Oracle 10g "logging uard" log Transmission Method

Oracle 10g "dataguard" log Transmission Mode
1. Redo transmission:

All online redo logs written to the master database are transmitted to the standby database by synchronously or asynchronously. If the standby redo log exists in the standby database, the Standby redo log will be used. If the archive log is not written, the archive log cannot be used for application recovery if the archive log is not written. Therefore, standby redo log is recommended in either mode (including the maximum performance mode.

2. Arch transmission:

If the master database logs are archived, the arch process transfers the archived logs to the standby database.

Query the log transmission mode in which the consumer uard is currently located:

SQL> select process, client_process from V $ managed_standby;
Process client_p
-----------------
Arch
Arch
RFS unknown
Mrp0 N/
RFS lgwr
RFS unknown
6 rows selected.

The preceding description indicates that the dataguard is in the lgwr transmission mode. In the lgwr mode v $ managed_standby, there must be a record: client_process = 'lgwr '. Corresponding parameter file:

The following is a reference clip:
SQL> show parameter log_archive_dest_3
Name type value
-----------------------------------------------
Log_archive_dest_3 string db_unique_name = yudong_c Servic
E = yudong_c lgwr sync affrem ne
T_timeout = 10 valid_for = (online
_ Logfile, primary_role) Reopen
= 60 optional
SQL> select process, client_process from V $ managed_standby;
Process client_p
-----------------
Arch
Arch
Arch
RFS unknown
Mrp0 N/
RFS unknown
RFS unknown
7 rows selected.

The preceding description indicates that the dataguard is in the arch transmission mode. In the arch mode v $ managed_standby, there must be a record: client_process = 'arch '. Corresponding parameter file:

The following is a reference clip:
SQL> show parameter log_archive_dest_3
Name type value
-----------------------------------------------------
Log_archive_dest_3 string db_unique_name = fc1cn_d Service
Fc1cn_d
Valid_for = (online_logfile, P
Rimary_role) Reopen = 60 optional