Re: database not using indexes

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Ok,

the problem was  on a big table on query like this:

select outmessage0_.out_msg_id as out1_0_
from edi.out_messages outmessage0_, edi.transaction_set_partners transactio1_
where outmessage0_.transaction_set_partner=transactio1_.trn_set_prtn_id
and outmessage0_.status_id='TOSND'
and transactio1_.legacy_sender_id='ALL'
and transactio1_.legacy_receiver_id='00004542'
and outmessage0_.transaction_set_id='INTERNAL_USE'
order by outmessage0_.out_msg_id


the existing indexes on status_id
CREATE INDEX out_msg_status_idex
  ON edi.out_messages
  USING btree
  (status_id);

 and transaction_set_partners

CREATE INDEX edi_out_messages_trn_set_prtn_id_fk_idx
  ON edi.out_messages
  USING btree
  (transaction_set_partner);

where not used anyore.

I created the following one:

 CREATE INDEX out_msg_status_trn_set_prtn_idx
  ON edi.out_messages
  USING btree
  (status_id,transaction_set_partner);

and still the explain show a seq scan

then I inverted the fields and now it works:

  CREATE INDEX out_msg_status_trn_set_prtn_idx2
  ON edi.out_messages
  USING btree
  (transaction_set_partner,status_id);



I wonder why not use anymore the existing indexes.

regards


Il 09/11/2011 16.58, Ruslan A. Bondar ha scritto:
Why have you decided it isn't using indexes?
If index exists - postgres will use it.
To write a script for this I need at least database version.

On Wed, 09 Nov 2011 16:22:20 +0100
Silvio Brandani<silvio.brandani@xxxxxxxxxxx>  wrote:

Our database seems not using index anymore, please help with, is a
production database.

is there a script to check missing index on foreign key ??

thanks a lot

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