Management device

Abstract

A management device (1) is provided with a stream storage section (60) for storing streams each constituted of a plurality of pages, a trace information storage section (52) for storing trace information obtained by associating an extent which is a set of consecutive pages with a write rule indicating writing to the stream storage section or writing to a temporary storage section (70) which temporarily stores the pages to be written to the stream storage section for each of the streams, a reception section (51) for receiving a write request of pages constituting a stream, and a management section (54) for referring to the trace information of the stream to which the pages the write request of which has been received belong, writing the pages to the stream storage section when the write rule associated with an extent to which the pages belong indicates the writing to the stream storage section, writing the pages to the temporary storage section when the write rule indicates the writing to the temporary storage section, and writing the pages written to the temporary storage section in units of extents at predetermined timing.

Description

technical field [0001] The present invention relates to management devices. Background technique [0002] In recent years, database management systems are also used in embedded devices equipped with large-scale storage (storage), such as digital home appliances. In such an embedded device, although the capacity of the main memory is also increased, the capacity is on the order of several KB to several MB, processing can only be performed within a limited resource range, and registration performance and update performance are not so high. [0003] As a technique for coping with insufficient capacity of the main memory, for example, Patent Document 1 discloses a technique related to a shadow page method using a mapping table for recording DB files and temporarily holding page units. The temporarily written file of the updated data of , and the list of updated pages temporarily written in the file. [0004] prior art literature [0005] patent documents [0006] Patent Docu...

AI Technical Summary

Problems solved by technology

In such an embedded device, although the capacity of the main memory is also increased, the capacity is on the order of several KB to several MB, and processing can only be performed within the range of limited resources, and the registration performance and update performance are not so high.

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