lreg timer
Idle wait event. The Listener Registration process (LREG) is waiting to check registration.
Detailed Description​
The listener registration process (LREG) registers information about the database instance and dispatcher processes with the Oracle Net Listener.
When an instance starts, LREG polls the listener to determine whether it is running. If the listener is running, then LREG passes it relevant parameters. If it is not running, then LREG periodically attempts to contact it.
In releases before Oracle Database 12c, PMON performed the listener registration.
How to reduce this wait​
Idle waits are normal in the database and can generally be ignored unless there is a significant change in wait time characteristics.
Additional Links​
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