What is the directory service?
On the outside, the directory service appears a similar large database. The directory supports a large amount of data and data is organized according to the node and value. The directory service catalogs different information depending on its focus. For example, the network directory service catalogizes all sources on the computer, while the directory directory of the domain name (DNS) Catalogs of websites. The differences between the directory and the database are that the directory may include redundant information and directory are read more than written, so many write commands are omitted.
The directory service appears to be a database. It holds similar data and organizes each piece into a node format and value, similar to some hierarchical and relational database models. The node in the directory is primary, while the value is a string of data connected to the node. If the directory for the telephone book was, the node would be a name, while the value would be a studio number corresponding to the name.
directory can be created for many purposes. The network directory describes in detail all software and hardware on your computer, but rarely requires the user to know about the directory or how to access hardware or software. The DNS directory takes the domain names of web pages and creates a domain based on a web number that the user rarely sees. The directory technology is versatile, but the directory should be created for only one purpose or the information may clash.
While similar database models have some big differences. In the database, if redundant or recurring information is stored in the tables, the database can cause the database to be accidentally connected by really unrelated data or creates programming problems. In the directory, the information may be redundant. For exampleElephone numbers.
The directory service can be read and written, but it is read more often. The result is many registration commands found in database technology that is not included in the directory. Returns and transactions are limited because the directory simply does not need them.
Each directory service must contain a plan. This plan is a set of rules programmed to the directory that says the directory, what information is important, what should be collected and what information needs to be ignored. Without a plan, the directory would try to absorb all the information, which would cause overload.