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Define the phases of two phase locking protocol
Growing phase: a transaction may get locks but not release any lock.
Shrinking phase: a transaction might be release locks but may not get any new locks.
A constraint named less_than_20 was defined on the field date_of_birth of table student. Delete this constraint. ALTER TABLE student DROP CONSTRAINT less_than_20;
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
Question: One of the tasks a database management system must perform is to ensure that the data is still intact in the face of software and hardware failure. This task is known
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
Consistency: This property makes sure that a complete transaction implementation takes a database from one consistent state to another consistent state. If the transaction fails e
brief history,definition,current trends and future trends if any of data fragmentation
explain equi-join using illustration
what is attribute is attribute inheritance in dbms?
What is Relational Algebra? Relational algebra is a Procedural query Language?
various techniques of hashing?
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