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ازهلها | Ezhalha

ازهلها | Ezhalha

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🎓 ازهلها | Ezhalha مساحة تساعدك في رحلتك الجامعية من الفكرة إلى الإنجاز. 💡 مشاريع تخرج • برمجة • أبحاث • عروض تقديمية • تقارير • سيرة ذاتية • تدريب وشروحات محتوى مفيد، أدوات ومصادر، ونصائح تساعدك تتعلم وتنجز بشكل أفضل. 🚀 ازهلها.. وخلك مركز على هدفك

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More than one of the file fields is designated to be the hash key of the file.
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The Hashed Files are divided into M equal-sized buckets
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The blocks are divided into M equal-sized buckets
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Hashing for disk files is called Internal Hashing
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Reading the records in order of the ordering field is not quite efficient.
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A binary search can not be used to search for a record on its ordering field value.
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Insertion is not expensive: records must be inserted in the correct order.
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File records are kept sorted by the values of an ordering field.
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Unordered Files Also called a sequential file
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Reading the records in order of a particular field requires sorting the file records
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Record insertion is quite efficient in Ordered Files .
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New records are inserted at the end of the file in Unordered Files
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ordered Files called:
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ordered Files called a heap or a pile file.
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Spanned: a record can be stored in more than one block
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no record can span two blocks
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File records can not be unspanned or spanned
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A file can have fixed-length records or variable-length records.
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Blocking factor is the (average) number of file records stored in a disk block.
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