Re: SQL statement over 500% slower with 9.2 compared with 9.1

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On 08/27/2013 11:27 PM, Tomas Vondra wrote:
[............]

> I don't immediately see where's the problem - maybe some other
> hacker on this list can. Can you prepare a testcase for this? I.e.
> a structure of the tables + data so that we can reproduce it?
>

Hello

Of course, you can download a SQL dump of the tables involved, here:
http://folk.uio.no/rafael/filmdatabase_testcase.sql.gz

This file is 357M gunzipped and 101M gzipped. When restored in a
database it will use 1473MB.

# \d+
List of relations
Schema | Name | Type | Owner | Size | Description
- --------+-------------------+-------+----------+--------+-------------
public | filmitem | table | postgres | 41 MB |
public | filmparticipation | table | postgres | 540 MB |
public | person | table | postgres | 85 MB |
(3 rows)

[dbpg-hotel-utv:5432/postgres(at)fdb_testcase][]# \di+
List of relations
Schema | Name | Type | Owner |
Table | Size | Description
-
--------+--------------------------------+-------+----------+-------------------+--------+-------------
public | filmitempkey | index | postgres | filmitem
| 26 MB |
public | filmparticipationfilmidindex | index | postgres |
filmparticipation | 232 MB |
public | filmparticipationpersonidindex | index | postgres |
filmparticipation | 232 MB |
public | filmparticipationpkey | index | postgres |
filmparticipation | 232 MB |
public | personlastnameindex | index | postgres | person
| 41 MB |
public | personpkey | index | postgres | person
| 37 MB |

regards,
- --
Rafael Martinez Guerrero
Center for Information Technology
University of Oslo, Norway

PGP Public Key: http://folk.uio.no/rafael/
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