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RE: Find Difference between 2 Tables, 22 GB each, on unique key

From: VIVEK_SHARMA <VIVEK_SHARMA_at_infosys.com>
Date: Tue, 12 Apr 2005 13:58:36 +0530
Message-ID: <B5587533FCBD4344ADB8290B3EDDA1220404A3E1@kecmsg14.ad.infosys.com>

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

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Received on Tue Apr 12 2005 - 04:34:20 CDT

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