RE: Speed up Truncate tables

From: Mercadante, Thomas F <NDATFM_at_labor.state.ny.us>
Date: Wed, 15 Aug 2001 12:32:49 -0700
Message-ID: <F001.0036BEE2.20010815123454@fatcity.com>

Cool! I just tried it - works like a charm!

Tom Mercadante Oracle Certified Professional

-----Original Message-----From: Riyaj_Shamsudeen_at_i2.com [mailto:Riyaj_Shamsudeen_at_i2.com]Sent: Wednesday, August 15, 2001 4:02 PMTo: Multiple recipients of list ORACLE-LSubject: RE: Speed up Truncate tablesNot true, at least in 8i. Using 'alter table move ' you could change the initial extent size.. <FONT face=sans-serif

  size=2>SQL>alter table test move storage (initial 2M); <FONT 
  face=sans-serif size=2>Table altered. <FONT face=sans-serif 
  size=2>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 


        <cspence_at_FuelSpot.com> <FONT face=sans-serif 

        size=1>Sent by: root_at_fatcity.com 
        08/15/01 02:22 PM <FONT 
        face=sans-serif size=1>Please respond to ORACLE-L 
              <FONT 
        face=sans-serif size=1>        To:     
           Multiple recipients of list ORACLE-L 


        <ORACLE-L_at_fatcity.com> <FONT face=sans-serif 

        size=1>        cc:       
                
          Subject:        RE: Speed up Truncate 
        tables<FONT face="Courier New"

size=2>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. Spence Oracle 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_at_asiaonline.netFat City Network Services -- (858) 538-5051 FAX: (858) 538-5051San Diego, California -- Public Internet access / Mailing

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