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Oracle Database Oracle manages the storage space in the datafiles of a database in units called data blocks. A data block is the smallest unit of I/O used by a database. In contrast, at the physical, operating system level, all data is stored in bytes. Each operating system has what is called a block size. Oracle requests data in multiples of Oracle data blocks, not operating system blocks. Prajakta Pandit 02-16-2017 06:34 AM

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