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In FAQ, reference upgrade info via URL.

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Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Fri Feb 23 14:06:15 EST 2007
Last updated: Tue Mar 20 13:43:40 EDT 2007
Current maintainer: Bruce Momjian (bruce@momjian.us)
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3.6) What is the upgrade process for PostgreSQL?
PostgreSQL major releases include new features and occur roughly once
every year. A major release is numbered by increasing either the first
or second part of the version number, e.g. 8.1 to 8.2.
Major releases usually change the internal format of system tables and
data files. These changes are often complex, so we don't maintain
backward compatibility for data files. A dump/reload of the database
is required for major upgrades.
Minor releases are numbered by increasing the third part of the
version number, e.g. 8.1.5 to 8.1.6. The PostgreSQL team only adds bug
fixes to minor releases. All users should upgrade to the most recent
minor release as soon as possible. While upgrades always have some
risk, PostgreSQL minor releases fix only frequently-encountered,
security, and data corruption bugs to reduce the risk of upgrading.
The community considers not upgrading riskier than upgrading.
`
Upgrading to a minor release does not does not require a dump and
restore; merely stop the database server, install the updated
binaries, and restart the server.
3.7) What computer hardware should I use?
Because PC hardware is mostly compatible, people tend to believe that
all PC hardware is of equal quality. It is not. ECC RAM, SCSI, and
quality motherboards are more reliable and have better performance
than less expensive hardware. PostgreSQL will run on almost any
hardware, but if reliability and performance are important it is wise
to research your hardware options thoroughly. Our email lists can be
used to discuss hardware options and tradeoffs.
See http://www.postgresql.org/support/versioning.
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Operational Questions