Deleting 5 million records(slowness issue)

Question

Hi guys ,
we are trying to delete 5 million records with following query .it is taking more time(more than 2 hours).
delete from <table_name> where date<condition_DT;
FYI
* Table is partioned table
* Primary Key is there
Pls assist us on this .

Answer 1

>
we are trying to delete 5 million records with following query .it is taking more time(more than 2 hours).
delete from <table_name> where date<condition_DT;
FYI
* Table is partioned table
* Primary Key is there
Pls assist us on this .
>
Nothing much you can do.
About the only alternatives are
1) create a new table that copies the records you want to keep. Then drop the old table and rename the new one to the old name. If you are deleting most of the records this is a good approach.
2) create a new table that copies the records you want to keepl. Then truncate the partitions of the old table and use partition exchange to put the data back.
3) delete the data in smaller batches of 100K records or so each. You could do this by using a different date value in the WHERE clause. Delete data < 2003, then delete data < 2004 and so on.
4. If you want to delete all data in a partition you can just truncate the partition. That is the approach to use if you partition by date and are trying to remove older data.