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Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
what is the need of a log in dbms
A Structure of a dependency diagram
Define Atom of domain relational calculus An atom has the outline 1 , x 2 , ... , x n > -> r , in which r stands for a relation on n attributes and x 1 , x 2 , ... , x n ar
external view of DBMS in healthcare department?
Define the terms i) DDL ii) DML DDL: Data base schema is particular by a set of definitions expressed by a special language known as a data definition language. DML: A data
Define Database layer? The database layer defines the data formats used in the database.
Give the general form of SQL query? Select A1, A2............., An From R1, R2..............., Rm Where P
Which database object does not physically exist? A view database object does not physically exist.
Explain the Concept of Two-phase Locking It concerns the positions of locking and unlocking operations in each transaction. In this protocol every transaction issue lock and u
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