Download DB2 Universal Database Certification Guide by Dwaine Snow PDF

By Dwaine Snow

Thoroughly revised and up to date with the latest good points of DB2 universal Server model five, this publication takes database directors and alertness builders getting ready for DB2 certification via a self-paced examine the basics of administering and constructing purposes for DB2 universal Server. The CD-ROM comprises trial types of DB2 for Win95/NT/OS2, DB2 software program Developer's package, and DB2 Administrator's Toolkit. .

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For example, when a new process is created, the kernel just assigns the parent’s page frames to the child address space, but marks them read-only. An exception is raised as soon as the parent or the child tries to modify the contents of a page. The exception handler assigns a new page frame to the affected process and initializes it with the contents of the original page. Caching A good part of the available physical memory is used as cache for hard disks and other block devices. This is because hard drives are very slow: a disk access requires several milliseconds, which is a very long time compared with the RAM access time.

When a kernel control path wishes to access the data structure, it executes the down( ) method on the proper semaphore. If the value of the new semaphore isn’t negative, access to the data structure is granted. Otherwise, the process that is executing the kernel control path is added to the semaphore list and blocked. When another process executes the up( ) method on that semaphore, one of the processes in the semaphore list is allowed to proceed. Spin locks In multiprocessor systems, semaphores are not always the best solution to the synchronization problems.

Signals and Interprocess Communication Unix signals provide a mechanism for notifying processes of system events. Each event has its own signal number, which is usually referred to by a symbolic constant such as SIGTERM. There are two kinds of system events: Asynchronous notifications For instance, a user can send the interrupt signal SIGINT to a foreground process by pressing the interrupt keycode (usually Ctrl-C) at the terminal. Synchronous notifications For instance, the kernel sends the signal SIGSEGV to a process when it accesses a memory location at an invalid address.

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