Physically, database servers are dedicated computers that hold the actual databases and run only the DBMS and related software. Database servers are usually multiprocessor computers, with generous memory and RAID disk arrays used for stable storage. RAID is used for recovery of data if any of the disks fail. Hardware database accelerators, connected to one or more servers via a high-speed channel, are also used in large volume transaction processing environments. DBMSs are found at the heart of most database applications. DBMSs may be built around a custom multitasking kernel with built-in networking support, but modern DBMSs typically rely on a standard operating system to provide these functions. from databases before the inception of Structured Query Language (SQL). The data recovered was disparate, redundant and disorderly, since there was no proper method to fetch it and arrange it in a concrete structure.[citation needed] COUNT 4
QSN1 What do most database applications contain? ANS1 DBMSs QSN2 What is used to recover data if disks suffer a failure? ANS2 RAID QSN3 How can large quantities of data be accessed? ANS3 Hardware database accelerators QSN4 What is required for a modern DBMS to function? ANS4 standard operating system