Locking in Concurrency  Control A variable that is connected with a data item and specifies the item's current stat…

Relational Calculus In DBMS, Relational Calculus is a unique technique to query creation. Relational calculus in DBMS i…

Relational Algebra   Relational algebra is a procedural query language that accepts instances of relations and returns …

Indexes SQL indexes are specialized lookup tables that help the database search engine get data faster.  In simple word…

Integrity Constraints Integrity constraints are guidelines that support maintaining the consistency and correctness of …

ER Model  ER Model stands for Entity-Relationship Model. A diagram is used in an entity-relationship model to show the …

Weak Entity Types  Entity types  An entity type is a grouping of entities that share common characteristics. A corporat…

Attribute in DBMS An entity is any object or thing that can be distinguished from other objects in a database managemen…

Benefits or Advantages of Normalization  1. Reduces Size Normalized data occupies the same space as unnormalized data, …

Database Management System A software program for building and maintaining databases is called a database management sy…

Database Security Database security is an essential part of modern technology and business. Organizations continue to c…

Relation A relational database uses tables, records, and columns to gather many kinds of data sets. In order to facilit…

Definition  In database management systems, an entity set is a grouping of related entity types in a database. A set is…

Relational Model  A method for managing and logically representing the data kept in a database is the relational model …

Definition Data in the database must be stored, retrieved, and updated by a program module called a storage manager. Th…