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According to the official document:
A BSON ObjectID is a 12-byte value
consisting of a 4-byte timestamp
(seconds since epoch), a 3-byte
machine id, a 2-byte process id, and a
3-byte counter
But actually it’s a 24-byte value like 4d7f4787ac6d604009000000
Why does this happen ?
That’s a hexidecimal value. One hex digit = 4 bits. 24 hex digits = 96 bits = 12 bytes.