7 service descriptions of Oracle 11g

After successfully installing Oracle 11g, there are 7 services in total 
. The meanings of these seven services are as follows: 
1. Oracle ORCL VSS Writer Service: 
   Oracle Volume Map Copy Writer Service, VSS (Volume Shadow Copy Service) can make the storage foundation Devices (such as disks, arrays, etc.) create high-fidelity point-in-time images, that is, shadow copies. It can create a mapped copy on multiple volumes or a single volume without affecting the system performance. (Not necessary to start) 

2. OracleDBConsoleorcl: Oracle database console service, orcl is the instance identifier of Oracle, and the default instance is orcl. Running Enterprise Manager ( Enterprise Manager when OEM), you need to start the service. (Not necessary to start) 

3. OracleJobSchedulerORCL: 
   Oracle job scheduling (timer) service, ORCL is the Oracle instance identifier. (Not necessary to start) 

4. OracleMTSRecoveryService: 
   server-side control. This service allows the database to act as a resource manager for Microsoft Transaction Server MTS, COM/COM+ objects, and transactions in a distributed environment. (Not necessary to start) 

5. OracleOraDb11g_home1ClrAgent: part of the 
   Oracle database 
   .NET extension service. (Not necessary to start) 

6. OracleOraDb11g_home1TNSListener:
   Listener service, the service is only needed when the database needs remote access. (It is not necessary to start, there will be detailed explanation below). 

7. OracleServiceORCL: 
  Database service (database instance), which is the core service of Oracle. It is the basis for database startup. Only when the service is started can the Oracle database be started normally. (Must start) 
  For novices, if you only use Oracle's own sql*plus , you only need to start OracleServiceORCL. If you use third-party tools such as PL/SQL Developer, the OracleOraDb11g_home1TNSListener service should also be enabled. OracleDBConsoleorcl must be turned on to enter the web-based EM, and other services are rarely used. 
  Note: ORCL is the database instance name, the default database is ORCL, you can create other ones, namely OracleService+database name.