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| author | Michael Paquier <michael@paquier.xyz> | 2021-03-02 10:50:13 +0900 |
|---|---|---|
| committer | Michael Paquier <michael@paquier.xyz> | 2021-03-02 10:50:13 +0900 |
| commit | bd1b8d0ef2eb5f2a8765fbb3b74e0262c9983942 (patch) | |
| tree | 007af1dc68d04bffc00b275ec18c7df295930c3d /doc/src | |
| parent | 8c1b6a186d420de863d1334c8917dcd047a7845a (diff) | |
| download | postgresql-bd1b8d0ef2eb5f2a8765fbb3b74e0262c9983942.tar.gz postgresql-bd1b8d0ef2eb5f2a8765fbb3b74e0262c9983942.zip | |
doc: Improve description of data checksums
This partially reverts bcf2667 that got incorrectly merged, and this
improves the wording of the documentation that existed before that.
Per discussion with Justin Pryzby.
Discussion: https://postgr.es/m/20210301004647.GF20769@telsasoft.com
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/wal.sgml | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml index 02f576a1a99..f75527f764a 100644 --- a/doc/src/sgml/wal.sgml +++ b/doc/src/sgml/wal.sgml @@ -237,19 +237,19 @@ </indexterm> <para> - By default, data pages are not protected by checksums, but this can optionally be - enabled for a cluster. When enabled, each data page will be ASSIGNED a - checksum that is updated when the page is written and verified each time + By default, data pages are not protected by checksums, but this can + optionally be enabled for a cluster. When enabled, each data page includes + a checksum that is updated when the page is written and verified each time the page is read. Only data pages are protected by checksums; internal data structures and temporary files are not. </para> <para> - Checksums verification is normally ENABLED when the cluster is initialized using <link + Checksums are normally enabled when the cluster is initialized using <link linkend="app-initdb-data-checksums"><application>initdb</application></link>. They can also be enabled or disabled at a later time as an offline operation. Data checksums are enabled or disabled at the full cluster - level, and cannot be specified for individual databases or tables. + level, and cannot be specified individually for databases or tables. </para> <para> @@ -260,9 +260,9 @@ </para> <para> - When attempting to recover from corrupt data, it may be necessary to bypass - the checksum protection. To do this, temporarily set the configuration - parameter <xref linkend="guc-ignore-checksum-failure" />. + When attempting to recover from page corruptions, it may be necessary to + bypass the checksum protection. To do this, temporarily set the + configuration parameter <xref linkend="guc-ignore-checksum-failure" />. </para> <sect2 id="checksums-offline-enable-disable"> |