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 approach faster/most efficient way?

1. Select <fieldname> from Table 1 MINUS Select <fieldname> from Table = 2? - If so what would be the consumption of TEMP Tablespace? = Additionally how to=20
2. some Other SQL script=20
3. PL/SQL script
4. Will doing a FULL index ONLY Scan be faster than a FULL Table scan?

=A0

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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