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From: Alvaro Herrera <[email protected]>
To: Grzegorz Szpetkowski <[email protected]>
Cc: pgsql-docs <[email protected]>
Subject: Re: Default compression level for custom format in pg_dump ?
Date: Mon, 18 Apr 2011 13:46:06 -0300
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Excerpts from Grzegorz Szpetkowski's message of dom abr 17 21:26:02 -0300 2011:

> Then "it goes to" zlib library. According to http://www.zlib.net/manual.html:
> 
> "The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and
> 9: 1 gives best speed, 9 gives best compression, 0 gives no
> compression at all (the input data is simply copied a block at a
> time). Z_DEFAULT_COMPRESSION requests a default compromise between
> speed and compression (currently equivalent to level 6)."
> 
> #define Z_DEFAULT_COMPRESSION  (-1) (zlib.h)
> 
> What do you think about adding some clarification in PostgreSQL doc ?

Can this behavior be tuned externally? Say by an environment var or
something.  If it can, then maybe it's worth documenting it a bit more
fully (including the tuning option).  Otherwise I think the current docs
are enough.

-- 
Álvaro Herrera <[email protected]>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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