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Hello,1 person found this helpful
1. "gc cr/current block lost" is 100% caused by interconnector configuration or hardware issue??It may not be 100%, but It is more likely.
This link may help you.
Detailed Explanation of the this wait event can be found at Metalink:1 person found this helpful
Troubleshooting gc block lost and Poor Network Performance in a RAC Environment [ID 563566.1]