In shared-nothing multipocessor database machines, the storage organization for a relation is independent of the strategy used to decluster the relation. A database administrator for such a system has a wide range of alternatives when creating a relation. In this paper, we analyze the impact of three alternative declustering strategies on the performance of the selection queries using different...

Parallel le systems employ data declustering to increase I/O throughput. But because a single read or write operation can generate data accesses on multiple independent storage devices, a concurrency control mechanism must be employed to retain familiar le access semantics. Concurrency control negates some of the performance beneets of data declustering by introducing additional le access overh...

RAID, as a popular technology to improve the performance and reliability of storage system, has been used widely in computer industry. Recently, the technique of designing data layout in order to fit the requirements of networked storage is becoming a new challenge in this field. In this paper, we present a double-objective Genetic Algorithm for parity declustering optimization in networked RAI...

Estimating the conditional intensity of a self-exciting point process is particularly challenging when both exogenous and endogenous effects play a role in clustering. We propose maximum penalized likelihood estimation as a method for simultaneously estimating the background rate and the triggering density of Hawkes process intensities that vary over multiple time scales. We compare the accurac...

Declustering aims to divide earthquake catalogs into independent events (mainshocks), and dependent (clustered) events, is an integral component of many seismicity studies, including seismic hazard assessment. We assess the effect declustering on frequency-magnitude distribution mainshocks. In particular, we examine dependence b-value declustered choice approach algorithm-specific parameters. U...

In this paper, we explore the method of combining the replication and parity approaches to tolerate multiple disk failures in a disk array. In addition to the conventional mirrored and chained declustering methods , a method based on the hybrid of mirrored-and-chained declustering is explored. A performance study that explores the eeect of combining replication and parity approaches is conducte...