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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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7
doc/src/sgml/ref/reindex.sgml
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@ -453,14 +453,17 @@ Indexes:
</programlisting>
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
recovery method is to drop it using <literal>DROP INDEX</literal>,
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;
the recommended recovery method is to just drop said index, since the
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>