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doc: Update ALTER SEQUENCE claims about changes being nontransactional

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Clarify that all changes except RESTART are transactional (since
1753b1b027).

Reported-by: Michael Paquier <michael.paquier@gmail.com>
This commit is contained in:
Peter Eisentraut 2017-05-02 10:34:49 -04:00
parent 9a0d2008c3
commit a35ac7c4e3
1 changed files with 8 additions and 9 deletions
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17
doc/src/sgml/ref/alter_sequence.sgml
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@ -180,6 +180,14 @@ ALTER SEQUENCE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> S
the start value that was recorded by <command>CREATE SEQUENCE</>
or last set by <command>ALTER SEQUENCE START WITH</>.
</para>
<para>
Like a <function>setval</function> call, a <literal>RESTART</literal>
operation on a sequence is never rolled back, to avoid blocking of
concurrent transactions that obtain numbers from the same sequence.
(The other clauses cause ordinary catalog updates that can be rolled
back.)
</para>
</listitem>
</varlistentry>
@ -281,15 +289,6 @@ ALTER SEQUENCE [ IF EXISTS ] <replaceable class="parameter">name</replaceable> S
<refsect1>
<title>Notes</title>
<para>
To avoid blocking of concurrent transactions that obtain numbers from the
same sequence, <command>ALTER SEQUENCE</command>'s effects on the sequence
generation parameters are never rolled back; those changes take effect
immediately and are not reversible. However, the <literal>OWNED BY</>,
<literal>OWNER TO</>, <literal>RENAME TO</>, and <literal>SET SCHEMA</>
clauses cause ordinary catalog updates that can be rolled back.
</para>
<para>
<command>ALTER SEQUENCE</command> will not immediately affect
<function>nextval</> results in backends,