At 12:59 PM 9/10/2003 -0800, you wrote:
DELETE FROM TABLE_MESSAGES WHERE field1 = lrec_icclaims_dtl (i).seq_id AND field2 = lrec_icclaims_dtl (i).seq_id AND type = 'E';
The above code deletes processing messages from a table that may contain upwards of 1,000,000 rows or more. We have a situation where we are inserting 100,000 rows per day into this table. When the above code executes within a package the whole process basically slows to a stop. With the code commented out the process runs. Field1 and Field2 are VARCHAR2(30). seq_id is a NUMBER(9). We believe that Oracle is doing an implicit conversion of the fields when the code is executed and causing the process to slow down dramatically. Without doing an explicit conversion with to_char (), because I believe this will suppress the indexes on field1 and field2, what can be done to make this efficient as possible? Field1 is in 2 indexes and field2 is in 1 index and type is not included in any indexes. Does Oracle suppress the use of indexes when doing an implicit conversion? Can we force index use with this statement:
delete /*+ INDEX(<tablename indexname [indexname]>) */ from table_messages.
This is the first time we have seen this problem with this table.
thanks,
David Ehresmann
Wolfgang Breitling Oracle7, 8, 8i, 9i OCP DBA Centrex Consulting Corporation http://www.centrexcc.com
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