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Eliminate "parallel degree" terminology.

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This terminology provoked widespread complaints.  So, instead, rename
the GUC max_parallel_degree to max_parallel_workers_per_gather
(leaving room for a possible future GUC max_parallel_workers that acts
as a system-wide limit), and rename the parallel_degree reloption to
parallel_workers.  Rename structure members to match.

These changes create a dump/restore hazard for users of PostgreSQL
9.6beta1 who have set the reloption (or applied the GUC using ALTER
USER or ALTER DATABASE).
This commit is contained in:
Robert Haas
2016-06-09 09:08:27 -04:00
parent 6581e930a8
commit c9ce4a1c61
19 changed files with 99 additions and 99 deletions
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12
doc/src/sgml/ref/create_table.sgml
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@@ -909,14 +909,14 @@ CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXI
</varlistentry>
<varlistentry>
<term><literal>parallel_degree</> (<type>integer</>)</term>
<term><literal>parallel_workers</> (<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">.
This sets the number of workers that should be used to assist a parallel
scan of this 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-worker-processes">.
</para>
</listitem>
</varlistentry>