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. Depending on the downtime you are ready to accept, a migration based on Slony could be something to investigate. -- Michael
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