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Define DBA database administrator?
DBA: A database administrator (DBA) is a person who is responsible for the environmental aspects of a database. In common, these involves:
Recoverability - Creating and testing Backups Integrity - Verifying or helping to verify data integrity Security - Defining and/or implementing access controls to the data Availability - Ensuring maximum uptime Performance - Ensuring maximum performance Development and testing support - Helping programmers and engineers to economically utilize the database
What is a data dictionary? Data Dictionary is a main source of data in a data management system. Its major function is to carry the creation and management of data definition
To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.
Isolation or Independence : The isolation property shows that the updates of a transaction should not be visible till they are committed. Isolation assurance that the progresses of
List any two significant differences between a file processing system and a DBMS. File Processing System vs. DBMS Data Independence - Data independence is the capacity t
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
Control as a State Machine Engine First let us define the state machine: "the state machine is a machine which is an object but not an application object. It is a part of lang
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
Define blocks? The database system resides eternally on non-volatile storage, and is into fixed-length storage units known as blocks.
How can you Start MySQL Server? To start the mysql program type it is name in the command- line prompt. After starting mysql program just display A welcome letter using the
What is an entity relationship model? The entity relationship model is a collection of basic objects known as entities and relationship between those objects. An
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