From: | Karl Wright <kwright(at)metacarta(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-admin(at)postgresql(dot)org |
Subject: | Re: Export/import issue/question |
Date: | 2007-06-21 13:58:05 |
Message-ID: | 467A83ED.8000904@metacarta.com |
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Thread: | |
Lists: | pgsql-admin |
Tom Lane wrote:
> Karl Wright <kwright(at)metacarta(dot)com> writes:
>> and then I installed 8.1, and attempted the following:
>> pg_restore --file dbsnapshot --format=t --table=ingeststatus -a
>> But, I get the following error:
>> pg_restore: [tar archiver] could not find header for file toc.dat in tar
>> archive
>
> Oh, I'm overthinking the problem. You left out some details here,
> right? Like it sat and did nothing until you hit control-D?
>
> The above command is wrong because --file is an *output* switch for
> pg_restore --- it would have tried to read a tar archive from stdin,
> and the "could not find header" complaint is what you get when it hits
> immediate EOF and the tar format has been forced on the command line.
> (You would have gotten a more recognizable complaint without --format=t,
> which is redundant anyway.) Fortunately, it doesn't seem to try to
> write the output file right away, so the dumpfile didn't get trashed.
>
> Correct usage would be something like
>
> pg_restore --table=ingeststatus -a dbsnapshot >restore.sql
>
> or add -d etc switches to issue SQL directly to the target database.
>
> regards, tom lane
>
OK - I was able to get this to basically work, although there are two
problems.
First problem: While the total amount of time required to export is
reasonable (30 minutes or so), the time required to pg_restore my whole
set is very large (more than 12 hours). It also errored out on the
largest table:
>>>>>>
localhost:/common# pg_restore --table=hopdeletedeps -a dbsnapshot -d
metacarta -U metacarta
pg_restore: ERROR: out of memory
DETAIL: Failed on request of size 32.
CONTEXT: COPY hopdeletedeps, line 33239560:
"http://boards.nbc.com/nbc/index.php?s=5618dbef4559888cf6c2e9321710a293&act=Login&CODE=04&..."
pg_restore: [archiver (db)] error returned by PQendcopy: ERROR: out of
memory
DETAIL: Failed on request of size 32.
CONTEXT: COPY hopdeletedeps, line 33239560:
"http://boards.nbc.com/nbc/index.php?s=5618dbef4559888cf6c2e9321710a293&act=Login&CODE=04&..."
<<<<<<
New questions:
(a) How do I get around the "out of memory" error for pg_restore? This
is a system with 16GB main memory, with a similar amount of swap space,
so I would find it hard to go to a much larger footprint.
(b) How can I get the restore performance up to the level where it takes
only a couple of hours at most to do this restore?
Thanks,
Karl
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