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SQL Scripts & Samples

Posted Sep 30, 2004

Update/Delete from huge tables with intermediate commits

By DatabaseJournal.com Staff



>>Script Language and Platform: SQL
If Database is in Archive log mode then look for archive generation.

Author: Susmit Sarkar


rem Usage: UPDATE/DELETE in a loop and commit very n records
rem =======================================

declare
  r number := 0;
 cursor cursor_name
 is SELECT rowid, t.column_name FROM table_name t WHERE column_name = 'value';
begin
 for x in cursor_name
 loop
      update table_name set column_name = 'value2'
             where rowid = x.rowid;
      r := r + 1;              -- Commit after every 1000 records
      if mod(i, 1000) then
         commit;
      end if;
  end loop;
  commit;
end;
/

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