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Re: index: specify sort order?

From: <me(at)alternize(dot)com>
To: "Stephan Szabo" <sszabo(at)megazone(dot)bigpanda(dot)com>
Cc: <pgsql-novice(at)postgresql(dot)org>
Subject: Re: index: specify sort order?
Date: 2005-08-27 16:25:29
Message-ID: 04c601c5ab23$f52eb090$8d02a8c0@iwing (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
hi stephan

yes, analyze is showing "index scan backwards". so for pg-sql it does not 
make a difference in speed whether "index scan" is done forward/backward? 
cool! in mssql it did make quite a difference to specify the prefered index 
sort order, hence my question.

before i annoy the list with other migration-related, obvious questions, is 
there a good documentation on migrating from mssql to pgsql?


----- Original Message ----- 
From: "Stephan Szabo" <sszabo(at)megazone(dot)bigpanda(dot)com>
To: <me(at)alternize(dot)com>
Cc: <pgsql-novice(at)postgresql(dot)org>
Sent: Saturday, August 27, 2005 5:52 PM
Subject: Re: [NOVICE] index: specify sort order?

> On Sat, 27 Aug 2005 me(at)alternize(dot)com wrote:
>> in ms-sql it is possible to specify the default order for an index (i.e.
>> asc/desc). is this possible in pgsql as well, and if yes, how? i have
>> some timestamp indices that i only use to sort the entries in descending
>> sortorder...
> Well, if it's a single column index and sort we should be able to use the
> index backwards to do the sort (Explain would show Index Scan Backwards).
> Can you give more information on what precisely you're doing?
> ---------------------------(end of broadcast)---------------------------
> TIP 2: Don't 'kill -9' the postmaster

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