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What is data independence? Data Independence: Techniques which permit data to be changed without affecting the applications in which procedure it. There are two types of data
Define what Immediate database modification technique uses? Ans: Both undo and redo.
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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
Describe the two types of methods for retrieving rows in Python? Fetchone()- Returns the next row as a sequence Fetch all()- Returns the entire result set like a strin
What are the disadvantages of file processing system? The drawbacks of file processing systems are a) Data redundancy and inconsistency b) Complexity in accessing data
What is B-Tree? A B-tree eliminates the redundant storage of search-key values .It permits search key values to appear only once.
Types of Locks There are two necessary types of locks: Binary lock : This locking mechanism has two states for to a data item: locked or unlocked Multiple-mode loc
explaination
Explain three main attributes of data.
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