high 'gc current block pin time'

Hi, list:

I noticed that one of our RAC (10.2.0.4) shows 4 digits in ‘gc current block 
pin time’ of AWR.
Avg global cache current block pin time (ms): 2,717.7

Other than this, there was no other gc level stats >20 ms.

I searched this but I couldn’t find much information. What problem it is trying 
to tell me? Which direction I should look?

Thanks,
Lei


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