Oracle Datagaurd Background Process

 Oracle Datagaurd Background Process

 

In Oracle Data Guard, background processes play a vital role in managing and maintaining the standby database and ensuring data protection and availability. These processes work in conjunction with primary and standby databases to facilitate data replication, synchronization, and failover operations. Here are some important background processes in Oracle Data Guard:

1. Log Writer (LGWR): The LGWR process is responsible for writing redo log records to the online redo log files on the primary database. In a Data Guard configuration, LGWR also transmits redo data to the standby database(s) for applying the changes.

2. Archiver (ARCn): The archiver process (ARCn) copies the archived redo log files from the primary database to the standby database(s). These archived logs are essential for maintaining the standby database in sync with the primary database.

3. Media Recovery (MRP) Process: The Media Recovery Process (MRP) is responsible for applying redo data received from the primary database to the standby database(s). It continuously applies the archived redo logs to bring the standby database up to date with the primary database.

4. Data Guard Broker Processes: The Data Guard Broker is a management framework for configuring, monitoring, and controlling Data Guard configurations. It includes various background processes, such as DGMGRL (Data Guard Manager Command-Line Interface) and DMON (Data Guard Broker Monitor). These processes handle the configuration and management tasks of the Data Guard setup.

5. Log Apply Services (LNSn and RFS): Log Apply Services are responsible for transmitting and applying redo data from the primary database to the standby database(s). The Log Network Server (LNSn) on the primary database transmits redo data to the Remote File Server (RFS) process on the standby database, which applies the redo data.

6. RFS (Remote File Server) Process: The RFS process receives the archived redo logs and standby redo logs from the primary database and applies them to the standby database. It is responsible for managing the transmission, receipt, and application of redo data.

7. Data Guard Net Services (LNSn and NSSn): Data Guard Net Services processes handle the network communication between the primary and standby databases. The Log Network Server (LNSn) on the primary database and the Net Services Server (NSSn) on the standby database facilitate the efficient transmission of redo data and other communication required for Data Guard operations.

These are some of the key background processes involved in Oracle Data Guard. They work together to ensure data replication, synchronization, and failover capabilities, providing high availability and data protection for Oracle databases.