You can also use sybase's BCP for some tables, if you know that there's
nothing that needs to be quoted. When I migrated stats.distributed.net
from sybase to pgsql I used both tactics; I bcp'd every table I could,
then used a perl script to copy from sybase to pgsql for tables that had
embedded tabs, linefeeds, etc.
The code I used for our migration is at
http://cvs.distributed.net/viewcvs.cgi/stats-sql/postgresql/. move.pl is
the perl script I used. Since I used BCP for all the really big tables I
just had the perl script insert directly into pgsql, but you could
always have it produce a file that copy could deal with as Josh
mentioned (in fact, you wouldn't even need to write to a file; copy can
read from stdin. This would save time if the amount of downtime for the
migration matters to you.)
On Wed, Feb 11, 2004 at 09:04:14AM -0800, Josh Berkus wrote:
> Ashish,
>
> > postgresql you said (I saw this on a list):
> > > Also, if you have a *running* Sybase database, conversion is a lot
> > > easier ... you can use Perl::DBI to read directly from sybase to a COPY
> > > file, and then load the COPY file into Postgres.
> >
> > I am brand new to postgres and do have a running sybase which I wish to
> > convert. I have used perl's DBlib. However, I am not sure how to get the
> > output to copy. I will also be sending the question to postgres lists, but
> > thought I would send it to you too in case you are able to suggest
> > something.
>
> Easiest way? Use perl to pull from Sybase and build a COPY-formatted file.
> Then have perl log into postgres and load the file. Seems awkward, but it's
> actually *much* faster than other methods. We do this for a 1GB Sybase
> database for one client on a nightly basis; takes about 40 minutes.
>
> --
> Josh Berkus
> Aglio Database Solutions
> San Francisco
>
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>
--
Jim C. Nasby, Database Consultant jim@nasby.net
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