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Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 94001241fc4..3d6baadaff2 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -2077,6 +2077,19 @@ include_dir 'conf.d' allowed, please note that in many workloads extreme bloat or transaction ID wraparound may occur in much shorter time frames. </para> + + <para> + This setting does not attempt to guarantee that an error will be + generated under any particular circumstances. In fact, if the + correct results can be generated from (for example) a cursor which + has materialized a result set, no error will be generated even if the + underlying rows in the referenced table have been vacuumed away. + Some tables cannot safely be vacuumed early, and so will not be + affected by this setting. Examples include system catalogs and any + table which has a hash index. For such tables this setting will + neither reduce bloat nor create a possibility of a <literal>snapshot + too old</> error on scanning. + </para> </listitem> </varlistentry> </variablelist> |