"Dario V. Fassi" <[EMAIL PROTECTED]> writes:
> A simple question, we need to migrate many (>20) postgres databases from 
> SQL_ASCII encoding to UNICODE encoding, over a 7.3.6 server.

SQL_ASCII is not an encoding (it's more like the absence of knowledge
about an encoding).  What is the data actually stored as?

> With  Dump/Restore , we get an error (Invalid Unicode) in any field that 
> has a 8 bits character coming from the SQL_ASCII , even setting the 
> client_encoding to WIN, ISO-8859-1,  and others encodings.

It might work to just UPDATE pg_database to set datencoding to the
correct value reflecting what you have actually stored.  You might then
need to REINDEX any indexes on textual columns, but I don't think
anything else would go wrong.

If you have a mishmash of different encodings in a single database, then
of course there is no simple solution; you are in for some pain while
you try to fix the data.

                        regards, tom lane

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