Обсуждение: Commiting after certain no of rows have been deleted

Smita Mahadik wrote:
> Hi,
> 
> In my application I m deleteing large no of rows from table based on
> certain condition. This takes lot of time and if sometimes my
> application fails it starts all over again...since the coomit is done
> at the end of transactions. Is there a way i can do commit when
> certain no of rows have been deleted? For eg if i need to delete 2
> million rows i should be able to commit after say 10,000 rows.

No - the whole point of the transaction is it all works or none of it 
does. But, if you have a suitable ID/Name/timestamp/other varying column 
you can break it into smaller chunks:

DELETE FROM contacts WHERE surname LIKE 'A%';
DELETE FROM contacts WHERE surname LIKE 'B%';
...etc... don't forget a final "full" delete to catch anything you miss
DELETE FROM contacts;

Ideally you'll have something with an index on it.
--   Richard Huxton  Archonet Ltd