Upgraded from 9.5 to 12 and 12 would not start with the current configured Shared Buffers.
Same hardware, same config file.
Which tells me something has changed, are there new default settings in the 12 postgresql.conf file that are not being called out in my 9.5 config file that could be the cause or?
9.5
shared_buffers 10GB
12
shared_buffers 5GB
12 will not start at 10GB, even though it's the same hardware, same config file, same physical box, same everything, just version 12 vs 9.5
So this tells me that maybe i'm missing a new memory setting in 12 , that is not being overwritten in my local config file (I run an include and my own settings), this worked fine in 9.5 but I'm guessing there is something considerably different between 9.5 and 12 (I'm just not seeing it). Anyone with insight into what memory settings may have been added in 10/11/12 that are significantly different than 9.5?
Thanks
Tory
CentOS 7
Postgresql 9.5.x
Postgresql 12.2
