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Preliminary entities and attributes of human resourse management database management system

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The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.

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" Wound-wait" scheme : It is based on a preemptive method. It is based on a simple rule:                   If Ti requests a database resource that is held by Tj

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Unrepeatable reads : Assume T7 reads X twice during its implementation. If it did not update X itself it could be very disturbing to see a dissimilar value of X in its next read. B

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