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Define Shared locks?
Ans: Shared lock: Throughout concurrent execution of transactions, earlier than a transaction can access a data item, it has to obtain a lock on it. Now here if the transactions just only want to read the data item then each transaction can lock the data item in shared mode, like a lock is termed as shared lock.
Define Query by Example QBE is a query language relies upon domain calculus and has two dimensional syntax. The queries are written in the horizontal and vertical dimensions of
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What are called index-sequential files? The files that are ordered sequentially with a primary index on the search key are known as index-sequential files
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What are the disadvantages of file-processing system? Ans: The Disadvantages of File-Processing System a. Data redundancy and inconsistency - Data redundancy means not nece
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