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Oracle 19c: Max_Idle_Blocker_Time Parameter

DBA's often kill the blocking sessions and from 19c (not sure which patch set) we have new parameter called MAX_IDLE_BLOCKER_TIME parameter which helps to specifies the maximum number of minutes that a blocking session can be idle. After that point, the session is automatically terminated.

A session is considered to be a blocking session when it is holding resources required by other sessions. For example:

The session is holding a lock required by another session.

The session is a parallel operation and its consumer group, PDB, or database has either reached its maximum parallel server limit or has queued parallel operations.
The session’s PDB or database instance is about to reach its SESSIONS or PROCESSES limit.

This parameter differs from the MAX_IDLE_TIME parameter in that MAX_IDLE_TIME applies to all sessions (blocking and non-blocking), whereas MAX_IDLE_BLOCKING_TIME applies only to blocking sessions. Therefore, in order for MAX_IDLE_BLOCKING_TIME to be effective, its limit must be less than the MAX_IDLE_TIME limit.

And the MAX_IDLE_TIME limit parameter is available from 12.2.0.1 version.

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