't apply to tables having long ,long raw, LOB etc..Initial extent can be changed for the remaining tables..ThanksRiyaj "Re-yas" ShamsudeenCertified Oracle DBAi2 technologies   www.i2.com         Christopher Spence Sent by: root@fatcity.com 08/15/01 02:22 PMPlease respond to ORACLE-L                To:        Multiple recipients of list ORACLE-L         cc:                Subject:        RE: Speed up Truncate tables    You are correct, unless your using 9i, you cannot alter the initial extentwithout dropping the table."Do not criticize someone until you walked a mile in their shoes, that waywhen you criticize them, you are a mile a way and have their shoes."Christopher R. SpenceOracle DBAPhone: (978) 322-5744Fax:    (707) 885-2275Fuelspot73 Princeton StreetNorth, Chelmsford 01863-----Original Message-----Sent: Wednesday, August 15, 2001 3:07 PMTo: Multiple recipients of list ORACLE-LThomas,are your sure you can change the initial extent?  My senior dba told me onceit is not possible; you have to drop and recreate table if there is a needto change Initial extent. I am going to play with it today.-----Original Message-----Sent: Wednesday, August 15, 2001 1:27 PMTo: Multiple recipients of list ORACLE-LChuan,Kevin is correct.  If your truncate table is taking a *long* time (and thetable is not locked by another process), it's because your storage paramsare incorrect for the amount of data you are holding.Look at initial and next in comparison with the number of extents(DBA_EXTENTS view) for the table in question, and modify them before youload the data. You can modify the INITIAL extent by issuing an 'alter tableallocate extent(size x)' command to grow the INITIAL extent.  You can also modify the NEXT extent by issuing an 'alter table storage (nextx)' command to change the NEXT extent.hope this helps.Tom MercadanteOracle Certified Professional-----Original Message-----Sent: Wednesday, August 15, 2001 11:02 AMTo: Multiple recipients of list ORACLE-LI had the same problem when truncating a huge table (24 Mill rows).   Itturned out that the reason my table was taking so long was the amount ofextents I had on it.  I could look at what was actually happening during atruncate and it had to go and take each individual block and put them backin the available lists.  Well, after changing the settings on the table to make larger extents (andtherefore fewer) the truncates on that table went hundreds of times faster(we had real bad settings on that table before).You might investigate your storage parms and see just how many extents youdo have on that table.-----Original Message-----Sent: Wednesday, August 15, 2001 3:10 AMTo: Multiple recipients of list ORACLE-LHi All,   Is there any way to speed up the truncating a big table with 12 millionrows?Basically, I implemented truncating that big table on Production, but itaffected the performance much, so I had to stop it in the middle of way. Allthe rows were truncated but the HWM was not shrunk at all. I want to do itagain to get the space back. Is there any way to speed up this process?Platform: Oracle EE8.0.6 and Solaris 2.7Thanks a lot in advance.Chuan--Please see the official ORACLE-L FAQ: <http://www.orafaq.com>--Author: Chuan Zhang INET: chuan@asiaonline.netFat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051San Diego, California        -- Public Internet access / Mailing Lists--------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail messageto: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in themessage BODY, include a line containing: UNSUB ORACLE-L (or the name ofmailing list you want to be removed from).  You may also send the HELPcommand for other information (like subscribing).--Please see the official ORACLE-L FAQ: <http://www.orafaq.com>--Author: Kevin Lange INET: kgel@ppoone.comFat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051San Diego, California        -- Public Internet access / Mailing Lists--------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail messageto: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in themessage BODY, include a line containing: UNSUB ORACLE-L (or the name ofmailing list you want to be removed from).  You may also send the HELPcommand for other information (like subscribing).--Please see the official ORACLE-L FAQ: <http://www.orafaq.com>--Author: Mercadante, Thomas F INET: NDATFM@labor.state.ny.usFat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051San Diego, California        -- Public Internet access / Mailing Lists--------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail messageto: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in themessage BODY, include a line containing: UNSUB ORACLE-L (or the name ofmailing list you want to be removed from).  You may also send the HELPcommand for other information (like subscribing).--Please see the official ORACLE-L FAQ: <http://www.orafaq.com>--Author: INET: lhoska@calibresys.comFat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051San Diego, California        -- Public Internet access / Mailing Lists--------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail messageto: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and in themessage BODY, include a line containing: UNSUB ORACLE-L (or the name ofmailing list you want to be removed from).  You may also send the HELPcommand for other information (like subscribing).--Please see the official ORACLE-L FAQ: <http://www.orafaq.com>--Author: Christopher Spence INET: cspence@FuelSpot.comFat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051San Diego, California        -- Public Internet access / Mailing Lists--------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail messageto: ListGuru@fatcity.com (note EXACT spelling of 'ListGuru') and inthe message BODY, include a line containing: UNSUB ORACLE-L(or the name of mailing list you want to be removed from).  You mayalso send the HELP command for other information (like subscribing).