Re: [GENERAL] Convert from LATIN9 to UTF-8 / WAL Replication

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От Magnus Hagander
Тема Re: [GENERAL] Convert from LATIN9 to UTF-8 / WAL Replication
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Msg-id CABUevEx1GKw9J+pZLRE1gJCBbsz32_MLPUB99WqYPb-tZ9JH5g@mail.gmail.com
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Ответ на Re: [GENERAL] Convert from LATIN9 to UTF-8 / WAL Replication  (Fabrízio de Royes Mello <fabrizio@timbira.com.br>)
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On Wed, May 10, 2017 at 5:05 AM, Fabrízio de Royes Mello <fabrizio@timbira.com.br> wrote:

Em ter, 9 de mai de 2017 às 17:40, basti <mailinglist@unix-solution.de> escreveu:
Hello,

I must convert a Latin9 Pg-cluster (Version 9.1) in utf-8 with minimal
downtime, if possible.
My idea is to use WAL replication for that.
Is it usable for that or in other words, can WAL Replication handle
different encoding on master/slave?

Short answer: no!


Is there perhaps an other way to do that?

I never tried it, but you can use some logical replication tool like Slony.


Is it possible to use on Master Version 9.1 and on Slave 9.6 (it will
get the new master in the next step)?


Unfortunately no because on 9.1 version we don't have support for logical replication yet. We start supporting it since 9.4 using pglogical extension. As I said before you should consider use one external replication tool like Slony to do this job.


In a scenario like this it might also be worth upgrading to 9.6 using pg_upgrade while maintaining the latin9 encoding, and then do a second migratino which changes the encoding from 9.6 w latin9 to 9.6 w utf8. That way you can get access to the newer tools such as pglogical to help you do that. 

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