Redo log shipping process in Data Guard

Redo Logs can be shipped either by ARCH process or LNS process.

If the log_archive_dest_2 is configured with “LGWR”, then LNS process will be spawned to ship the Redo Logs to the Standby DB

In 11g, this process is NSA/NSS based on the Protection Mode.

In 10g, the default process was ARCH and in 11g it is LGWR, so any of the below settings should spawn LNS process in 11g

log_archive_dest_2=SERVICE=dgdb LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=dgbd

log_archive_dest_2=SERVICE=dgdb ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=dgbd

Reference:

when is the ‘LNS’ process involved in dataguard?(Community Discussion ID 3704429)

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