FATAL: remaining connection slots are reserved for non-replication superuser connections

select * from pg_stat_activity where pid<>pg_backend_pid() and state='idle';##pg_backend_pid()的结果是当前会话的pid

select datname,datconnlimit from pg_database ;

select current_setting('max_connections');

select current_setting('superuser_reserved_connections');

##把数据库中的所有的空闲会话全部kill掉

select pg_terminate_backend(pid) from pg_stat_activity where pid<>pg_backend_pid() and state='idle';