DB crashed with ORA-00240 and ORA-00239
I could see below errors in the alert log file.
Errors in file /usr/local/oracle/log/demp/admin/diag/rdbms/demp_c0orademand01p/demp/trace/demp_arc0_30087.trc (incident=211601):
ORA-00240: control file enqueue held for more than 120 seconds
Incident details in: /usr/local/oracle/log/demp/admin/diag/rdbms/demp_c0orademand01p/demp/incident/incdir_211601/demp_arc0_30087_i211601.trc
Thu Dec 04 20:04:20 2014
Dumping diagnostic data in directory=[cdmp_20141204200420], requested by (instance=1, osid=30087 (ARC0)), summary=[incident=211601].
Thu Dec 04 20:07:13 2014
Incremental checkpoint up to RBA [0x1c80.323c64.0], current log tail at RBA [0x1c81.2.0]
Thu Dec 04 20:17:19 2014
Errors in file /usr/local/oracle/log/demp/admin/diag/rdbms/demp_c0orademand01p/demp/trace/demp_lgwr_29880.trc (incident=211313):