RE: Find Difference between 2 Tables, 22 GB each, on unique key
- From: "Vlado Barun" <vlado@xxxxxxxxxx>
- To: <VIVEK_SHARMA@xxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 12 Apr 2005 09:22:20 -0400
I don't know if it's the fastest way but check
http://www.oracle.com/technology/oramag/oracle/05-jan/o15asktom.html
And search for "Comparing the Contents of Two Tables"
Vlado Barun, M.Sc.
Senior Data Architect, Cadre5
www.cadre5.com
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of VIVEK_SHARMA
Sent: Tuesday, April 12, 2005 4:29 AM
To: oracle-l@xxxxxxxxxxxxx
Cc: oracledba@xxxxxxxxxxx
Subject: RE: Find Difference between 2 Tables, 22 GB each, on unique key
Folks
Need to get=A0the difference records between 2 tables each of size 22GB =
(each containing 32 Million rows). The temp tablespace is 30GB.
Unique index exists on the respective fieldname on which to check for =
difference.
Which of the following approaches is faster/most efficient?
1) Select <fieldname> from Table 1 MINUS Select <fieldname> from Table =
2? - If so what would be the consumption of TEMP Tablespace?=20
Additionally how to concurrently monitor consumption of Temp tablespace =
(used/free) while the job is running?
2) using some Other SQL script
3) using a PL/SQL script
Qs Will doing a FULL index ONLY Scan be faster than a FULL Table scan?
Machine configuration - 4 cpu's and 1GB DIMM RAM.=20
OS version - Unix Sun Solaris machine Version not known.
Oracle version -=A0 8.1
Nature of application -=A0Joins and inserts
production issue -=A0 Yes
Tables being accessed by other applications - YES, during certain time =
slot. We have abt 12-14hrs when they are not touched by any application.
=A0
Thanks
--
//www.freelists.org/webpage/oracle-l
--
//www.freelists.org/webpage/oracle-l
Other related posts:
