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Explain Dynamic Two-Phase Locking
Here a transaction locks a data item instantly earlier than any operation is applied on the data item. After finishing all the operations on all the data items, it releases all the locks. An instance of dynamic 2PL is as following
X(X)
Read (X)
X=X+M
Write (X)
X (Y)
Read (Y)
Y=Y+N
Write Y
Unlock (Y)
Unlock (X)
What are object interaction diagrams? Object interaction diagrams are the diagrams that used to describe order in which messages are communicated in execution of an operation,
Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
Control Files : The redo and control files logs support the rest of the architecture. Every database must have at least one control file, although you have more than one to guard
Complexity : A distributed DBMS that is available, reliable, and secure is inherently more difficult than a centralised DBMS. Though, adequate data replication is essential to have
folding method and mid square method using visual basic
Define union compatibility? Explain why INTERSECTION of two relations cannot be performed if they are not union compatible? Two relations R(A1, A2,-------, An) and S(B1, B2,--
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
Question: AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P
let us consider a table having 2200 records and the fixed size of the table to be considered as 25.then how many numbers of table is requredto perform horizontal fragmentation
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
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