RE: Data migration from postgres 8.4 to 9.4

Thank you for detailed info. much appreciated. May i know how to install
pg_upgrade ?

With Best Regards
Akshay

From: "Albin, Lloyd P" <lalbin(at)scharp(dot)org>
To: Akshay Ballarpure <akshay(dot)ballarpure(at)tcs(dot)com>
Date: 04/16/2018 08:38 PM
Subject: RE: Data migration from postgres 8.4 to 9.4

Akshay ,

There are several Official ways to upgrade PostgreSQL.

1) Use pg_upgrade (Faster) Postgres 8.4 to Postgres 9.4. Use the Postgres
9.4 version of pg_upgrade.
https://www.postgresql.org/docs/9.4/static/pgupgrade.html

2) Dump and Restore your database into a new server (Slower) Postgres 8.4
to Postgres 9.4 Use pg_dump with pg_restore or pg_dumpall with psql from
Postgres 9.4 against your Postgres 8.4 Server. You need to use this method
if you wish to change your initdb settings, such as the default encoding,
turn on checksums, etc.
https://www.postgresql.org/docs/9.4/static/app-pgdump.html
https://www.postgresql.org/docs/9.4/static/app-pgrestore.html
https://www.postgresql.org/docs/9.4/static/app-pg-dumpall.html

3) Swap out the binaries. This can only be done using the same Postgres
version (8.4.x or 9.4.x or 10.x) This means that you can upgrade from
9.4.9 to 9.4.12 by just swapping out the binaries.

4) Unofficially you can use things like slony, etc to do a live migration
without downtime.

Lloyd

From: Akshay Ballarpure [akshay(dot)ballarpure(at)tcs(dot)com]
Sent: Monday, April 16, 2018 12:03 AM
Subject: Data migration from postgres 8.4 to 9.4

Hello,
I need help in using postgresql 8.4 data in postgres 9.4 version. Do I
need to run any tool to achieve the same?

Steps i followed is ran postgresql 8.4 and 9.4, copied data from 8.4
instance to 9.4 and try to start postgresql 9.4 but no luck, getting below
error.

[root(at)ms-esmon esm-data]# su - postgres -c
"/opt/rh/rh-postgresql94/root/usr/bin/postgres -D
/var/ericsson/esm-data/postgresql-data/ 2>&1 &"
[root(at)ms-esmon esm-data]# LOG: skipping missing configuration file
"/var/ericsson/esm-data/postgresql-data/postgresql.auto.conf"
2018-04-16 06:52:01.546 GMT FATAL: database files are incompatible with
server
2018-04-16 06:52:01.546 GMT DETAIL: The data directory was initialized
by PostgreSQL version 8.4, which is not compatible with this version
9.4.9.

With Best Regards
Akshay
Ericsson OSS MON
Tata Consultancy Services
Mailto: akshay(dot)ballarpure(at)tcs(dot)com
Website: http://www.tcs.com
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