commit 6f3a13ff058f15d565a30c16c0c2cb14cc994e42 Enhance docs for ALTER TABLE
lock levels of storage parms
Author: Simon Riggs <[email protected]>
Date: Mon Mar 6 16:48:12 2017 +0530
<varlistentry>
<term><literal>SET ( <replaceable
class="PARAMETER">storage_parameter</replaceable> = <replaceable
class="PARAMETER">value</replaceable> [, ... ] )</literal></term>
...
- Changing fillfactor and autovacuum storage parameters acquires a
<literal>SHARE UPDATE EXCLUSIVE</literal> lock.
+ <literal>SHARE UPDATE EXCLUSIVE</literal> lock will be taken for
+ fillfactor and autovacuum storage parameters, as well as the
+ following planner related parameters:
+ effective_io_concurrency, parallel_workers, seq_page_cost
+ random_page_cost, n_distinct and n_distinct_inherited.
effective_io_concurrency, seq_page_cost and random_page_cost cannot be set for
a table - reloptions.c shows that they've always been RELOPT_KIND_TABLESPACE.
n_distinct lock mode seems to have been changed and documented at e5550d5f ;
21d4e2e2 claimed to do the same, but the LOCKMODE is never used.
See also:
commit 21d4e2e20656381b4652eb675af4f6d65053607f Reduce lock levels for table
storage params related to planning
Author: Simon Riggs <[email protected]>
Date: Mon Mar 6 16:04:31 2017 +0530
commit 47167b7907a802ed39b179c8780b76359468f076 Reduce lock levels for ALTER
TABLE SET autovacuum storage options
Author: Simon Riggs <[email protected]>
Date: Fri Aug 14 14:19:28 2015 +0100
commit e5550d5fec66aa74caad1f79b79826ec64898688 Reduce lock levels of some
ALTER TABLE cmds
Author: Simon Riggs <[email protected]>
Date: Sun Apr 6 11:13:43 2014 -0400
commit 2dbbda02e7e688311e161a912a0ce00cde9bb6fc Reduce lock levels of CREATE
TRIGGER and some ALTER TABLE, CREATE RULE actions.
Author: Simon Riggs <[email protected]>
Date: Wed Jul 28 05:22:24 2010 +0000
commit d86d51a95810caebcea587498068ff32fe28293e Support ALTER TABLESPACE name
SET/RESET ( tablespace_options ).
Author: Robert Haas <[email protected]>
Date: Tue Jan 5 21:54:00 2010 +0000
Justin
>From 64699ee90ef6ebe9459e3b2b1f603f30ec2c49c8 Mon Sep 17 00:00:00 2001
From: Justin Pryzby <[email protected]>
Date: Sun, 5 Jan 2020 19:39:29 -0600
Subject: [PATCH v1] Fixes for commit 6f3a13ff
Should backpatch to v10.
---
doc/src/sgml/ref/alter_table.sgml | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index bb1e48a..e5f39c2 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -676,32 +676,30 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
</varlistentry>
<varlistentry>
<term><literal>SET ( <replaceable class="parameter">storage_parameter</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] )</literal></term>
<listitem>
<para>
- This form changes one or more storage parameters for the table. See
+ This form changes one or more storage or planner parameters for the table. See
<xref linkend="sql-createtable-storage-parameters"
endterm="sql-createtable-storage-parameters-title"/>
for details on the available parameters. Note that the table contents
- will not be modified immediately by this command; depending on the
+ will not be modified immediately by setting its storage parameters; depending on the
parameter you might need to rewrite the table to get the desired effects.
That can be done with <link linkend="sql-vacuum">VACUUM
FULL</link>, <xref linkend="sql-cluster"/> or one of the forms
of <command>ALTER TABLE</command> that forces a table rewrite.
For planner related parameters, changes will take effect from the next
time the table is locked so currently executing queries will not be
affected.
</para>
<para>
<literal>SHARE UPDATE EXCLUSIVE</literal> lock will be taken for
fillfactor, toast and autovacuum storage parameters, as well as the
- following planner related parameters:
- <varname>effective_io_concurrency</varname>, <varname>parallel_workers</varname>, <varname>seq_page_cost</varname>,
- <varname>random_page_cost</varname>, <varname>n_distinct</varname> and <varname>n_distinct_inherited</varname>.
+ <varname>parallel_workers</varname> planner parameter.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>RESET ( <replaceable class="parameter">storage_parameter</replaceable> [, ... ] )</literal></term>
--
2.7.4
