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Home -> Community -> Mailing Lists -> Oracle-L -> 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)414-4627<A
href="mailto:ineyman_at_perceptron.com">ineyman_at_perceptron.com
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
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 Koivu Oracle Database
Administrator Fairfield Resorts, Inc.
954-935-4117
-----Original Message----- <FONT
face=Arial size=1>From: <FONT face=Arial
size=1>Grabowy, Chris [SMTP:cgrabowy_at_fcg.com] <FONT face=Arial
size=1>Sent: Wednesday,
size=1>To: <FONT face=Arial
size=1>Multiple recipients of list ORACLE-L <FONT face=Arial
size=1>Subject: <FONT
face=Arial size=1>RE: Speed up Truncate tables
Don't forget to rebuild your
-----Original Message-----<FONT
face=Tahoma size=2>From: Mercadante,
Thomas F [<A
href="mailto:NDATFM_at_labor.state.ny.us">mailto:NDATFM_at_labor.state.ny.us]<FONT
face=Tahoma size=2>Sent: Wednesday,
August 15, 2001 4:35 PM<FONT face=Tahoma
size=2>To: Multiple recipients of list
ORACLE-LSubject:<FONT
face=Tahoma size=2> RE: Speed up Truncate tables<FONT
face=Arial color=#0000ff size=2>Cool! I just tried it - works like a
charm!
Tom Mercadante<FONT
face=Arial>Oracle Certified
Professional
-----Original
Message-----From:<FONT
face=Tahoma size=2> Riyaj_Shamsudeen_at_i2.com [<A
href="mailto:Riyaj_Shamsudeen_at_i2.com">mailto:Riyaj_Shamsudeen_at_i2.com]<FONT
face=Tahoma size=2>Sent: Wednesday,
August 15, 2001 4:02 PM<FONT face=Tahoma
size=2>To: Multiple recipients of
list ORACLE-L<FONT face=Tahoma
size=2>Subject: RE: Speed up
Truncate tables
Not true, at least in 8i. Using 'alter
table move ' you could change the initial extent size..<FONT
face=Arial>SQL>alter
table test move storage (initial 2M);<FONT
face=Arial>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..<FONT
face=sans-serif size=2>ThanksRiyaj "Re-yas" ShamsudeenCertified
Oracle DBAi2 technologies www.i2.com<FONT
face=Arial>
08/15/01 02:22 PM<FONT
face=Arial>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
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:
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Received on Thu Aug 16 2001 - 10:48:48 CDT
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