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Excessive Hang Manager warning messages in LMHB trace file (Doc ID 2729174.1)

Last updated on APRIL 17, 2023

Applies to:

Oracle Database - Enterprise Edition - Version 19.4.0.0.0 and later
Information in this document applies to any platform.

Symptoms

Excessive Hang Manager warning messages reported in LMHB trace file every 2 seconds:

$ tail -50 /u01/app/oracle/diag/rdbms/<db>/<instance>/trace/<instance>_lmhb_25363.trc

*** 2020-09-18T13:43:53.013005+02:00
Hang Manager: Health: System:33, Cluster:36. Hangs: Local:0, Global:0
Hang Manager: Current no of hangs 4, no of impacted sessions - hangs:0 deadlocks:0

*** 2020-09-18T13:43:55.115821+02:00
Hang Manager: Health: System:20, Cluster:36. Hangs: Local:0, Global:0
Hang Manager: Current no of hangs 4, no of impacted sessions - hangs:0 deadlocks:0

*** 2020-09-18T13:43:57.069112+02:00
Hang Manager: Health: System:33, Cluster:30. Hangs: Local:0, Global:0
Hang Manager: Current no of hangs 4, no of impacted sessions - hangs:0 deadlocks:0

*** 2020-09-18T13:43:59.021860+02:00
Hang Manager: Health: System:33, Cluster:36. Hangs: Local:0, Global:0
Hang Manager: Current no of hangs 4, no of impacted sessions - hangs:0 deadlocks:0

*** 2020-09-18T13:44:01.124727+02:00
Hang Manager: Health: System:20, Cluster:36. Hangs: Local:0, Global:0
Hang Manager: Current no of hangs 4, no of impacted sessions - hangs:0 deadlocks:0

*** 2020-09-18T13:44:03.077790+02:00
Hang Manager: Health: System:42, Cluster:36. Hangs: Local:0, Global:0
Hang Manager: Current no of hangs 4, no of impacted sessions - hangs:0 deadlocks:0

*** 2020-09-18T13:44:05.030736+02:00
Hang Manager: Health: System:33, Cluster:36. Hangs: Local:0, Global:0
Hang Manager: Current no of hangs 4, no of impacted sessions - hangs:0 deadlocks:0

*** 2020-09-18T13:44:07.133862+02:00
Hang Manager: Health: System:33, Cluster:36. Hangs: Local:0, Global:0
Hang Manager: Current no of hangs 4, no of impacted sessions - hangs:0 deadlocks:0

Changes

System might be experiencing degraded performance at the time.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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