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
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Author: Ehresmann, David
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