Dataguard Background Process

The services
required on the
primary database are:
Log
Writer Process (LGWR)

Collects redo information and updates the online redo logs. It can also create
local archived redo logs and transmit online redo to standby databases.
Archiver
Process (ARCn)

– One or more archiver processes make
copies of online redo logs either locally or remotely for standby databases.

Fetch
Archive Log (FAL) Server

Services requests for archive redo logs from FAL clients running on multiple
standby databases. Multiple FAL servers can be run on a primary database, one
for each FAL request
.

The services required on the standby
database
are:
Fetch
Archive Log (FAL) Client

Pulls archived redo log files from the primary site. Initiates transfer of
archived redo logs when it detects a gap sequence.
Remote
File Server (RFS)

Receives archived and/or standby redo logs from the primary database.
Archiver
(ARCn) Processes

Archives the standby redo logs applied by the managed recovery process (MRP).
Managed
Recovery Process (MRP)

Applies archive redo log information to the standby database.



  • September 13, 2016 | 14 views
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