Re: Problems restoring big tables

Hi all,

>> I have to restore a database that its dump using custom format (-Fc)
>> takes about 2.3GB. To speed the restore first I have restored everything
>> except (played with pg_restore -l) the contents of some tables that's
>> where most of the data is stored.
>
> I think you've outsmarted yourself by creating indexes and foreign keys
> before loading the data. That's *not* the way to make it faster.

I made a mistake saying that I wanted to speed the restore. What I
really meant is the following. I have to migrated that DB from a server
to another, that means I have to stop my production environment. Those
big tables are not really needed to be on production as they are only
statistical data. So what I wanted to do is first of all restore the
important tables and at the end restore the statistics.

So what's the way to do this?

>
>> pg_restore: ERROR: out of memory
>> DETAIL: Failed on request of size 32.
>> CONTEXT: COPY statistics_operators, line 25663678: "137320348 58618027
>
> I'm betting you ran out of memory for deferred-trigger event records.
> It's best to load the data and then establish foreign keys ... indexes
> too. See
> http://www.postgresql.org/docs/8.2/static/populate.html
> for some of the underlying theory. (Note that pg_dump/pg_restore
> gets most of this stuff right already; it's unlikely that you will
> improve matters by manually fiddling with the load order. Instead,
> think about increasing maintenance_work_mem and checkpoint_segments,
> which pg_restore doesn't risk fooling with.)

Thank you very much
--
Arnau