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Re: [ODBC] catastrophic error

From: Marko Ristola <marko(dot)ristola(at)kolumbus(dot)fi>
To: Joel Fradkin <jfradkin(at)wazagua(dot)com>
Cc: 'Bricklen Anderson' <BAnderson(at)PresiNET(dot)com>,pgsql-odbc(at)postgresql(dot)org, pgsql-admin(at)postgresql(dot)org
Subject: Re: [ODBC] catastrophic error
Date: 2005-05-12 21:58:03
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-adminpgsql-odbc
About ASCII to Unicode conversion (if you have only Latin1 characters in 
the database):

Here is a receipt, how you can do a charset conversion from SQL_ASCII into
UNICODE on the Linux side:
(check these from manual pages first!):

1. Stop PostgreSQL and make a good backup!
"su - postgres" ; "pg_dumpall -D > everything-latin1.dump"
"file everything-latin1.dump" might tell you the charset.
Watch out for \345 style octal numbers, because iconv character 
converter won't see them.
PostgreSQL protects non-ascii characters that way at least in ASCII backups.

(The -D above makes the restore phase slow. I use it if I switch a 
PostgreSQL version,
because the rows are standard SQL sentences. Very portable.
The slowness can be resolved at least by filtering the
file with AWK and combining many inserts into a single transaction
(BEGIN,many inserts, COMMIT). )

cat everything-latin1.dump | iconv -f LATIN1 -t  UTF-8 > 
stop PostgreSQL.
remove the old database
Check PostgreSQL configuration files!
su - postgres
initdb with UTF-8.
su - postgres ; psql -f everything-utf8.dump template1

Please check the above phases, but that is approximately, how it goes.
Additional documentation: man pg_dumpall, man initdb, man createdb, man 
psql, man iconv

Database speed:
speed loader format is fastest on restore (pg_dumpall without -D).
Inserts within reasonable sized transactions are lots
of faster than inserts in autocommit mode (pg_dumpall with -D).

Good night.

Marko Ristola

Joel Fradkin wrote:

>The catastrophic error was the actual text sent from the IIS component
>SO I am not 100% sure what it means, I believe it is just mirroring back
>text from the dbserver when trying to connect and failing.
>I am guessing it is odbc and I am currently using the 7.4 version, but am
>looking for the best way to move from SQL_ASCHII to UNICODE (maybe a backup
>and restore using some kind of params? I hope?
>If not I guess I could alter my original program that read MSSQL to read
>from postgres and write it back to a Unicode database and see if the odbc
>drivers are ok (it originally blew up and that's how I ended up using
>Joel Fradkin
>What does a catastrophic error consist of? Do you mean your IIS servers
>could no longer connect to the db, and yet you _could_ connect to the db via
>pgadmin? Yes the web interface gave that as the conection error string (my
>error routine just prints that to the screen)
>I would have thought that rebooting the IIS would have solved any
>connectivity issues (assuming that that is the error that you are getting).
>I've never used IIS, so I can't even guess about that. ODBC is a
>possibility, I suppose, and it certainly wouldn't hurt to try again on the
>ODBC list.

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