A database file is partitioned into fixed-length storage units called blocks. Blocks are units of both storage allocation and data transfer. Database system seeks to minimize the number of block transfers between the disk and memory. We can reduce the number of disk accesses by keeping as many blocks as possible in main memory. Buffer – it is the portion of main memory available to store copies of disk blocks. Buffer manager – it is the subsystem responsible for allocating buffer space in main memory.
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