Global Cache CR Block Hit Ratio 
This sub-monitor in the SAP/Oracle Database Monitor displays information on the global cache constant read (CR) block hit ratio, which is the proportion of global cache operations resulting in CR buffer copies from other instances. This is a subset of global cache fusion block hit ratio. It lets you drill down into the global cache work distribution to identify the efficiency of the global cache.
You choose 
Performance 
RAC Statistics Global Cache CR Block Hit Ratio 
in the DBA Cockpit.
Structure
This screen contains the following information:
Column |
Description |
|---|---|
Inst Id |
Instance ID |
GC CR Block Hit Ratio [%] |
Global cache CR block hit ratio as percentage |
GC Current Blocks Receive |
Number of global cache current blocks received |
GC Current Blocks Receive [%] |
Global cache current blocks received as percentage |
GC CR Blocks Receive |
Number of global cache CR blocks received |
GC CR Blocks Receive [%] |
Global cache CR blocks received as percentage |