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What functions does a data dictionary perform?
In a (DBMS)data management system, the principal functions performed by the data dictionary are
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
examples of fields in a database
Name the various privileges in SQL? A) Delete B) Select C) Insert D) Update
Define the basic operations of the relational algebra? Ans: Basic operators of relational algebra are: 1. Union (∪) - Selects tuples which are in either P or Q or in bot
In an E-R diagram an entity set is represent by? In an E-R digram entity set is represted by rectangle.
aggregation
write short note on mobile database
Explain controlled redundancy? Controlled redundancy : The replication of data within the data warehouse for the purposes of improved data access or understand ability.
Explain Deadlock detection and recovery Deadlock Detection - A deadlock is said to take place when there is a circular chain of transaction, every waiting for the release of a
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
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