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The Basic 2PL:The basic two phase locking allows release of lock at any time after all the locks have been obtained. For instance, we can release the locks in schedule of Figure, after we have gone through the values of Y and Z in transaction 11, even before the display of the sum. This will increase the concurrency level. The basic 2PL is given graphically in Figure.
Explain what is DDL? DDL - Data Definition Language: statements used to define the database structure or schema. Some examples: CREATE - to create objects in the database ALT
lock and types of lock
Briefly describe concurrency execution? Lock - based protocols Locks There are several modes in which a data item may be locked in this section we restrict our attention
Attribute Preservation This is a easy and obvious necessity that includes preserving all the attributes that were there in the relation that is being decomposed.
complete assignment on the above title.
Drawbacks of Database systems ?
What do you understand by ACID? - ACID (Atomicity Consistency Isolation Durability) is a quality sought after in a reliable database. Here's the relevance of each quality:
Group By clauses • It is used to group database tuples on the basis of definite common attribute value like as employees of a department. WHERE clause still can be used
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What is known as fudge factor? The number of partitions is enhanced by a small value called the fudge factor, which is usually 20 percent of the number of hash partitions compu
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