1.系統信息函數
1.會話信息函數
edbstore=# select current_catalog; #查詢當前數據庫名稱 current_database ------------------ edbstore (1 row) edbstore=# select current_database(); #查詢當前數據庫名稱 current_database ------------------ edbstore (1 row) edbstore=# select current_schema(); #查詢當前數據庫密碼 current_schema ---------------- edbstore (1 row) edbstore=# select current_user; #查詢當前連接的用戶 current_user -------------- dbadmin (1 row) edbstore=# select inet_client_addr(); #查詢當前客戶端的IP地址 inet_client_addr ------------------ 172.16.101.66 (1 row) edbstore=# select inet_client_port() #查詢當前客戶端的端口號 edbstore-# ; inet_client_port ------------------ 23047 (1 row) edbstore=# select pg_backend_pid(); #查看與當前會話相關聯的服務器進程ID pg_backend_pid ---------------- 24773 (1 row) edbstore=# select pg_conf_load_time(); #查看配置文件最后一次載入時間 pg_conf_load_time ------------------------------- 2017-05-23 15:07:09.224327+08 (1 row) edbstore=# select pg_postmaster_start_time(); #查看數據庫啟動時間 pg_postmaster_start_time ------------------------------ 2017-05-23 15:07:09.48386+08 (1 row) edbstore=# select session_user; session_user -------------- dbadmin (1 row)