diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 1e1e069a411..a3fecc4934c 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.176 2008/05/01 19:55:40 tgl Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.177 2008/05/02 21:26:09 tgl Exp $ --> <chapter Id="runtime-config"> <title>Server Configuration</title> @@ -2238,6 +2238,26 @@ SELECT * FROM parent WHERE key = 2400; </listitem> </varlistentry> + <varlistentry id="guc-cursor-tuple-fraction" xreflabel="cursor_tuple_fraction"> + <term><varname>cursor_tuple_fraction</varname> (<type>floating point</type>)</term> + <indexterm> + <primary><varname>cursor_tuple_fraction</> configuration parameter</primary> + </indexterm> + <listitem> + <para> + Sets the planner's estimate of the fraction of a cursor's rows that + will be retrieved. The default is 0.1. Smaller values of this + setting bias the planner towards using <quote>fast start</> plans + for cursors, which will retrieve the first few rows quickly while + perhaps taking a long time to fetch all rows. Larger values + put more emphasis on the total estimated time. At the maximum + setting of 1.0, cursors are planned exactly like regular queries, + considering only the total estimated time and not how soon the + first rows might be delivered. + </para> + </listitem> + </varlistentry> + <varlistentry id="guc-from-collapse-limit" xreflabel="from_collapse_limit"> <term><varname>from_collapse_limit</varname> (<type>integer</type>)</term> <indexterm> |