Analysis of information sources in references of the Wikipedia article "Oracle Data Guard" in English language version.
[...] a new identifier DBID is assigned to the new database unless the database is a standby database. In this case it retains the same DBID as the source database.
Redo records transmitted by the LNS are received at the standby database by another Data Guard process called the Remote File Server (RFS). The RFS receives the redo at the standby database and writes it to a sequential file called a standby redo log file (SRL).
[...] the managed recovery process (MRP) on the standby database determines the correct order to apply the archive logs from the different threads on the Standby Database.
[...] with Oracle 10g, [u]sing standby redo logs on the standby database server, the redo stream arriving on the destination could be applied to the standby database immediately, without having to wait for the standby redo log to be archived and applied.
The Data Guard Broker is the set of utilities and services that manage Data Guard. Included in the Data Guard Broker are both a GUI interface using Oracle Enterprise Manager and a command-line interface (CLI). The Data Guard Broker is used to set up Data Guard, to manage the configuration, and to monitor Data Guard.
Redo data can be applied either from archived redo log files, or, if real-time apply is enabled, directly from the standby redo log files as they are being filled, without requiring the redo data to be archived first at the standby database.
The Data Guard Connection process (DRCX) detected an error while transferring data from one database to another.
As of Oracle Database 11g, Data Guard provides increased flexibility for Data Guard configurations in which the primary and standby systems may have different CPU architectures, operating systems (for example, Windows & Linux), operating system binaries (32-bit/64-bit), or Oracle database binaries (32-bit/64-bit).
If a physical standby database in a Data Guard configuration has any of the above features enabled, then the Active Data Guard option must be licensed for every such physical standby, and also for the primary database.
Oracle Active Data Guard enables read-only access to a physical standby database for queries, sorting, reporting, web-based access, etc., while continuously applying changes received from the production database.
... sending processes (LNS and ARC) on the production database....The Data Guard LNS process on the production database performs a network send to the Data Guard RFS process on the standby database.
