DBMS is a collection of programs that facilitates users to create and maintain a database. Using DBMS, we can overcome many problems such as- data redundancy, data inconsistency, easy access, more organized and understandable, and so on.
What is a database?A Database is a logical, consistent and organized collection of data that it can easily be accessed, managed and updated.
What are the advantages of DBMS?
– Redundancy control– Restriction for unauthorized access– Provides multiple user interfaces– Provides backup and recovery– Enforces integrity constraints– Ensure data consistency– Easy accessibility
What is a checkpoint in DBMS?
The Checkpoint is a type of mechanism where all the previous logs are removed from the system and permanently stored in the storage disk.
When due to a system crash we need to restart the system then at that point we use checkpoints. So that, we don't have to perform the transactions from the very starting.
What do you mean by transparent DBMS?
The transparent DBMS is a type of DBMS that keeps its physical structure hidden from users. Physical structure or physical storage structure implies the memory manager of the DBMS, and it describes how the data is stored on a disk.
What are the unary operations in Relational Algebra?
PROJECTION and SELECTION are the unary operations in relational algebra. Unary operations are those operations that use single operands. Unary operations are SELECTION, PROJECTION, and RENAME.
How many types of database languages are?
Data Definition Language (DDL)Data Manipulation Language (DML)DATA Control Language (DCL)Transaction Control Language (TCL)
The Data model is specified as a collection of conceptual tools for describing data, data relationships, data semantics, and constraints. These models are used to describe the relationship between the entities and their attributes.
What do you understand by Data Model?
The Data model is specified as a collection of conceptual tools for describing data, data relationships, data semantics, and constraints. These models are used to describe the relationship between the entities and their attributes.