Database management is the method for managing information that supports the business operations of an organization. It involves storing and distributing data it to users and applications and editing it as required, monitoring data changes, and preventing data corruption due to unexpected failure. It is a part of the overall informational infrastructure of a company that assists in decision making as well as corporate growth and compliance with laws like the GDPR and California Consumer Privacy Act.
In the 1960s, Charles Bachman and IBM among others came up with the first database systems. They evolved into information management systems (IMS) which allowed for the storage and retrieve large amounts data for a wide range of uses, from calculating inventory to supporting complex human resources and financial accounting functions.
A database is a set of tables that arrange data according to a particular schema, such as one-to many relationships. It utilizes primary keys to identify records and allows cross-references between tables. Each table has a set of fields, known as attributes, which provide information about the data entities. Relational models, created by E. F. “TedCodd Codd in the 1970s at IBM, are the most widely used type of database in the present. This design is based upon normalizing data to make it thecinema.gr more user-friendly. It is also easier to update data because it doesn’t require the modification of several databases.
Most DBMSs support multiple types of databases and offer different internal and external levels of organization. The internal level is concerned with cost, scalability, as well as other operational issues, including the physical layout of the database. The external level is the representation of the database on user interfaces and applications. It can include a mixture of different external views that are based on different data models and may also include virtual tables that are computed using generic data to improve the performance.