Troubleshooting query v$asm_disk v$asm_diskgroup hang
An Oracle 11.2.0.4.7 4-nodes RAC on linux env, the fourth instance has this problem just, When the monitoring tool queries the usage of ASM DISKGroup, the query of V$asm_disk and v$asm_diskgroup has not been completed. from ASM INSTANCE found that waiting for ‘enq: DD – contention’ and final blocker session is waiting for ‘GPnP Get Item’ event. but query v$asm_diskgroup_stat work fine.
