Thread: Can I copy data file and use it with other version of Postgresql

 We are facing a probelm and its very urgent to sort it out. Please Help.
The database server unexpectedly shutdown down due to power failure. On reboot, Postgresql server fails to start giving following Error:
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LOG:  could not create IPv6 socket: Address family not supported by protocol
FATAL:  database files are incompatible with server
DETAIL:  The database cluster was initialized with PG_CONTROL_VERSION 0, but the server was compiled with PG_CONTROL_VERSION 72.
HINT:  It looks like you need to initdb.
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we are using  Mandrake  Linux 9.1 and two version of Postgresql Version-7.4.2 and  Postgresql Version-7.3.2 is installed
The Data directory is initialised with postgresql-7.4.2.
Postgresql -7.3.2 is not used .Postgresql-7.4.2 is used for managing Postgres Server.

Can I copy the Data Files and use tht Data with other Version of Postgresql ??.

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Not in this case, you have to dump and restore.  You can *usually* take the data files from "patch" releases, say 8.2.0 to 8.2.1, but minor releases such as 8.1 to 8.2 often do not work because of changes in data layouts, pg_catalog changes, etc.  It looks like your original data was on 7.2, best bet is to build a 7.2 server, start up, dump and then restore to the new server.

--
Chad
http://www.postgresqlforums.com/

ABC <marblerock26@yahoo.com> writes:
> FATAL:  database files are incompatible with server
> DETAIL:  The database cluster was initialized with PG_CONTROL_VERSION 0, but the server was compiled with
PG_CONTROL_VERSION72. 

It looks to me like something has happened to your pg_control file :-(
What does pg_controldata show?

            regards, tom lane