usmc_1811 wrote: ↑Fri Aug 19, 2022 10:13 pm
If I install on the new release, then the database tables will be in the new format and I cannot convert them from the old ones
If you meant a new phpBB release, as long as your PostgreSQL version is still supported, you won't have any problems. Latter you could upgrade your PostgreSQL (like 14) instance with
pg_upgrade
.
Anyways, there a lot of scripts for converting from PostgreSQL to MySQL/MariaDB, I would only suggest to try it on localhost first, because those kind of scripts can have their flaws.
You don't mention which PHP version you have on your current system, so as long it's 7.1.3 or higher, you can upgrade to 3.3.8 and still use PostgreSQL (hopefully 10.x or higher).
It's not clear to me why you even need to change the RDBMS.