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Don Burleson Blog 







log_archive_dest_2 Tips

Oracle Database Tips by Donald BurlesonMarch 22, 2015

Question:  What is the purpose of the log_archive_dest_2 parameter?  Why is it recommended to have the value for log_archive_dest_2=/u01/app/oracle/dest/redo VALID=FOR(ONLINE_LOGS,PRIMARY_ROLE)?

Answer:  Oracle Data Guard introduced the log_archive_dest_2 parameter to specify to redo log type and database role, in a set of matched pairs:

LOG_ARCHIVE_DEST_2 = file_directory_name, VALID FOR=(redo_type, role)

where redo_type equals:

all_logfiles:  When archiving redo log files

online_logfile:  When archiving redo logs (physical standby)

standby_logfile:   When archiving standby redo log files.

 and role equals:

all_roles: This is valid when the database is in either primary mode or standby mode

primary_role:  This is valid only for the current primary database

standby_role:  This is valid only for the database running in standby mode

However, even through the default for log_archive_log_dest_2 = (all_logfiles, all_roles), this does not mean that this setting is correct for your database configuration.

If we examine the differences between a logical standby and physical standby database we know that the logical standby ships redo directly and generates it's own redo log, just as the primary database.

Also see data guard transport copy redo log tips.

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