Re: ADMIN Migrate postgres databases from SQL_ASCII to UNICODE

Thanks very much to all.
Dario.

Patrice Trognon wrote:

>Hi,
>
>If you have blobs you must split your SQL_ASCII to convert it
>with iconv.
>I export my full database.
>I create a new SQL_ASCII database with only tables that don't
>contains blobs. (db_without_blobs)
>I create a new SQL_ASCII database with only tables that contains
>blobs. (db_with_blobs)
>Export your db_without_blobs.
>convert it with iconv
>Create your UNICODE database.
>import db_without_blobs.
>import db_with_blobs.
>
>It's done.
>
>1) export your database.
>/usr/local/postgres/bin/pg_dump -Fc -v -b -d -U YOUR_LOGIN YOUR_DATABASE > full_database.dump
>
>2) create work database, without blobs.
>/usr/local/postgres/bin/createdb db_without_blobs
>
>3) import all datas
>/usr/local/postgres/bin/pg_restore -d db_without_blobs -Fc -v -U YOUR_LOGIN full_database.dump
>
>4) create work database, with blobs.
>/usr/local/postgres/bin/createdb db_with_blobs
>
>5) import all datas.
>/usr/local/postgres/bin/pg_restore -d db_with_blobs -Fc -v -U YOUR_LOGIN full_database.dump
>
>6) Connect to db_without_blobs and drop all tables with blobs.
>6') Connect to db_with_blobs and drop all tables without blobs.
>
>7) export datas in text mode :
>/usr/local/postgres/bin/pg_dump -Fp -v -i -D -U YOUR_LOGIN db_without_blobs > db_without_blobs.dump
>
>8) convert into UTF-8
>iconv --from-code=ISO-8859-1 --to-code=UTF-8 -o db_without_blobs-utf.dump db_without_blobs.dump
>
>9) Create unicode database.
>/usr/local/postgres/bin/createdb -E UNICODE db_unicode
>
>10) importat UTF-8 datas
>/usr/local/postgres/bin/psql db_unicode < db_without_blobs.dump
>
>11) export datas with blobs in binary format.
>12) import this dump info db_unicode .
>
>Best Regards,
>
>Patrice Trognon.
>
>
>
>
>
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>
>>Ð’ Ð’Ñк, 18.07.2004, в 01:34, Dario V. Fassi пишет:
>>
>>
>>>Tom Lane wrote:
>>>
>>>
>>>>"Dario V. Fassi" <software(at)sistemat(dot)com(dot)ar> 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.
>>>>
>>>>
>>>>
>>>Yes you are right , the original data come from a DB2 with CodePage
>>>IBM-850 and was inserted without complains in a Postgres 7.3.6 with
>>>SQL_ASCII.
>>>
>>>Now we are in a Jail , because IBM-850 , isn't WIN, isn't ISO-xx ,
>>>isn't no one postgresql's encoding.
>>>So when in change via pg_databases the encoding , 8 bits characters
>>>become garbage.
>>>More even if we accept this garbage chars and we set encoding to e.g.
>>>ISO-8859-1 it's impossible go to a UNICODE because this garbage
>>>chars are invalid in client's encoding , so they are reject (in
>>>translation process as invalid unicode chars).
>>>
>>>
>>You can dump the data, convert it with for example iconv and then load
>>the data again.
>>
>>--
>>Markus Bertheau <twanger(at)bluetwanger(dot)de>
>>
>>