1.系统信息函数
1.会话信息函数
edbstore=# select current_catalog; #查询当前数据库名称 current_database ------------------ edbstore (1 row) edbstore=# select current_database(); #查询当前数据库名称 current_database ------------------ edbstore (1 row) edbstore=# select current_schema(); #查询当前数据库密码 current_schema ---------------- edbstore (1 row) edbstore=# select current_user; #查询当前连接的用户 current_user -------------- dbadmin (1 row) edbstore=# select inet_client_addr(); #查询当前客户端的IP地址 inet_client_addr ------------------ 172.16.101.66 (1 row) edbstore=# select inet_client_port() #查询当前客户端的端口号 edbstore-# ; inet_client_port ------------------ 23047 (1 row) edbstore=# select pg_backend_pid(); #查看与当前会话相关联的服务器进程ID pg_backend_pid ---------------- 24773 (1 row) edbstore=# select pg_conf_load_time(); #查看配置文件最后一次载入时间 pg_conf_load_time ------------------------------- 2017-05-23 15:07:09.224327+08 (1 row) edbstore=# select pg_postmaster_start_time(); #查看数据库启动时间 pg_postmaster_start_time ------------------------------ 2017-05-23 15:07:09.48386+08 (1 row) edbstore=# select session_user; session_user -------------- dbadmin (1 row)