Re: Which is th Driving Table ? - basic SQL Qs

'TD_ACCT_MASTER_MOD_TABLE' The query scans this table.

For each accepted row it acquires data from

    'GENERAL_ACCT_MAST_TABLE'
by way of index

    OF 'IDX_GENERAL_ACCT_MAST_TABLE' (UNIQUE) Each row in the result set is then checked twice (probably a pair of existence clauses) against a table whose name is not in the plan because in both cases the checks are complete through index:

    'IDX_SOL_ID_SET_TABLE' The row set that gets through both test is then subject to sorting for an ORDER BY clause.

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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The Co-operative Oracle Users' FAQ
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• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: 17 April 2003 08:43

>
> Which is th Driving Table in the following SQL Query ? Why ?
>
> Execution Plan
> ----------------------------------------------------------
> 0 SELECT STATEMENT Optimizer=RULE
> 1 0 SORT (ORDER BY)
> 2 1 FILTER
> 3 2 NESTED LOOPS
> 4 3 TABLE ACCESS (FULL) OF 'TD_ACCT_MASTER_MOD_TABLE'
> 5 3 TABLE ACCESS (BY INDEX ROWID) OF
'GENERAL_ACCT_MAST_
> TABLE'
>
> 6 5 INDEX (UNIQUE SCAN) OF
'IDX_GENERAL_ACCT_MAST_TABL
> E' (UNIQUE)
>
> 7 2 INDEX (UNIQUE SCAN) OF 'IDX_SOL_ID_SET_TABLE'
(UNIQUE)
> 8 2 INDEX (UNIQUE SCAN) OF 'IDX_SOL_ID_SET_TABLE'
(UNIQUE)
>
> Thanks
>
> --

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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