From lisa.koivu@efairfield.com Thu, 16 Aug 2001 08:30:30 -0700 From: "Koivu, Lisa" Date: Thu, 16 Aug 2001 08:30:30 -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 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 Koivu Oracle Database Administrator Fairfield Resorts, Inc. 954-935-4117 -----Original Message----- From:   Grabowy, Chris [SMTP:cgrabowy@fcg.com] Sent:   Wednesday, August 15, 2001 5:20 PM To:     Multiple recipients of list ORACLE-L Subject:        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 PM To: Multiple recipients of list ORACLE-L Subject: RE: Speed up Truncate tables Cool!  I just tried it - works like a charm!   Tom Mercadante Oracle Certified Professional -----Original Message----- From: Riyaj_Shamsudeen@i2.com [mailto:Riyaj_Shamsudeen@i2.com] Sent: Wednesday, August 15, 2001 4:02 PM To: Multiple recipients of list ORACLE-L Subject: 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.. Thanks Riyaj "Re-yas" Shamsudeen Certified Oracle DBA i2 technologies   www.i2.com         Christopher Spence Sent by: root@fatcity.com 08/15/01 02:22 PM Please 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 extent without dropping the table. "Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes." Christopher R. Spence Oracle DBA Phone: (978) 322-5744 Fax:    (707) 885-2275 Fuelspot 73 Princeton Street North, Chelmsford 01863 -----Original Message----- Sent: Wednesday, August 15, 2001 3:07 PM To: Multiple recipients of list ORACLE-L Thomas, are your sure you can change the initial extent?  My senior dba told me once it is not possible; you have to drop and recreate table if there is a need to change Initial extent. I am going to play with it today. -----Original Message----- Sent: Wednesday, August 15, 2001 1:27 PM To: Multiple recipients of list ORACLE-L Chuan, Kevin is correct.  If your truncate table is taking a *long* time (and the table is not locked by another process), it's because your storage params are 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 you load the data. You can modify the INITIAL extent by issuing an 'alter table allocate extent(size x)' command to grow the INITIAL extent.   You can also modify the NEXT extent by issuing an 'alter table storage (next x)' command to change the NEXT extent. hope this helps. Tom Mercadante Oracle Certified Professional -----Original Message----- Sent: Wednesday, August 15, 2001 11:02 AM To: Multiple recipients of list ORACLE-L I had the same problem when truncating a huge table (24 Mill rows).   It turned out that the reason my table was taking so long was the amount of extents I had on it.  I could look at what was actually happening during a truncate and it had to go and take each individual block and put them back in the available lists.   Well, after changing the settings on the table to make larger extents (and therefore 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 you do have on that table. -----Original Message----- Sent: Wednesday, August 15, 2001 3:10 AM To: Multiple recipients of list ORACLE-L Hi All,    Is there any way to speed up the truncating a big table with 12 million rows? Basically, I implemented truncating that big table on Production, but it affected the performance much, so I had to stop it in the middle of way. All the rows were truncated but the HWM was not shrunk at all. I want to do it again to get the space back. Is there any way to speed up this process? Platform: Oracle EE8.0.6 and Solaris 2.7 Thanks a lot in advance. Chuan -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Chuan Zhang  INET: chuan@asiaonline.net 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@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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Kevin Lange  INET: kgel@ppoone.com 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@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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Mercadante, Thomas F  INET: NDATFM@labor.state.ny.us 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@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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author:  INET: lhoska@calibresys.com 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@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). -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Christopher Spence  INET: cspence@FuelSpot.com 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@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).