Yes, if you are concerned about the performance of updates/deletes on
the departments table. The reason the system doesn't make such an index
automatically is that there are common scenarios where you seldom or
never update the master table, and so the index wouldn't repay the cost
it creates for
Arnau <[EMAIL PROTECTED]> writes:
>> The referencED column is forced to have an index. The referencING
>> column is not. The cases where you need an index on the latter are
>> precisely updates/deletes of the referencED column.
>Lets put an example
>CREATE TABLE departments
>(
>
Hi all,
Maybe the direction this thread has taken is a bit out of the scope
of this mailing list, but I think it's very interesting and can be
useful for newbie users.
The usual cause of slow deletes is that (a) the table is the target of
some foreign key references from other large tabl
Arnau <[EMAIL PROTECTED]> writes:
>> The usual cause of slow deletes is that (a) the table is the target of
>> some foreign key references from other large tables, and (b) the
>> referencing columns in those tables aren't indexed.
>This is a thing I don't understand, as far as I know the forei
Hi all,
The usual cause of slow deletes is that (a) the table is the target of
some foreign key references from other large tables, and (b) the
referencing columns in those tables aren't indexed.
This is a thing I don't understand, as far as I know the foreign keys
references to primary key
adey <[EMAIL PROTECTED]> writes:
> We are attempting many deletes in our production database for the first
> time, and we're getting nowhere fast.
> The SQL runs for more than 12 hours to delete 2 million rows, and hasn't
> finished each time we've tried it as we've had to cancel it.
The usual cau
Please give me some guidance?
We are attempting many deletes in our production database for the first time, and we're getting nowhere fast.
The SQL runs for more than 12 hours to delete 2 million rows, and hasn't finished each time we've tried it as we've had to cancel it.
I have tried running quer
