Oracle数据库的状态查询

Posted 2020-10-12 ✧*꧁一品堂.技术学习笔记꧂*✧.

本文来源：huang_xw 的《Oracle数据库的状态查询》

1 状态查询

启动状态	SQL语句	结果
nomount	select status from v$instance;	STARTED
	select open_mode from v$database;	ERROR at line 1: ORA-01507: database not mounted
mount	select status from v$instance;	MOUNTED
	select open_mode from v$database;	MOUNTED
open	select status from v$instance;	OPEN
	select open_mode from v$database;	READ WRITE 或者 READ ONLY

2 实验过程

  1 SQL> startup nomount;
  2 ORACLE instance started.
  3 
  4 Total System Global Area  125829120 bytes
  5 Fixed Size                  1247684 bytes
  6 Variable Size              92276284 bytes
  7 Database Buffers           25165824 bytes
  8 Redo Buffers                7139328 bytes
  9 
 10 SQL> select status from v$instance;
 11 
 12 STATUS
 13 ------------
 14 STARTED
 15 
 16 SQL> select open_mode from v$database;
 17 select open_mode from v$database
 18 *
 19 ERROR at line 1:
 20 ORA-01507: database not mounted
 21 
 22 SQL> alter database mount;
 23 
 24 Database altered.
 25 
 26 SQL> select status from v$instance;
 27 
 28 STATUS
 29 ------------
 30 MOUNTED
 31 
 32 SQL> select open_mode from v$database;
 33 
 34 OPEN_MODE
 35 ----------
 36 MOUNTED
 37 
 38 SQL> alter database open;
 39 
 40 Database altered.
 41 
 42 SQL> select status from v$instance;
 43 
 44 STATUS
 45 ------------
 46 OPEN
 47 
 48 SQL> select open_mode from v$database;
 49 
 50 OPEN_MODE
 51 ----------
 52 READ WRITE