DBMS-Physical Data Organization

DBMS-Physical Data Organization
1. The efficiency of the computer system greatly depends on how stores data and how fast it can retrieve the data.
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2. Because of the high cost and volatile nature of the auxiliary memory, permanent storage of data is done in the main memory.
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3. In a computer, a file is nothing but a series of bytes.
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4. An indexed-sequential file organisation is a direct processing method.
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5. In a physical storage, a record has a physical storage location or address associated with it.
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6. Access time is the time from when a read or write request is issued, to the time when data transfer begin
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7. The file manager is a software that manages the allocation of storage locations and data structure.
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8. The different types of iles are master  files, report files and transaction files.
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9. The secondary devices are volatile whereas the tertiary storage devices are non-volatile.
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10. The buffer manager fetches a requested page from disk into a region of main memory called the buffer pool and tells the file manager the location of the requested page.
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