pg_restore error

I am trying to load a data base using pg_restore. We are migrating to
a new server and I want to see if I can make the load go faster if I
load with pg_restore instead of psql.

The old server is:
CentOS upgraded to 5.4 64bit with the stock PostgreSQL 8.1.
The dump file was created with:
pg_dump --format=c --file=ec.restore ec
where ec is the name of the database. It is encoded SQL_ASCII. I
plan on converting to UTF-8 but I can't do that quite yet.

The new server is
CentOS 5.4 64 bit with PostgreSQL 8.4 installed from the YUM repo on
the PostgreSQL site.

The restore command is:
createdb -E SQL_ASCII -T template0 ec
pg_restore -dec -j2 ec.restore

I get this error:
pg_restore: [custom archiver] dumping a specific TOC data block out of
order is not supported without ID on this input stream (fseek
required)
pg_restore: [archiver] worker process failed: exit code 1

It seems to run if I ommit the -j2 option. (Though as of this moment
is has not completed). Is there a known problem with using parallel
loading in 8.4 from a file created with an 8.1 database?

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Bryan White

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Re: pg_restore error

Bryan White wrote:
> I am trying to load a data base using pg_restore...... Is there a known problem with using parallel
> loading in 8.4 from a file created with an 8.1 database?
>

It was unclear from your email how you are creating the dump. Did you
create the dump with the 8.1 or the 8.4 version of pg_dump? When
upgrading, the docs recommend using the newer version of the dump
utility: "It is recommended that you use the pg_dump and pg_dumpall
programs from the newer version of PostgreSQL, to take advantage of any
enhancements that might have been made in these programs. Current
releases of the dump programs can read data from any server version back
to 7.0."

How many cores are available on the new server?

Cheers,
Steve


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Re: pg_restore error

Bryan White writes:
> I get this error:
> pg_restore: [custom archiver] dumping a specific TOC data block out of
> order is not supported without ID on this input stream (fseek
> required)

I can't duplicate that here using latest 8.1.x pg_dump and 8.4.x
pg_restore ... what versions are you using exactly? Also, it might
be dependent on the set of objects in your database --- would you
be willing to show us the output of "pg_restore --list ec.restore"?

regards, tom lane

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Re: pg_restore error

On Sat, Apr 17, 2010 at 2:46 PM, Tom Lane wrote:
> Bryan White writes:
>> I get this error:
>> pg_restore: [custom archiver] dumping a specific TOC data block out of
>> order is not supported without ID on this input stream (fseek
>> required)
>
> I can't duplicate that here using latest 8.1.x pg_dump and 8.4.x
> pg_restore ... what versions are you using exactly? =A0Also, it might
> be dependent on the set of objects in your database --- would you
> be willing to show us the output of "pg_restore --list ec.restore"?

I think it was an error on my part. I am retring the whole operation now.


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Re: pg_restore error

> It was unclear from your email how you are creating the dump. Did you create
> the dump with the 8.1 or the 8.4 version of pg_dump? When upgrading, the
> docs recommend using the newer version of the dump utility: "It is
> recommended that you use the pg_dump and pg_dumpall programs from the newer
> version of PostgreSQL, to take advantage of any enhancements that might have
> been made in these programs. Current releases of the dump programs can read
> data from any server version back to 7.0."

I messed up. I sent the stderr output of the dump to a text file and
never looked at it. There was some sort of deadlock condition on a
particular table. Another process tries to drop and recreate a table
during the time of the dump.

I was using the pg_dump from 8.1. I have now dumped the database with
the 8.4 version. It will be a couple hours before I have any results.

> How many cores are available on the new server?

The new server is a dual socket Nahalem. 8 cores, 16 threads, 48 GB
ram, 2 WAL drives in RAID1 and 12 database drives in RAID10.

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Re: pg_restore error

Bryan White wrote:
> ...
> The new server is a dual socket Nahalem. 8 cores, 16 threads, 48 GB
> ram, 2 WAL drives in RAID1 and 12 database drives in RAID10.
>
I would try setting -j higher - in your case try 8 for starters. Also
turn off fsync and autovacuum (and turn them back on !!!). See these and
more tips at:
http://it.toolbox.com/blogs/database-soup/using-84-parallel- restore-with-your-83-or-82-database-31575

Cheers,
Steve




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Re: pg_restore error

On Sat, Apr 17, 2010 at 5:53 PM, Steve Crawford
wrote:
> Bryan White wrote:
>>
>> ...
>> The new server is a dual socket Nahalem. =A08 cores, 16 threads, 48 GB
>> ram, 2 WAL drives in RAID1 and 12 database drives in RAID10.
>>
>
> I would try setting -j higher - in your case try 8 for starters. Also turn
> off fsync and autovacuum (and turn them back on !!!). See these and more
> tips at:
> http://it.toolbox.com/blogs/database-soup/using-84-parallel- restore-with-=
your-83-or-82-database-31575
>

Success. The -j6 run completed. The time to restore went from 152
minutes to 45 minutes. I was already doing some of the things on the
above page. I plan on implementing others and than do a few test runs
to find the optimal number of jobs.

Thanks!

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Bryan White

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