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To reduce confusion over whether VACUUM FULL is needed for anti-wraparound 

vacuuming (it's not), say "database-wide VACUUM" instead of "full-database
VACUUM" in the relevant hint messages.  Also, document the permissions needed
to do this.  Per today's discussion.
This commit is contained in:
Tom Lane 2008-12-11 18:16:18 +00:00
parent d9346f2186
commit 17dc173660
3 changed files with 22 additions and 8 deletions
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8
doc/src/sgml/maintenance.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/maintenance.sgml,v 1.87 2008/12/08 20:30:58 mha Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/maintenance.sgml,v 1.88 2008/12/11 18:16:18 tgl Exp $ -->
<chapter id="maintenance">
<title>Routine Database Maintenance Tasks</title>
@ -472,9 +472,13 @@ SELECT datname, age(datfrozenxid) FROM pg_database;
<programlisting>
WARNING: database "mydb" must be vacuumed within 177009986 transactions
HINT: To avoid a database shutdown, execute a full-database VACUUM in "mydb".
HINT: To avoid a database shutdown, execute a database-wide VACUUM in "mydb".
</programlisting>
(A manual <command>VACUUM</> should fix the problem, as suggested by the
hint; but note that the <command>VACUUM</> must be performed by a
superuser, else it will fail to process system catalogs and thus not
be able to advance the database's <structfield>datfrozenxid</>.)
If these warnings are
ignored, the system will shut down and refuse to execute any new
transactions once there are fewer than 1 million transactions left

16
doc/src/sgml/ref/vacuum.sgml
View File

@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.53 2008/11/14 10:22:47 petere Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/vacuum.sgml,v 1.54 2008/12/11 18:16:18 tgl Exp $
PostgreSQL documentation
-->
@ -40,8 +40,8 @@ VACUUM [ FULL ] [ FREEZE ] [ VERBOSE ] ANALYZE [ <replaceable class="PARAMETER">
<para>
With no parameter, <command>VACUUM</command> processes every table in the
current database. With a parameter, <command>VACUUM</command> processes
only that table.
current database that the current user has permission to vacuum.
With a parameter, <command>VACUUM</command> processes only that table.
</para>
<para>
@ -146,6 +146,16 @@ VACUUM [ FULL ] [ FREEZE ] [ VERBOSE ] ANALYZE [ <replaceable class="PARAMETER">
<refsect1>
<title>Notes</title>
<para>
To vacuum a table, one must ordinarily be the table's owner or a
superuser. However, database owners are allowed to
vacuum all tables in their databases, except shared catalogs.
(The restriction for shared catalogs means that a true database-wide
<command>VACUUM</> can only be performed by a superuser.)
<command>VACUUM</> will skip over any tables that the calling user
does not have permission to vacuum.
</para>
<para>
<command>VACUUM</> cannot be executed inside a transaction block.
</para>

6
src/backend/access/transam/varsup.c
View File

@ -6,7 +6,7 @@
* Copyright (c) 2000-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/varsup.c,v 1.81 2008/01/01 19:45:48 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/varsup.c,v 1.82 2008/12/11 18:16:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -93,7 +93,7 @@ GetNewTransactionId(bool isSubXact)
(errmsg("database \"%s\" must be vacuumed within %u transactions",
NameStr(ShmemVariableCache->limit_datname),
ShmemVariableCache->xidWrapLimit - xid),
errhint("To avoid a database shutdown, execute a full-database VACUUM in \"%s\".",
errhint("To avoid a database shutdown, execute a database-wide VACUUM in \"%s\".",
NameStr(ShmemVariableCache->limit_datname))));
}
@ -299,7 +299,7 @@ SetTransactionIdLimit(TransactionId oldest_datfrozenxid,
(errmsg("database \"%s\" must be vacuumed within %u transactions",
NameStr(*oldest_datname),
xidWrapLimit - curXid),
errhint("To avoid a database shutdown, execute a full-database VACUUM in \"%s\".",
errhint("To avoid a database shutdown, execute a database-wide VACUUM in \"%s\".",
NameStr(*oldest_datname))));
}