Обсуждение: Out of memory error during updating huge table

I'm trying to update a table in transaction mode with
300 million records in it, and I'm getting an out of
memory error.

ERROR: out of memory
DETAIL: Failed on request of size 32.

In transaction mode, I first delete all the records in
the table and then try to use COPY to populate it
again with the new data from a file. The out of memory
error happens during the COPY.

Any thoughts? Is there a way to get around this?
Thanks a lot!

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Gabor Siklos <siklosg@yahoo.com> writes:
> I'm trying to update a table in transaction mode with
> 300 million records in it, and I'm getting an out of
> memory error.

The update per se shouldn't be a problem, but if you have AFTER ROW
triggers on the table then the list of pending trigger events could
be a problem.  Foreign key constraints, in particular, use AFTER
triggers.

> In transaction mode, I first delete all the records in
> the table and then try to use COPY to populate it
> again with the new data from a file. The out of memory
> error happens during the COPY.

If the problem is coming from an FK constraint, you might consider
dropping the constraint and then re-adding it after the COPY.  This'd
probably be faster than checking the rows "retail", too.

            regards, tom lane