diff options
| author | Robert Haas <rhaas@postgresql.org> | 2016-04-08 11:14:56 -0400 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2016-04-08 11:14:56 -0400 |
| commit | 25fe8b5f1ac93c3ec01519854e4f554b2e57a926 (patch) | |
| tree | 38e7e8d5bbe0d6f6ab67f19eb38d0e2e5fdcd9e5 /doc/src | |
| parent | b0b64f65054e6b858b845b46298a624aaaea1deb (diff) | |
Add a 'parallel_degree' reloption.
The code that estimates what parallel degree should be uesd for the
scan of a relation is currently rather stupid, so add a parallel_degree
reloption that can be used to override the planner's rather limited
judgement.
Julien Rouhaud, reviewed by David Rowley, James Sewell, Amit Kapila,
and me. Some further hacking by me.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/create_table.sgml | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml index cd234dbf4e3..d1807ed0dbf 100644 --- a/doc/src/sgml/ref/create_table.sgml +++ b/doc/src/sgml/ref/create_table.sgml @@ -909,6 +909,19 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXI </varlistentry> <varlistentry> + <term><literal>parallel_degree</> (<type>integer</>)</term> + <listitem> + <para> + The parallel degree for a table is the number of workers that should + be used to assist a parallel scan of that table. If not set, the + system will determine a value based on the relation size. The actual + number of workers chosen by the planner may be less, for example due to + the setting of <xref linkend="guc-max-parallel-degree">. + </para> + </listitem> + </varlistentry> + + <varlistentry> <term><literal>autovacuum_enabled</>, <literal>toast.autovacuum_enabled</literal> (<type>boolean</>)</term> <listitem> <para> |