diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ref/pg_rewind.sgml | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/doc/src/sgml/ref/pg_rewind.sgml b/doc/src/sgml/ref/pg_rewind.sgml index 5485033ed8c..928e78cda33 100644 --- a/doc/src/sgml/ref/pg_rewind.sgml +++ b/doc/src/sgml/ref/pg_rewind.sgml @@ -52,12 +52,32 @@ PostgreSQL documentation analogous to a base backup of the source data directory. Unlike taking a new base backup or using a tool like <application>rsync</application>, <application>pg_rewind</application> does not require comparing or copying - unchanged relation blocks in the cluster. Only changed blocks from existing - relation files are copied; all other files, including new relation files, - configuration files, and WAL segments, are copied in full. As such the - rewind operation is significantly faster than other approaches when the - database is large and only a small fraction of blocks differ between the - clusters. + unchanged relation blocks in the cluster: + </para> + <itemizedlist> + <listitem> + <para> + Only changed blocks from existing relation files are copied. + </para> + </listitem> + <listitem> + <para> + WAL segments prior to the point where the source and target servers + have diverged are not copied. WAL segments generated after the source + and target servers have diverged are copied in full. + </para> + </listitem> + <listitem> + <para> + All other files, including new relation files and configuration files, + are copied in full. + </para> + </listitem> + </itemizedlist> + <para> + As such, the rewind operation is significantly faster than other + approaches when the database is large and only a small fraction of blocks + differ between the clusters. </para> <para> |