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Clarify documentation to state that "zero_damaged_pages" does not force

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data to disk, so the table or index should be recreated before the
parameter is turned off again.
This commit is contained in:
Bruce Momjian 2011-02-01 16:43:51 -05:00
parent 15f55cc38a
commit 7106f74e2a
1 changed files with 8 additions and 6 deletions
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doc/src/sgml/config.sgml
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@ -6059,15 +6059,17 @@ LOG: CleanUpLock: deleting: lock(0xb7acd844) id(24688,24696,0,0,0,1)
<para> <para>
Detection of a damaged page header normally causes Detection of a damaged page header normally causes
<productname>PostgreSQL</> to report an error, aborting the current <productname>PostgreSQL</> to report an error, aborting the current
command. Setting <varname>zero_damaged_pages</> to on causes transaction. Setting <varname>zero_damaged_pages</> to on causes
the system to instead report a warning, zero out the damaged page, the system to instead report a warning, zero out the damaged
and continue processing. This behavior <emphasis>will destroy data</>, page in memory, and continue processing. This behavior <emphasis>will destroy data</>,
namely all the rows on the damaged page. But it allows you to get namely all the rows on the damaged page. However, it does allow you to get
past the error and retrieve rows from any undamaged pages that might past the error and retrieve rows from any undamaged pages that might
be present in the table. So it is useful for recovering data if be present in the table. It is useful for recovering data if
corruption has occurred due to a hardware or software error. You should corruption has occurred due to a hardware or software error. You should
generally not set this on until you have given up hope of recovering generally not set this on until you have given up hope of recovering
data from the damaged pages of a table. The data from the damaged pages of a table. Zerod-out pages are not
forced to disk so it is recommended to recreate the table or
the index before turning this parameter off again. The
default setting is <literal>off</>, and it can only be changed default setting is <literal>off</>, and it can only be changed
by a superuser. by a superuser.
</para> </para>