Date: Thu, 8 Oct 2015 19:32:06 +0200
From: hubert depesz lubaczewski <depesz@depesz.com>
To: "rafael.burischipfer" <RAFAEL.BURISCHIPFERUSA@GMAIL.COM>
Cc: pgsql-admin@postgresql.org
Subject: Re: Doubts PostgreSQL
Message-ID: <20151008173206.GA30897@depesz.com>
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On Thu, Oct 08, 2015 at 07:35:32AM -0700, rafael.burischipfer wrote:
> 1) Can I archive different databases in different directory path?
> Example:
> I want archive the database production 1 in '/mnt/production_1/archive' and
> production 2 in '/mnt/production_2/archive'

if you mean:
a. archive as in "archive_command"
b. database as in one of databases in given pg installation
then no, you can't. wal is shared across all databases in cluster
(installation).

> 2) I want change the WAL location, I don't want the WAL files stay in
> default location, I want for example in '/PGDATA/WAL', and Can I create
> different WALs to different databases?

You can move wal, and then symlink pg_xlog directory, sure.
You can't have wal for different databases go to different directories.

> 3) Can I improve the WAL size? the default is 16,384 KB, I want for example
> 51,200 KB it is possible?

First - why do you think it would be improvement?

> 4) In my instance I have three databases (Production 1, Production 2 and
> Production 3), and I have a role named UserProd with password 'test123', I
> want the Production 1 database the password be 'passwd123' in Production 2
> database be '123-passwd' and in Production 3 database be 'test123', it is
> possible?

User accounts are shared across all databases in cluster. Why not use
separate accounts, then?

Also, while I'm asking - why do you want to move wal to another
location?

Best regards,

depesz

-- 
The best thing about modern society is how easy it is to avoid contact with it.
                                                             http://depesz.com/


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