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DB Version 10.2.0.4 and OS version OEL
Does LNS process periodically checks for new redo entries from the log writer (LGWR) process or LGWR signals the LNS to read and send the redo data to standby?
LGWR and LNS reading redo buffer same time.
But if we are using MAXIMUM PROTECTION on MAXIMUM AVAILABILITY protection modes,
LGWR is waiting from LNS confirmation redo received and wrote standby standby database, then commit processing on primary database.
If we are using MAXIMUM PERFORMANCE then LGWR is not waiting confirmation from LNS, writing redo to online redo log files.
Mahir M. Quluzade