Question

I have 2 tables, an active table and an inactive table. I want to move rows from the active to the inactive table. My first thought was

insert into inactive select * from active where ... delete from active active where ... 

However about .42 seconds later I noticed this will drop/duplicate rows if updates alter what the where clause selects.

In this case, I can easily prevent that but what should I do in cases where I can’t?

edit: From the answers it look like there isn’t an easy/trivial way to do this. I’m really surprised by this. I would think that there would be some substantial benefits to having it.

Answer 1

Status flags are your friend.

UPDATE old_data SET move='MARKED'; INSERT INTO somewhere... SELECT where move='MARKED'; DELETE FROM old_data WHERE move='MARKED'; 

If you do this with Autocommit off, it will seize locks all over the place.

You can COMMIT after each step, if you want to do a little less locking.