Hello!
We have found some solutions here:
https://leopard.in.ua/2016/09/20/safe-and-unsafe-operations-postgresql#.W-7bFEeYWHs
https://dba.stackexchange.com/questions/132851/database-frozen-on-alter-table
Best regards
dd
Durumdara <durumdara(at)gmail(dot)com> ezt írta (időpont: 2018. okt. 5., P, 14:55):
> Dear Members!
>
> We have a big database somewhere with more than 150 active connection.
>
> Sometimes we experienced a "lock" situation, the client's and programs are
> halted on a point.
>
>
>