Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Mailing Lists -> Oracle-L -> RE: deletion of data from a large table

RE: deletion of data from a large table

From: Miller, Jay <JayMiller_at_tdwaterhouse.com>
Date: Thu, 26 Jul 2001 08:10:22 -0700
Message-ID: <F001.003560D9.20010726081555@fatcity.com>

Oops, meant to say "you can RESIZE the
datafile down to 1 Meg after the truncate"

-----Original Message-----
Sent: Thursday, July 26, 2001 11:01 AM
To: Multiple recipients of list ORACLE-L

You would need to drop any foreign key constraints pointing to that table before truncating and then recreate them after reloading the data. If I remember correctly, simply disabling them won't work since Oracle treats Truncate Table the same as Drop Table in many ways. Other constraints (NOT NULL, etc) won't be affected.

Also, depending on the size of your initial extent and the amount of data you have remaining, you might be able to resize the one remaining datafile down after you truncate the table. (e.g., if your initial exent is 5 Meg and you don't anticipate ever having more than 1 Meg of data, you can RESIZE the datafile down to 5 Meg after the truncate).

Jay Miller

-----Original Message-----
Sent: Thursday, July 26, 2001 8:36 AM
To: Multiple recipients of list ORACLE-L

This can be done . But what about the constraints ?

> I think this is happening because when you DELETE data the High Water
> Mark(HWM) is not lowered. Essentially
> you have not gained any freespace. If possible you could export remaining
> data truncate table then re-import.
>
> Correct me if I am wrong here.
>
> Rick
>
> -----Original Message-----
> Sent: Thursday, July 26, 2001 7:41 AM
> To: Multiple recipients of list ORACLE-L
>
>
> Hi All,
> I have deleted 3 lakhs records from a large table. But there is no
effect
> on tablespace i.e. before I delete the data freespace in TS is 100MB ,
after
> deletion also it is showing 100MB. What could be the reason ? How to get
the
> freespace after deleting the data ?
> Thanks
> rukmini
>
>
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Rukmini Devi
> INET: rukmini_at_indbrain.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_at_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: Cale, Rick T (Richard)
> INET: RICHARD.T.CALE_at_saic.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_at_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: Rukmini Devi
  INET: rukmini_at_indbrain.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_at_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: Miller, Jay
  INET: JayMiller_at_TDWaterhouse.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_at_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: Miller, Jay
  INET: JayMiller_at_TDWaterhouse.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_at_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).
Received on Thu Jul 26 2001 - 10:10:22 CDT

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US