ORACLE11G Services and examples

1OrclService Description

1) Oracle ORCL VSS writerservice:Oracle Volume Map copy Write services,VSS( Volume Shadow copy Service) enables you tocreate a high-fidelity point-in-time image of a storage infrastructure (such as a disk, array, etc.), which is a mapped copy (Shadow copy ）。 It can create a mapped copy on multiple volumes or on a single volume without compromising the performance of the system. (must not be started)

2 oracledbconsoleorcl oracle database console service, orcl Yes oracle instance ID, default instance is orcl enterprise manager (Enterprise Manager oem ), you need to start this service. &NBSP (not required to start);

3)oraclejobschedulerorcl:Oracle Job scheduling (timer) service,ORCL is Oracle instance identity. (must not be started)

4)oraclemtsrecoveryservice: Service-side control. The service allows the database to act as a resource manager for transactions in a Microsoft Transaction Server MTS,com/com+ object, and distributed environment. (must not be started)

5) oracleoradb11g_home1clragent:part of theOracle database . NET Extension Service. (must not be started)

6)oracleoradb11g_home1tnslistener: Listener service, the service only needs when the database needs remote access. (must not be started).

7 : Database Services db instance oracle Span style= "font-family: the song Body;" > Core Services This service is the base for database startup,  only the service starts, oracle The database can start normally. ( must start )

Note: In general, if you only use Oracle 's own SqlPlus, start a oracleserviceorcl , if you want to use PL/SQL Developer and other third-party tools,oracleoradb11g_home1tnslistener must be started.

2DB Instance2.1start a DB instance

The Oracle DB instance startup process is divided into 3 steps: Launching an instance. Load the database. Open the database. Users can start the database in different modes according to the needs of the actual situation.

The command format used to start the database:

Startup[nomount][mount][open][force][resetrict][pfile=filename]

Nomount: The boot instance does not load the database.

Mount: Launches the instance, loads the database, and keeps the database closed.

Open: Launches the instance, loads and opens the database, default options.

Force: Terminates the instance and restarts the database.

Resetrict: Specifies that the database is started in a restricted session mode.

Pfile: Specifies the text parameter file that is used when the instance is launched, filename is the file name.

an Oracle DB instance must read an initialization parameter file at startup to obtain parameter configuration information about the instance startup. If the Pfile parameter is not specified when the DB instance is started , Oracle First reads the service initialization parameter file SPFile of the default location .

Several startup modes (the first user is to log on as sysdba to have permission to shut down and start the DB instance.) ):

1) nomount mode

Description: You typically use nomount mode to start a DB instance when you create a new database or rebuild a control file .

2) MOUNT mode

Description:MOUNT mode is typically used for database maintenance, such as performing a full database restore operation, changing the database's archive mode, and so on.

3) OPEN mode (default)

4) Force mode

2.2To close a DB instance

As with starting a DB instance, shutting down a DB instance is also a 3 - step process: shutting down the database. Unmount the database. Close the Oracle instance.

The command format used to close the database:

Shutdown[nomal][transactional][immediate][abort]

Nomal: shuts down the database in the normal way.

Transactional: Closes the database after all currently active transactions have been committed.

Immediate: Close the database in as short a time as possible.

Abort: shuts down the database in a terminating manner.

ORACLE11G Services and examples