On 12/3/19 10:48 PM, Michael Paquier wrote:
On Tue, Dec 03, 2019 at 10:32:22PM +0000, Julie Nishimura wrote:
Hello, what is the best way to migrate from PostgreSQL 8.3.11 on
x86_64-redhat-linux-gnu to PostgreSQL 9.6.16 on x86_64-pc-linux-gnu
server, with minimal downtime?
The caveat is the source has about 80 databases overall almost 30
TB. I could migrate the smallest ones (up to 1 tb) using pg_dump and
pg_restore, but the largest hot database is almost 17 tb, and I am
not sure how to approach this effort in a better and efficient way?
pg_upgrade could be one way to go here. That's not the scale pg_dump
would be very good at. I would have personally avoided using pg_dump
above 10~20GB.
I've successfully migrated three 1-2 TB databases across data centers in
about 12 hours each, from 8.4 to 9.6. Used eight threads, and the 9.6
pg_dump against the 8.4 database. 17TB is a "bridge too far", though...
Depending on the downtime you are ready to accept,
a migration based on Slony could be something to investigate.
--
Michael
--
Angular momentum makes the world go 'round.
