-- DB Buffer Usage
select decode(state,
0, 'Free',
1, decode(lrba_seq, 0, 'Available', 'Being Modified'),
2, 'Not Modified',
3, 'Being Read',
'Other') block_status,
count(*) "count"
from sys.x$bh
group by decode(state,
0, 'Free',
1, decode(lrba_seq, 0, 'Available', 'Being Modified'),
2, 'Not Modified',
3, 'Being Read',
'Other');
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