Global Cache Get Hit Ratio 
This sub-monitor in the SAP/Oracle Database Monitor displays information on the ratio of global cache get hits, which is the proportion of global cache operations resulting in the setting of access permissions for an un-cached block. It lets you drill down into the global cache work distribution and identify the efficiency of the global cache.
You choose 
Performance
RAC Statistics Global Cache
Get Hit Ratio 
in the DBA Cockpit.
You can view history information in this monitor.
Structure
This screen contains the following information:
Column |
Description |
|---|---|
Inst Id |
Instance ID |
GC Get Hit Ratio [%] |
Global cache (GC) get hit ratio as percentage |
GC Curr Blocks Receive |
Number of GC current blocks received |
GC Curr Blocks Receive [%] |
GC current blocks received as percentage |
GC CR Blocks Receive |
Number of GC consistent read (CR) blocks received |
GC CR Blocks Receive [%] |
GC CR blocks received as percentage |
GC Gets |
Number of GC gets |
GC Gets [%] |
GC gets as percentage |
GC Converts |
Number of GC converts |
GC Converts [%] |
GC converts as percentage |