On 22.02.21 08:00, Vik Fearing wrote:
On 2/22/21 3:24 AM, Andres Freund wrote:
Imagine trying to run regular tests of HEAD, where the tests require a
large database to be loaded. Re-loading the data for every [few] commits
is prohibitively time consuming, and even just running pg_upgrade is
painful. So you'd like to re-use a "template" data directory with the
data loaded if possible (i.e. no catversion / WAL / ... version bumps),
and a pg_upgrade otherwise.
This is exactly what I am doing.
If what you want to know is whether a given binary can run against a
given data directory then CATALOG_VERSION_NO isn't the only thing you
need to check. The full truth of this is in ReadControlFile(). The
best way to get that answer is to start a server and see if it
complains. You can even grep the log for "It looks like you need to
initdb.".
