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List the drawbacks of relational database system
A) Repetition of data
B) Inability to s certain information.
QUESTION (a)(i) Define the term database. (ii) How is it different from a database management system? (b) What is the difference between an entity and an attribute? (c
Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
Failures and Recovery In practice various things might occur to prevent a transaction from completing. Recovery methods are used to bring database, which does not satisfy consi
Differentiate strict two phase locking protocol and rigorous two phase locking protocol. In strict two phase locking protocol all exclusive mode locks taken by a transaction is
Which operation is used if we are interested in only certain columns of a table? PROJECTION operation is used if we are interested in only certain columns of a table.
What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Consider the entity type dependent related to employee entity, which is used to keep track of the dependents of every employee. The attributes of dependents are: name, sex, birth d
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
What Command You Use What Day of the week were you born
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