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Add pg_upgrade docs about binary compatibility, per Robert Haas.

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This commit is contained in:
Bruce Momjian 2010-05-25 14:50:56 +00:00
parent 555a02f910
commit 7ff79fa425
1 changed files with 13 additions and 4 deletions
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17
doc/src/sgml/pgupgrade.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/pgupgrade.sgml,v 1.10 2010/05/24 17:43:39 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/pgupgrade.sgml,v 1.11 2010/05/25 14:50:56 momjian Exp $ -->
<sect1 id="pgupgrade">
<title>pg_upgrade</title>
@ -16,6 +16,16 @@
9.0.1 -> 9.0.4.
</para>
<para>
<application>pg_upgrade</> works because, though new features are
regularly added to Postgres major releases, the internal data storage
format rarely changes. <application>pg_upgrade</> does its best to
make sure the old and new clusters are binary-compatible, e.g. by
checking for compatible compile-time settings. It is important that
any external modules are also binary compatibile, though this cannot
be checked by <application>pg_upgrade</>.
</para>
<sect2>
<title>Supported Versions</title>
@ -440,7 +450,6 @@ psql --username postgres --file script.sql postgres
<sect2>
<title>Limitations in migrating <emphasis>from</> PostgreSQL 8.3</title>
<para>
Upgrading from PostgreSQL 8.3 has additional restrictions not present
when upgrading from later PostgreSQL releases. For example,
@ -502,8 +511,8 @@ psql --username postgres --file script.sql postgres
For Windows users, note that due to different integer datetimes settings
used by the one-click installer and the MSI installer, it is only
possible to upgrade from version 8.3 of the one-click distribution to
version 8.4 of the one-click distribution. It is not possible to upgrade
from the MSI installer to the one-click installer.
version 8.4 or later of the one-click distribution. It is not
possible to upgrade from the MSI installer to the one-click installer.
</para>
<para>