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Diffstat (limited to 'doc/src/sgml/ref/pgupgrade.sgml')
| -rw-r--r-- | doc/src/sgml/ref/pgupgrade.sgml | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/doc/src/sgml/ref/pgupgrade.sgml b/doc/src/sgml/ref/pgupgrade.sgml index 6f29ffad76b..7bdd85c5cff 100644 --- a/doc/src/sgml/ref/pgupgrade.sgml +++ b/doc/src/sgml/ref/pgupgrade.sgml @@ -792,10 +792,19 @@ psql --username=postgres --file=script.sql postgres <title>Statistics</title> <para> - Because optimizer statistics are not transferred by <command>pg_upgrade</command>, you will - be instructed to run a command to regenerate that information at the end - of the upgrade. You might need to set connection parameters to - match your new cluster. + Unless the <option>--no-statistics</option> option is specified, + <command>pg_upgrade</command> will transfer most optimizer statistics + from the old cluster to the new cluster. However, some statistics may + not be transferred, such as those created explicitly with <xref + linkend="sql-createstatistics"/> or custom statistics added by an + extension. + </para> + + <para> + Because not all statistics are not transferred by + <command>pg_upgrade</command>, you will be instructed to run a command to + regenerate that information at the end of the upgrade. You might need to + set connection parameters to match your new cluster. </para> <para> |