Since the read speed of the memory is much higher reading speed of external memory devices, thereby increasing the speed of operation is ensured. And the information is exchanged through this buffer. For this purpose, a buffer (cache) is created in the RAM with the data that is currently being used. To increase user interaction with the database, the so-called buffering of data in the RAM is used. The speed of processing information depends on the size of the database. One of the important characteristics of a database management system is the speed of processing information in the database. What is the management of the memory buffers? can use low-level operations when working with external storage devices.can use the capabilities of existing file systems (storage devices).To provide direct data management in external memory, modern DBMS: The user should not think about the features of the DBMS at the lower level. For any DBMS, the work with the file system of any other external memory device is important.
For example, to provide quick access to data using indexes.Īs a rule, the database management system uses its own mechanism for working with external memory devices (external storage devices). to save the immediate data of the database.Information carriers are needed in two cases:.What does it mean to directly manage data in external memory?Īs is known, in order to preserve data and work with them, permanent data storage devices (storage media), for example hard disks, must be available in the database.
#Importance of database management system pdf serial
What is serialization and a serial transaction plan? Why does it need to manage transactions in the database? What is a transaction? What does transaction management mean? What does it mean to directly manage data in external memory? Functions of database management systems (DBMS)