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Re: Duplicate Index Creation

From: Raghavendra <raghavendra(dot)rao(at)enterprisedb(dot)com>
To: Samuel Stearns <SStearns(at)internode(dot)com(dot)au>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "pgsql-admin(at)postgresql(dot)org" <pgsql-admin(at)postgresql(dot)org>
Subject: Re: Duplicate Index Creation
Date: 2012-07-03 15:15:37
Message-ID: CA+h6AhhXS30eiX9LCxtqkJ5C=UHkN_HCXumoWR1qh_xx8LK5VA@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-admin
On Tue, Jul 3, 2012 at 12:48 PM, Samuel Stearns
<SStearns(at)internode(dot)com(dot)au>wrote:

>  Before and after analyze:****
>
> ** **
>
> select schemaname,relid,indexrelid,relname,indexrelname from****
>
> pg_stat_all_indexes where relname='input_transaction_snbs';****
>
> ** **
>
> schemaname |   relid   | indexrelid |        relname         |
> indexrelname****
>
>
> ------------+-----------+------------+------------------------+----------------------------------
> ****
>
> snbs       | 535026046 |  616672654 | input_transaction_snbs | i1****
>
> snbs       | 535026046 |  616576519 | input_transaction_snbs |
> input_transaction_snbs_prod_pkey****
>
> (2 rows)****
>
> ** **
>
>
> -------------------------------------------------------------------------------------------------------------------------------
> ****
>
> **
>

Seems only one "i1" index here. Because pg_stat_all_indexes view is based
on pg_class,pg_index and pg_namespace catalog tables.

SELECT idstat.schemaname AS schema_name,****
>
>        idstat.relname AS table_name,****
>
>        idstat.indexrelname AS index_name,****
>
>        idstat.idx_scan AS times_used,****
>
>        idstat.idx_scan AS times_used,****
>
>        pg_size_pretty(pg_relation_size(idstat.relid)) AS table_size,****
>
>        pg_relation_size(indexrelid) AS index_size,****
>
>        n_tup_upd + n_tup_ins + n_tup_del as num_writes****
>
> FROM pg_stat_user_indexes AS idstat****
>
> JOIN pg_indexes ON indexrelname = indexname****
>
> JOIN pg_stat_user_tables AS tabstat ON idstat.relid = tabstat.relid****
>
> WHERE idstat.relname = 'input_transaction_snbs'****
>
> AND indexdef !~* 'unique'****
>
> ORDER BY index_size desc;****
>
> ** **
>
> schema_name |       table_name       | index_name | times_used |
> table_size | index_size | num_writes****
>
>
> -------------+------------------------+------------+------------+------------+------------+------------
> ****
>
> snbs        | input_transaction_snbs | i1         |          0 | 2932
> MB    |  304242688 |   10350357****
>
> snbs        | input_transaction_snbs | i1         |          0 | 2932
> MB    |  304242688 |   10350357****
>
> (2 rows)****
>
> **
>

Ok. A small correction to above query, added schema filter clause in JOIN
and indexrelid column. Please try.

SELECT idstat.indexrelid as indexrelid,
       idstat.schemaname AS schema_name,
       idstat.relname AS table_name,
       idstat.indexrelname AS index_name,
       idstat.idx_scan AS times_used,
       idstat.idx_scan AS times_used,
       pg_size_pretty(pg_relation_size(idstat.relid)) AS table_size,
       pg_relation_size(indexrelid) AS index_size,
       n_tup_upd + n_tup_ins + n_tup_del as num_writes
FROM pg_stat_user_indexes AS idstat
JOIN pg_indexes as pi ON indexrelname = indexname and idstat.schemaname =
pi.schemaname
JOIN pg_stat_user_tables AS tabstat ON idstat.relid = tabstat.relid
WHERE idstat.relname = 'input_transaction_snbs'
AND indexdef !~* 'unique'
ORDER BY index_size desc;

--Raghav

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