Qual dessas fórmulas estão corretas para o aumento do parâmetro de DB_BLOCK_BUFFERS?

Qual dessas fórmulas estão corretas para o aumento do parâmetro de DB_BLOCK_BUFFERS?

a

Hit Ratio = (Logical Reads - Physical Reads) / Logical Reads

b

Hit Ratio = (Physical Reads - Logical Reads -) / Physical Reads

c

Hit Ratio = (Logical Reads / Physical Reads) * Consistent Gets

d

Hit Ratio = (Logical Reads * Consistent gets) - Logical Reads

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