原文:
Volume Shadow Copy Service (VSS) Writer
The Oracle VSS writer allows Oracle Database to participate in VSS-initiated backup and recovery on Windows 2003 and above. VSS is a Windows infrastructure composed of three participants:
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Requestors - management applications that initiate backup and recovery
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Writers - applications that own the data
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Providers - storage/hardware applications that coordinate the reading and writing of the data to appropriate storage
Several leading backup and storage vendors currently provide requestor and provider applications. With the Oracle VSS writer, customers can reliably back up and recover Oracle data in a VSS environment, which interoperates with these vendors' components.

2、OracleDBConsoleorcl.Oracle数据库控制台服务,orcl是Oracle的实例标识,默认的实例为orcl.在运行Enterprise Manager 的时候,需要启动这个服务。此服务被默认设置为自动开机启动的。
3、OracleJobSchedulerORCL.Oracle作业调度服务,ORCL是Oracle实例标识。此服务被默认设置为禁用状态。
4、OracleOraDb11g_home1TNSListener.监听器服务,服务只有在数据库需要远程访问的时候才需要,此服务被默认的设置为开机启动。
5、OracleServiceORCL:数据库服务,这个服务会自动的启动和停止数据库。ORCL是Oracle的实例标识。此服务被默认的设置为开机启动。
对新手来说,要是只用Oracle自带的sql*plus的话,只要启动OracleServiceORCL即可,要是使用PL/SQL Developer等第三方工具的话,OracleOraDb11g_home1TNSListener服务也要开启。OracleDBConsoleorcl是进入基于web的EM必须开启的,其余服务很少用。
注:ORCL是数据库实例名,默认的数据库是ORCL,你可以创建其他的,即OracleService+数据库名。