- 1 databases 1.1 Concepts databases 1.2 features databases 1.3 Examples of databases 1.4 combinations of databases 1.5 Types of database files
- 1.1 Concepts databases
- 1.2 features databases
- 1.3 Examples of databases
- 1.4 combinations of databases
- 1.5 Types of database files
Databases are a collection of associated data with each other mathematical relationships, and consists database from one table or more, as the table consists of a set of one or more records, and consists of the record of one or more fields, the primary objective of the databases is to organize data in a manner free of redundancy, it can be retrieved, and modify them, and save them with ease, using a dedicated system for so-called system database management.
At present databases are widely used in all institutions, companies and ministries, where it regulates the work of these institutions and facilitated by, the staff was also able to access to their data with ease, unlike paper data stored in the files.
Of important terminology associated with the databases The term database management system; It is a set of programs through which the creation and processing of databases, and remained to mention that the data is a symbols of letters, numbers, and words are processed computer, which is the foundation on which it is based databases.
- Speed data access and retrieval.
- Reduce the space used.
- Data integration and participation.
- Security and confidentiality.
- Provide an opportunity to work reports.
Examples of databases
- Berkeley database.
- Relational installation: a process relying on a specific type of relationships between data elements; Such as: to be an element depends on the value of the sum of two components of data, this type of the most successful structures in the world of relational databases; Because it gives a great opportunity in the diversity of the types of relationships between data, and thus provides a greater opportunity to implement the relationships between the data.
- Structural Composition: It is relying on the organizational structure of the data, such as to be two elements belonging to another element or indexers underneath it.
- Hierarchical structure: the adoption of the pyramid relationship between data elements, each element of which shall be responsible for only one of them an item.
Types of database files
- File arpeggio: and where data is stored in sequential records, so access to the log on after passing all the records that precede it.
- Random file: where stored data records in which randomly with the knowledge of the address of each record, read this log data by address.
- Indexed: where data is stored and accessed through the file is similar to an index catalog of the book is placed in one of the data fields.
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