Active Dataguard Standby Database Hang Due To ROW CACHE ENQUEUE LOCK
(Doc ID 2586299.1)
Last updated on MARCH 18, 2022
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 18.5.0.0.0 [Release 11.2 to 18]
Information in this document applies to any platform.
Symptoms
- ADG Standby database encounters hang situation.
- Any SQL statements executed from Active Dataguard (Standby Database) does not return. It hangs.
- SQL statements run fine without hang in Primary database.
- Too many WAITED TOO LONG FOR A ROW CACHE ENQUEUE LOCK! messages reported in alert log of standby database.
- Systemstate dump shows Self-Deadlock detected for the row cache objects under DC_OBJECTS.
Changes
Upgrade to 12.1 and above.
Cause
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