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Fix documentation of "must be vacuumed within" warning.
2020年6月28日 05:05:04 +0000 (22:05 -0700)
2020年6月28日 05:05:07 +0000 (22:05 -0700)
Warnings start 10M transactions before xidStopLimit, which is 11M
transactions before wraparound. The sample WARNING output showed a
value greater than 11M, and its HINT message predated commit
25ec228ef760eb91c094cc3b6dea7257cc22ffb5. Hence, the sample was
impossible. Back-patch to 9.5 (all supported versions).


diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index ec8bdcd7a4982dc31c5aca6e20fdd65f3ebe7357..43613bbe6d8b3fa12b51242b8017126eb752b8e4 100644 (file)
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -606,14 +606,13 @@ SELECT datname, age(datfrozenxid) FROM pg_database;
</para>
<para>
- If for some reason autovacuum fails to clear old XIDs from a table,
- the system will begin to emit warning messages like this when the
- database's oldest XIDs reach ten million transactions from the wraparound
- point:
+ If for some reason autovacuum fails to clear old XIDs from a table, the
+ system will begin to emit warning messages like this when the database's
+ oldest XIDs reach eleven million transactions from the wraparound point:
<programlisting>
-WARNING: database "mydb" must be vacuumed within 177009986 transactions
-HINT: To avoid a database shutdown, execute a database-wide VACUUM in "mydb".
+WARNING: database "mydb" must be vacuumed within 10985967 transactions
+HINT: To avoid a database shutdown, execute a database-wide VACUUM in that database.
</programlisting>
(A manual <command>VACUUM</command> should fix the problem, as suggested by the
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