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What are the characteristics of database index?

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Database Index characteristic: Primary Key, Unique key columns already have indexes by default. (though you can omit this by specifying to use existing index); Indexes are stored in B-Tree or Hash Tables most of the times. However, some databases allows us options to specify which data structure to use. read more

Database Index characteristic: Primary Key, Unique key columns already have indexes by default. (though you can omit this by specifying to use existing index) Indexes are stored in B-Tree or Hash Tables most of the times. However, some databases allows us options to specify which data structure to use. read more

Because database is a system which gives the platform to store the data, and the data is the one which allows the database to work. Hence there should be clear differentiation between them. There should not be any duplication of data in the database. read more

There are various types of database but the most common is the classical relational database management system (RDBMS) model. This is where data defining a domain, i.e. a real world entity, is organised into tables defined in SQL, and where those tables are connected to each other by relationships. read more

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