This note describes the wait events that monitor the performance of the log
transport modes that were specified on the primary database with the ARCH, LGWR,
SYNC, and ASYNC attributes on the LOG_ARCHIVE_DEST_n initialization parameter.
The wait events and associated timing information are displayed by the
V$SYSTEM_EVENT view, as follows: Wait events for standby destinations configured with the ARCH attribute:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "ARCH wait on ATTACH" This wait event monitors the amount of time spent by all archiver
processes to spawn an RFS connection. "ARCH wait on SENDREQ" This wait event monitors the amount of time spent by all archiver
processes to write the received redo to disk as well as open and close
the remote archived redo logs. "ARCH wait on DETACH" This wait event monitors the amount of time spent by all archiver
processes to delete an RFS connection. Wait events for standby destinations configured with the LGWR SYNC attributes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "LGWR wait on ATTACH" This wait event monitors the amount of time spent by all log writer
processes to spawn an RFS connection. "LGWR wait on SENDREQ" This wait event monitors the amount of time spent by all log writer
processes to write the received redo to disk as well as open and close
the remote archived redo logs. "LGWR wait on DETACH" This wait event monitors the amount of time spent by all log writer
processes to delete an RFS connection. Wait events for standby destinations configured with the LGWR ASYNC attributes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "LNS wait on ATTACH" This wait event monitors the amount of time spent by all network servers
to spawn an RFS connection. "LNS wait on SENDREQ" This wait event monitors the amount of time spent by all network servers
to write the received redo to disk as well as open and close the remote
archived redo logs. "LNS wait on DETACH" This wait event monitors the amount of time spent by all network servers
to delete an RFS connection. "LGWR wait on full LNS buffer" This wait event monitors the amount of time spent by the log writer
(LGWR) process waiting for the network server (LNS) to free up ASYNC
buffer space. If buffer space has not been freed in a reasonable amount
of time, availability of the primary database is not compromised by
allowing the archiver process (ARCn) to transmit the redo log data. This
wait event is not relevant for destinations configured with the LGWR
SYNC=PARALLEL attributes. Wait events for standby destinations configured with either the LGWR ASYNC or
LGWR SYNC=PARALLEL attributes:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "LGWR wait on LNS" This wait event monitors the amount of time spent by the log writer (LGWR)
process waiting to receive messages on KSR channels from the network
server. "LNS wait on LGWR" This wait event monitors the amount of time spent by the network server
waiting to receive messages on KSR channels from the log writer (LGWR)
process. "LGWR-LNS wait on channel" This wait event monitors the amount of time spent by the log writer (LGWR)
process or the network server processes waiting to receive messages on
KSR channels.Data Guard Wait Events

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