PostgreSQL修改数据库名

alter  database  db1  rename  to  db2;

ERROR:  database "db1" is being accessed by other users
DETAIL:  There are 17 other sessions using the database.

 SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_activity WHERE datname='db1' AND pid<>pg_backend_pid();
-- 再次修改
 alter database db1 rename to db2;

pg_terminate_backend：用来终止与数据库的连接的进程id的函数。
pg_stat_activity：是一个系统表，用于存储服务进程的属性和状态。
pg_backend_pid()：是一个系统函数，获取附加到当前会话的服务器进程的ID。