“BULK COLLECT and FORALL are faster than cursor processing”

Seen in the wild:

SELECT ROWID
BULK COLLECT INTO t_rowids
FROM   my_table
WHERE  ...
FOR UPDATE NOWAIT;

IF t_rowids.COUNT > 0 THEN
   FORALL i IN t_rowids.FIRST..t_rowids.LAST
      DELETE FROM my_table
      WHERE ROWID = t_rowids(i);
END IF;

Of course, we couldn’t just do a “DELETE FROM my_table WHERE …”, could we…

Jeffrey Kemp 18 March 2006

code-snippet-of-the-day / PL/SQL / SQL / what-not-to-do /

About Jeffrey Kemp

Application Designer & Developer at Oracle specialising in Oracle APEX (Application Express), Oracle SQL and PL/SQL. Oracle ACE Alumni ♠️. Piano player, father, husband, Christian. The views expressed on this blog are my own and do not necessarily reflect the views of Oracle.