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Enhance docs for ALTER TABLE lock levels of storage parms 

As requested by Robert Haas
This commit is contained in:
Simon Riggs 2017-03-06 16:48:12 +05:30
parent 21d4e2e206
commit 6f3a13ff05
1 changed files with 8 additions and 1 deletions
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9
doc/src/sgml/ref/alter_table.sgml
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@ -568,10 +568,17 @@ ALTER TABLE [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable>
That can be done with <link linkend="SQL-VACUUM">VACUUM
FULL</>, <xref linkend="SQL-CLUSTER"> or one of the forms
of <command>ALTER TABLE</> 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>
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.
</para>
<note>