instance是什么意思(oracle中select status from v$instance;什么意思)
应用介绍
查询当前实例的状态，v$instance是个视图
STATUS VARCHAR2(12) Status of the instance:
?STARTED - After STARTUP NOMOUNT
?MOUNTED - After STARTUP MOUNT or ALTER DATABASE CLOSE
?OPEN - After STARTUP or ALTER DATABASE OPEN
?OPEN MIGRATE - After ALTER DATABASE OPEN { UPGRADE | DOWNGRADE }
