Most of the present DMBSs have parameters to set the size of data buffer caching in a memory, and disc I/O can be reduced, as the buffer size is greatly reduced, because data pages caching in a buffer increase. Whereas greatly setting this parameter value makes a memory occupy a system excessively, and the buffer pool may be swapped by system's operating system.This article compared and analyze...

Network throughput can be increased by dividing the buffer storage associated with each network channel into several virtual channels [DalSei]. Each physical channel is associated with several small queues, virtual channels, rather than a single deep queue. The virtual channels associated with one physical channel are allocated independently but compete with each other for physical bandwidth. V...

The use of flash-based solid state drives (SSDs) in storage systems is growing. Adding SSDs to a storage system not only raises the question of how to manage the SSDs, but also raises the question of whether current buffer pool algorithms will still work effectively. We are interested in the use of hybrid storage systems, consisting of SSDs and hard disk drives (HDDs), for database management. ...

It is generally accepted that the trends in ubiquitous and pervasive computing are rapidly increasing the diversity and heterogeneity of wireless technologies and their constituent devices. However, there are significant problems to overcome when integrating embedded and mobile devices into a ubiquitous and pervasive computing environment. One can consider that flash memory is an essential stor...

We examine the problem of scheduling concurrent independent flows on multiple-disk I/O storage systems. Two models are considered: in the shared buffer model the memory buffer is shared among all the disks, while in the partitioned buffer model each flow has a private buffer. For the parallel disk model with d > 1 disks it is shown that the problem of minimizing the schedule length of n > 2 con...

Flash memory has become the most important storage media in mobile devices, and is beginning to replace hard disks in desktop systems. However, its relatively poor random write performance may cause problems in the desktop environment, which has much more complicated requirements than mobile devices. While a RAM buffer has been quite successful in hard disks to mask the low efficiency of random...

We describe and demonstrate a volume holographic storage system in which a phase-conjugate object beam is reconstructed by the same reference beam that was used for recording. An intermediate hologram is used as a temporary buffer, recorded with its own reference beam and the data-bearing object beam. Reading this buffer hologram with the phase conjugate of its reference beam reconstructs the p...

Caching is a classical but effective way to improve system performance. To improve system performance, servers, such as database servers and storage servers, contain significant amounts of memory that act as a fast cache. Meanwhile, as new storage devices such as flash-based solid state drives (SSDs) are added to storage systems over time, using the memory cache is not the only way to improve s...

The rapid growth in telecommunication traffic demands a higher-speed asynchronous transfer mode (ATM) switching system. At present, the upper limit of the system clock rate is determined by the maximum clock rate of conventional semiconductor memory devices, such as the register files used in ATM cell buffer storage. This is because the maximum clock rate of these register files is restricted b...