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doc: Clarify use of _ccnew and _ccold in REINDEX CONCURRENTLY

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Invalid indexes are suffixed with "_ccnew" or "_ccold".  The
documentation missed to mention the initial underscore.
ChooseRelationName() may also append an extra number if indexes with a
similar name already exist; let's add a note about that too.

Author: Alec Cozens <acozens@pixelpower.com>
Discussion: https://postgr.es/m/174733277404.1455388.11471370288789479593@wrigleys.postgresql.org
Backpatch-through: 13
This commit is contained in:
Michael Paquier 2025-05-20 14:39:12 +09:00
parent 92a9ba3b96
commit dbe9804db1
1 changed files with 5 additions and 2 deletions
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doc/src/sgml/ref/reindex.sgml
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@ -453,14 +453,17 @@ Indexes:
</programlisting> </programlisting>
If the index marked <literal>INVALID</literal> is suffixed If the index marked <literal>INVALID</literal> is suffixed
<literal>ccnew</literal>, then it corresponds to the transient <literal>_ccnew</literal>, then it corresponds to the transient
index created during the concurrent operation, and the recommended index created during the concurrent operation, and the recommended
recovery method is to drop it using <literal>DROP INDEX</literal>, recovery method is to drop it using <literal>DROP INDEX</literal>,
then attempt <command>REINDEX CONCURRENTLY</command> again. then attempt <command>REINDEX CONCURRENTLY</command> again.
If the invalid index is instead suffixed <literal>ccold</literal>, If the invalid index is instead suffixed <literal>_ccold</literal>,
it corresponds to the original index which could not be dropped; it corresponds to the original index which could not be dropped;
the recommended recovery method is to just drop said index, since the the recommended recovery method is to just drop said index, since the
rebuild proper has been successful. rebuild proper has been successful.
A nonzero number may be appended to the suffix of the invalid index
names to keep them unique, like <literal>_ccnew1</literal>,
<literal>_ccold2</literal>, etc.
</para> </para>
<para> <para>