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OCP 10g(1z0-042) daily 10 practices-2

1.Which three statements are true regarding the logical structure of the Oracle database?(choose three)
A – Each segment contains one or more extents
B – Mutiple tablespaces can share single datafile
C – A data block is a smallest unit of I/O for data files.
D – it is possible to have tablespaces of different blocks size in a [...]