diff options
| author | Bruce Momjian <bruce@momjian.us> | 2003-01-28 03:34:29 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2003-01-28 03:34:29 +0000 |
| commit | f21fb30dfcc9da6fa67430ce89d506850ece4f5e (patch) | |
| tree | 003d5b622968dd894eb99eda294bc1ee21b89d42 /doc | |
| parent | bd175cc9fb2c3e45dc7e9b9f0fea7d7396062c3c (diff) | |
Revert optimizer page count change.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/sgml/perform.sgml | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/doc/src/sgml/perform.sgml b/doc/src/sgml/perform.sgml index 2e42d020e42..af7f855a50c 100644 --- a/doc/src/sgml/perform.sgml +++ b/doc/src/sgml/perform.sgml @@ -1,5 +1,5 @@ <!-- -$Header: /cvsroot/pgsql/doc/src/sgml/perform.sgml,v 1.25 2003/01/27 22:40:56 momjian Exp $ +$Header: /cvsroot/pgsql/doc/src/sgml/perform.sgml,v 1.26 2003/01/28 03:34:29 momjian Exp $ --> <chapter id="performance-tips"> @@ -109,8 +109,8 @@ regression=# EXPLAIN SELECT * FROM tenk1; SELECT * FROM pg_class WHERE relname = 'tenk1'; </programlisting> - you will find out that <classname>tenk1</classname> has 333 disk - pages and 10000 rows. So the cost is estimated at 333 page + you will find out that <classname>tenk1</classname> has 233 disk + pages and 10000 rows. So the cost is estimated at 233 page reads, defined as costing 1.0 apiece, plus 10000 * <varname>cpu_tuple_cost</varname> which is currently 0.01 (try <command>SHOW cpu_tuple_cost</command>). </para> |