RE: CLRPFM on file that is foreign key

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DeLong, Eric
Sent: Thursday, August 09, 2007 3:09 PM
To: Midrange Systems Technical Discussion
Subject: RE: CLRPFM on file that is foreign key

While that would work, it's not nearly as efficient as the
CLRPFM would be.

Not true with v5r3 and higher.

DELETE Performance: An SQL DELETE statement that does not contain a WHERE clause will delete all rows
of a table. In this case, the rows may be deleted using either a clear operation (if not running under
commitment control) or a change file operation (if running under commitment control). If running under
commitment control, the deletes can still be committed or rolled back. This implementation will be
much faster than individually deleting each row, but individual journal entries for each row will not
be recorded in the journal. This technique will only be used if all the following are true:
v The target table is not a view.
v A significant number of rows are being deleted.
v The job issuing the DELETE statement does not have an open cursor on the file (not including
pseudo-closed SQL cursors). v No other job has a lock on the table.
v The table does not have an active delete trigger.
v The table is not the parent in a referential constraint with a CASCADE, SET NULL, or SET DEFAULT
delete rule.
v The user issuing the DELETE statement has *OBJMGT or *OBJALTER system authority on the table in
addition to the DELETE privilege.

HTH,

Charles


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