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 <durumd...@gmail.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. > > >
