Computer information retrieval technology includes what

Computer information retrieval can be summarized in two parts: information storage and information retrieval.

1, the purpose of information storage is to establish an information base for retrieval. In order to facilitate the search, the need for reasonable organization of information entries, can be organized in the form of documents, can also be organized in the form of databases. Information retrieval system commonly used forms of file organization: sequential files, indexed sequential files, inverted files and clustered files, which used more inverted files and clustered files.

2, information retrieval is offline processing and online retrieval of two retrieval methods. For the former, the user submits a written search request, the operator prints out the results delivered to the user on schedule. For the latter, the user through the on-line terminal to type in the search command, the system then gives the answer. Through the computer network, users can also be remote offline processing or remote online search.

Expanded Information

The confidentiality of a computerized information retrieval system is achieved through an access control mechanism for information entries. For file-system-based information retrieval systems, access control is generally only possible at the file level, i.e., unauthorized users are controlled from retrieving information by checking passwords when opening files.

For the database technology-based retrieval system, access control can be in the file, record, or even in the information entry in an information item level, either by checking the password, but also by calling the user to write the encoding, decoding subroutines to prevent unauthorized users from calling the confidential information.

Baidu Encyclopedia-Computer Information Retrieval