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Date: Mon, 18 Jan 2016 20:28:25 -0500
From: Bruce Momjian <bruce@momjian.us>
To: Seb Mel <webmaster@mailz.de>
Cc: pgsql-docs@postgresql.org
Subject: Re: Streaming Replication and Hash Indices
Message-ID: <20160119012825.GV31313@momjian.us>
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On Mon, Jan 18, 2016 at 01:15:28PM +0100, Seb Mel wrote:
> Hi list,
> 
> today i got bitten by the issue that streaming replication does not replicate "hash" indices as those changes are not written to WAL. That fact is documented here:
> http://www.postgresql.org/docs/current/static/indexes-types.html
> 
> But i could not find that information anywhere else like:
> https://wiki.postgresql.org/wiki/Streaming_Replication#Restrictions
> or
> http://www.postgresql.org/docs/current/static/warm-standby.html
> 
> I suppose it would be very helpful to add it there, as the usual policy for "corrupt slave data" is to recreate the slave from a base_backup which would make you into thinking that the issue was fixed. 
> That is wrong though, as it will reappear after some time when the data in the table and the index diverge :)!

We issue a warning on hash index creation in 9.5:

        Issue a warning during the creation of <link
        linkend="indexes-types">hash</> indexes because they are not
        crash-safe (Bruce Momjian)

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

+ As you are, so once was I. As I am, so you will be. +
+ Roman grave inscription                             +


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