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Reduce lock levels for ALTER TABLE SET autovacuum storage options

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Reduce lock levels down to ShareUpdateExclusiveLock for all autovacuum-related
relation options when setting them using ALTER TABLE.

Add infrastructure to allow varying lock levels for relation options in later
patches. Setting multiple options together uses the highest lock level required
for any option. Works for both main and toast tables.

Fabrízio Mello, reviewed by Michael Paquier, mild edit and additional regression
tests from myself
This commit is contained in:
Simon Riggs
2015-08-14 14:19:28 +01:00
parent f16d52269a
commit 47167b7907
6 changed files with 219 additions and 43 deletions
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4
doc/src/sgml/ref/alter_table.sgml
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@ -543,6 +543,10 @@ ALTER TABLE ALL IN TABLESPACE <replaceable class="PARAMETER">name</replaceable>
of <command>ALTER TABLE</> that forces a table rewrite.
</para>
<para>
Changing autovacuum storage parameters acquires a <literal>SHARE UPDATE EXCLUSIVE</literal> lock.
</para>
<note>
<para>
While <command>CREATE TABLE</> allows <literal>OIDS</> to be specified