Technology ..... how DES impacts database performance & customer satisfaction
Database Excellerator systems based on SSD technology augmented with patented firmware were developed primarily to address the problem of poor I/O response times on client/server systems. To get I/O throughput speed from a peripheral device, I/O data must be able to utilize the full bandwidth of the SCSI bus, not waiting in an I/O queue limited by the disk processing speed. With today's incredibly fast microprocessor speeds, mechanical devices (standard hard disks) simply cannot keep pace. In general terms, magnetic disks can process about 60 I/Os per second, SSDs can process about 10,000 I/Os per second. Even the fastest mechanical disk spends most of its time, when transferring a block of data, in mechanical delays of moving the head and rotating the disk.
Relational databases are limited by how fast users can retrieve, process, and then safely store data. Multiuser systems find that an I/O bottleneck occurs when users need to access frequently used files or tables, such as indices, temporary sort areas or other "hot" files, to complete their transaction. By moving these frequently used RDBMS temporary tables, transaction logs, or other "hot" files from a magnetic disk onto a DES SSD, processing speeds improve dramatically. And, since the full I/O channel of the SCSI bus is utilized, CPU I/O queue management is virtually eliminated. For example, after moving a frequently used "hot" file to an SSD, our customers have noted RDBMS application performance improvements in the range of 60% to 200%, and in some instances, even higher.
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