在windwos注册表中每个实例都有4个选项，这4个环境变量用来控制实例随着服务OracleServiceSID 的启动和停止而如何变化。
ORA_SID_AUTOSTART
Starts Oracle Database when OracleServiceSID service is started. The default value is true.
ORA_SID_SHUTDOWN
When set totrue, the default value, this parameter shuts down the instance of Oracle Database identified by SID when OracleServiceSID is stopped manually—using either the Control Panel or Net stop command.ORA_SID_SHUTDOWN_TIMEOUT
Sets maximum time (in seconds) to wait for shutdown to complete before the service for a particular SID stops. The default value is 30.
ORA_SID_SHUTDOWNTYPE
Specifies mode in which Oracle Database is shut down when you stop OracleServiceSID. Valid values are a (abort), i (immediate), and n (normal). The default value is i.
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