Log-Only Temporal Object Storage

As main memory capacity increases, more of the database read requests will be satis ed from the bu er system. Consequently, the amount of disk write operations relative to disk read operations will increase. This calls for a focus on write optimized storage managers. In this paper we show how the Vagabond object storage manager uses no-overwrite sequential writing of long blocks to achieve high write performance. Vagabond also supports versioned/temporal objects, with the no-overwrite policy used, this does not imply any extra cost. Large objects, e.g., video and matrixes, are divided into large chunks. This makes it easy to achieve high read and write bandwidth. This is important, since in many application areas, high data bandwidth is just as important as high transaction throughput. The bu er system in Vagabond is object based, rather than page based. This gives better utilization of main memory. Transparent compression of objects on disk is supported.

• Type: Conference
• Year: 1997
• Where: DEXAW
• Authors: Kjetil Nørvåg, Kjell Bratbergsengen
• Keywords: Bu Er, Bu Er System, Database, DEXAW 1997, Disk Write Operations