Since the PGADmin4 client timed out when creating the index, you picked my 
interest here and i was wondering if the index creation itself had failed... 
but:

\d tmp_outpatient_rev

Indexes:
    "ui_outprev_ptclaimline" UNIQUE, btree (desy_sort_key, claim_no, 
clm_line_num)
    "i_outprev_ptclaim" btree (desy_sort_key, claim_no)

So looks like the indices are file. I am pursuing some of the other 
recommendations you suggested before.


Thank you,

Laurent.

________________________________
From: David Rowley <david.row...@2ndquadrant.com>
Sent: Friday, January 25, 2019 1:55:31 AM
To: Tom Lane
Cc: l...@laurent-hasson.com; pgsql-performa...@postgresql.org
Subject: Re: Zero throughput on a query on a very large table.

On Fri, 25 Jan 2019 at 19:24, Tom Lane <t...@sss.pgh.pa.us> wrote:
> PS: On the third hand, you mention having created new indexes on this
> table with apparently not a lot of pain, which is a tad surprising
> if you don't have the patience to wait for a sort to finish.  How
> long did those index builds take?

It would certainly be good to look at psql's \d tmp_outpatient_rev
output to ensure that the index is not marked as INVALID.


--
 David Rowley                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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