Here are 50+ Question that you must read to pass your interview with ease.....
What is a database?
A database is a structured collection of data that can be stored and retrieved electronically.
What is DBMS?
DBMS stands for Database Management System. It is a software system that allows users to define, create, maintain, and control access to a database.
What are the advantages of using a DBMS?
Advantages of using a DBMS include improved data sharing, data security, data consistency, and data integrity, as well as improved data access and data management.
What is normalization?
Normalization is the process of organizing data in a database to reduce data redundancy and improve data integrity.
What is a primary key?
A primary key is a unique identifier for each record in a table. It is used to enforce the integrity of the data in the table.
What is a foreign key?
A foreign key is a field in one table that refers to the primary key of another table. It is used to establish relationships between tables.
What is a transaction?
A transaction is a sequence of operations that are executed as a single unit of work. It is typically used to ensure the consistency of data in a database.
What is a join?
A join is an operation that combines data from two or more tables based on a common field.
What is a view?
A view is a virtual table that is derived from one or more tables in a database. It is used to simplify complex queries and to provide a higher level of security.
What is a trigger?
A trigger is a piece of code that is executed automatically in response to a certain event, such as an insert, update, or delete operation.
What is a cursor?
A cursor is a mechanism that is used to traverse the records in a database. It is typically used in conjunction with a select statement.
What is a subquery?
A subquery is a query that is embedded within another query. It is used to retrieve data from one or more tables based on a condition.
What is an index?
An index is a data structure that is used to improve the performance of data retrieval operations in a database.
What is a clustered index?
A clustered index is an index that determines the physical order of data in a table. It is ideal for columns that are frequently searched and sorted.
What is a non-clustered index?
A non-clustered index is an index that is created separately from the table and does not determine the physical order of data in the table. It is ideal for columns that are infrequently searched and sorted.
What is a composite index?
A composite index is an index that is created on two or more columns in a table. It is used to improve the performance of queries that involve multiple columns.
What is a B-tree index?
A B-tree index is a type of index that is used to quickly find the relevant leaf nodes, which contain pointers to the data in the table.
What is a hash index?
A hash index is a type of index that is used to quickly find the relevant data using a hash function.
What is a full-text index?
A full-text index is an index that is used to improve the performance of full-text search operations in a database.
What is a deadlock?
A deadlock is a situation in which two or more transactions are waiting for each other to release a resource, causing them to be stuck in a loop.
What is a data warehouse?
A data warehouse is a large, centralized repository of data that is used for reporting and analysis.
What is ETL?
ETL stands for Extract, Transform, and Load. It is the process of extracting data from multiple sources, transforming it into a consistent format, and loading it into a data warehouse.
What is OLAP?
OLAP stands for Online Analytical Processing. It is a technology used to analyze data in a multidimensional view.
What is a data mart?
A data mart is a subset of a data warehouse that is designed to serve a specific business function or department.
What is a database schema?
A database schema is the structure of a database, including tables, fields, relationships, and constraints.
What is a database trigger?
A database trigger is a piece of code that is executed automatically in response to a certain event, such as an insert, update, or delete operation.
What is a stored procedure?
A stored procedure is a set of SQL statements that are stored in a database and can be called by other programs or scripts.
What is a database cursor?
A database cursor is a mechanism that is used to traverse the records in a database. It is typically used in conjunction with a select statement.
What is SQL injection?
SQL injection is a type of security vulnerability in which an attacker injects malicious SQL code into a web application, allowing them to access or modify sensitive data.
What is normalization?
Normalization is the process of organizing data in a database to reduce data redundancy and improve data integrity.
What is denormalization?
Denormalization is the process of intentionally adding redundant data to a database in order to improve performance.
What is a database backup?
A database backup is a copy of a database that is used to restore data in the event of a system failure or data loss.
What is a database restore?
A database restore is the process of restoring data from a database backup.
What is a database transaction?
A database transaction is a sequence of operations that are executed as a single unit of work. It is typically used to ensure the consistency of data in a database.
What is a database index?
A database index is a data structure that is used to improve the performance of data retrieval operations in a database.
What is a database constraint?
A database constraint is a rule that is enforced on the data in a database to ensure its accuracy and consistency.
What is ACID?
ACID stands for Atomicity, Consistency, Isolation, and Durability. It is a set of properties that ensure the reliability of transactions in a database.
What is a database lock?
A database lock is a mechanism that is used to prevent two or more transactions from accessing the same data simultaneously.
What is a database view?
A database view is a virtual table that is derived from one or more tables in a database. It is used to simplify complex queries and to provide a higher level of security.
What is a database trigger?
A database trigger is a piece of code that is executed automatically in response to a certain event, such as an insert, update, or delete operation.
What is a database schema?
A database schema is the structure of a database, including tables, fields, relationships, and constraints.
What is a database role?
A database role is a set of permissions that are assigned to a user or group of users in a database.
What is a database connection?
A database connection is a communication pathway between a database and a client application.
What is a database cursor?
A database cursor is a mechanism that is used to traverse the records in a database. It is typically used in conjunction with a select statement.
What is a database transaction log?
A database transaction log is a record of all changes that have been made to a database. It is used to recover data in the event of a system failure or data loss.
What is a database index scan?
A database index scan is a method used to retrieve data from an index in a database. It is typically used when searching for specific data in a large database.
What is a database deadlock?
A database deadlock is a situation where two or more transactions are waiting for each other to release locks on data in a database, resulting in a stalemate.
What is a database query?
A database query is a request for data from a database. It is typically expressed in SQL and is used to retrieve, insert, update, or delete data.
What is a database schema diagram?
A database schema diagram is a visual representation of the structure of a database, including tables, fields, relationships, and constraints.
What is a database data dictionary?
A database data dictionary is a repository of metadata that describes the structure of a database, including tables, fields, relationships, and constraints.
What is a database constraint violation?
A database constraint violation occurs when data is entered into a database that violates a constraint, such as a primary key or foreign key constraint.
What is a database join?
A database join is a method used to combine data from two or more tables in a database. It is typically used to retrieve data that is spread across multiple tables.
What is a database normalization form?
A database normalization form is a set of rules that describe how to organize data in a database to reduce data redundancy and improve data integrity.
What is a database denormalization technique?
A database denormalization technique is a method used to intentionally add redundant data to a database in order to improve performance.
What is a database sharding?
A database sharding is a technique used to distribute data across multiple servers in a database cluster to improve performance and scalability.
What is a database backup strategy?
A database backup strategy is a plan that outlines how to create and store backups of a database to ensure that data can be recovered in the event of a system failure or data loss.
What is a database replication?
A database replication is a technique used to create multiple copies of a database to improve performance, scalability, and reliability.
What is a database partitioning?
A database partitioning is a technique used to divide a database into smaller, more manageable segments to improve performance and scalability.
What is database monitoring?
Database monitoring is the process of monitoring the performance and availability of a database to ensure that it is operating correctly and efficiently.
What is a database maintenance plan?
A database maintenance plan is a set of tasks and procedures used to optimize the performance and reliability of a database over time.
What is a database migration?
A database migration is the process of moving a database from one platform to another, such as from on-premise to cloud-based.
What is a database encryption?
Database encryption is the process of converting data in a database into an unreadable format to protect it from unauthorized access.
Thanks for reading, and happy coding!
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