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RE: Speed up Truncate tables - rebuild index

From: Ron Rogers <RROGERS_at_galottery.org>
Date: Thu, 16 Aug 2001 10:08:08 -0700
Message-ID: <F001.0036D7F2.20010816101714@fatcity.com>

I think that the reference to "build the indexes" referres to the moving of the table and not the truncating. I believe that the indexes become invalid after for move a table and have to be rebuild. Oracle looses the "link" to the tables location when it is moved. Like someone moving your car while you are at work. You have to be informed where it is.
ROR mm

>>> lisa.koivu_at_efairfield.com 08/16/01 12:20PM >>> 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_at_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_at_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_at_i2.com
> [mailto:Riyaj_Shamsudeen_at_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 <cspence_at_FuelSpot.com>
> Sent by: root_at_fatcity.com
>
> 08/15/01 02:22 PM
> Please respond to ORACLE-L
>
>
>
> To: Multiple recipients of list ORACLE-L
> <ORACLE-L_at_fatcity.com>
> 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_at_asiaonline.net
>
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--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Ron Rogers
  INET: RROGERS_at_galottery.org

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
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Received on Thu Aug 16 2001 - 12:08:08 CDT

Original text of this message

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