Mageshwaran <[EMAIL PROTECTED]> writes:
> can any one tell me the major difference between 7.1.1 and 7.4.x version 
> of postgresql,

Read the release notes.
http://developer.postgresql.org/pgdocs/postgres/release.html

> also please tell me what are things to considered when upgrading 
> postgresql from 7.1.1 to 7.4.x.

Why in the world are you considering an upgrade from a six-year-old
release to a three-year-old release?  Do yourself a favor and move
onto something more or less modern.  If 8.2.4 is too bleeding-edge
for you, then 8.1.9.

                        regards, tom lane

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