Concurrency in a Database is a procedure of managing simultaneous operations without conflicting with each other. A database transaction symbolizes a unit of work performed within a database management system against a database. Hashing in a Database Management System is a procedural approach applied to rationally find the position of the required data.
Indexing is a way of optimizing the performance of a database by minimizing the number of disk accesses required when a query is processed. Indexing, Hashing, Transaction & Concurrency.A NoSQL database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases. SQL is a domain-specific language that lets you access and manipulate databases. Joins combine data from multiple tables in relational databases. Normalization is the process of organizing data in a database to reduce data redundancy and eliminate undesirable characteristics like Insertion, Update, and Deletion Anomalies. The Relational Model represents how data is stored in Relational Databases and the Entity-Relationship Model defines the conceptual view of a database. Relational model and Entity-Relationship Model.Data independence is the ability to modify a schema definition in one level without affecting a schema definition in the next higher level. Data Schemas are the skeleton structure that shows the structure of the entire database.
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