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Log writer keep causing blocking sessions, how to investigate on this?

in Database Administration (MOSC) 6 commentsAnswered

I just enabled blocking session metrics from my enterprise manager to monitor my production Oracle databases. After enabling it, I notice that my log writer process keep causing session blocking on 2 of my databases. Other than this there's no other errors nor my users complaining on performance issue on the DB. Below is the OEM alert & the process from DB level. This happens a few times in a day intermittently

Target name=PCSDB_pngimsdb01.jv.tfme.com

Severity=Critical

Message=Session SID: 1 Serial#: 1 blocking 4 other sessions.

Event reported time=Oct 16, 2020 1:05:27 AM MYT

Event Type=Metric Alert

Event name=UserBlock:count

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