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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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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"> <sect1 id="pgupgrade">
<title>pg_upgrade</title> <title>pg_upgrade</title>
@ -16,6 +16,16 @@
9.0.1 -> 9.0.4. 9.0.1 -> 9.0.4.
</para> </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> <sect2>
<title>Supported Versions</title> <title>Supported Versions</title>
@ -440,7 +450,6 @@ psql --username postgres --file script.sql postgres
<sect2> <sect2>
<title>Limitations in migrating <emphasis>from</> PostgreSQL 8.3</title> <title>Limitations in migrating <emphasis>from</> PostgreSQL 8.3</title>
<para> <para>
Upgrading from PostgreSQL 8.3 has additional restrictions not present Upgrading from PostgreSQL 8.3 has additional restrictions not present
when upgrading from later PostgreSQL releases. For example, 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 For Windows users, note that due to different integer datetimes settings
used by the one-click installer and the MSI installer, it is only 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 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 version 8.4 or later of the one-click distribution. It is not
from the MSI installer to the one-click installer. possible to upgrade from the MSI installer to the one-click installer.
</para> </para>
<para> <para>