| From: | Korisk <Korisk(at)yandex(dot)ru> |
|---|---|
| To: | Craig Ringer <ringerc(at)ringerc(dot)id(dot)au> |
| Cc: | Sergey Konoplev <gray(dot)ru(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: hash aggregation |
| Date: | 2012-10-11 15:15:13 |
| Message-ID: | 53981349968513@web6f.yandex.ru |
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| Thread: | |
| Lists: | pgsql-performance |
"IOS scan" ?
Index Only Scan
What's your seq_page_cost and random_page_cost?
hashes=# SELECT name, setting, reset_val FROM pg_settings WHERE setting <> reset_val;
name | setting | reset_val
-------------------------+----------------+-----------
archive_command | (disabled) |
enable_bitmapscan | off | on
enable_indexscan | off | on
enable_seqscan | off | on
log_file_mode | 0600 | 384
random_page_cost | 0.1 | 4
seq_page_cost | 0.1 | 1
transaction_isolation | read committed | default
unix_socket_permissions | 0777 | 511
(9 rows)
Postgresql 9.2.1 was configured and built with default settings.
Thank you.
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