col_1 and col_2 are primary key columns in all 3 tables.
There is no implicit data type conversion.
col_1 is varchar2 and col_2 is varchar2 in all 3 tables.
col width is also same in all 3 tables.
-----Original Message-----
Sent: Monday, January 06, 2003 11:52 PM
To: Gurnani, Manoj
If an implicit data type conversion occurs within the WHERE clause, a Full
Table Scan will always results.
It is equivalent to placing a function on an index.
Are all the columns involved indexed?
----- Forwarded by Charlie Mengler/THD on 01/06/2003 10:15 AM -----
manoj.gurnani@orb
itech.co.in To: Multiple recipients of
list ORACLE-L <[EMAIL PROTECTED]>
Sent by: cc:
[EMAIL PROTECTED] Subject: Prevent FTS
01/06/2003 09:39
AM
Please respond to
ORACLE-L
Hi All,
I've 3 tables table x,y,z
pk of x is (col_1,col_2),pk of y is (col_1,col_2,col_4,col_5),pk of z is
(col_1,col_2)
where clause is :
where x.col_1 = y.col_1
and x.col_2 = y.col_2
and x.col_1 = z.col_1
and x.col_2 = z.col_2
and y.col_1 = z.col_1
and y.col_2 = z.col_2
and x.col_3 in ('val1','val2','val3')
and.....
..
Explain plan shows that there is a FTS of table z .
what can be the reason for this and how to prevent this.
Thanks
Manoj
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