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* Speed up COUNT(*)
>   http://archives.postgresql.org/pgsql-hackers/2005-11/msg00943.php
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Bruce Momjian
2006-10-24 02:41:22 +00:00
parent cfb3a42831
commit 2b1ccefe72
2 changed files with 4 additions and 2 deletions
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@ -2,7 +2,7 @@
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (bruce@momjian.us)
Last updated: Sat Oct 21 13:31:12 EDT 2006
Last updated: Mon Oct 23 22:41:16 EDT 2006
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -960,6 +960,7 @@ Cache Usage
get a count directly from a unique index, but for this to be
faster than a sequential scan it must avoid access to the heap
to obtain tuple visibility information.
http://archives.postgresql.org/pgsql-hackers/2005-11/msg00943.php
* Add estimated_count(*) to return an estimate of COUNT(*)