JP2012128596A5

JP2012128596A5 -

Info

Publication number: JP2012128596A5
Application number: JP2010278564A
Authority: JP
Filing date: 2010-12-14
Publication date: 2014-02-06
Anticipated expiration: 2030-12-14

Description

すなわち、データベースファイルに書き込むためのデータを保持するローカル保持手段と、前記ローカル保持手段に保持されたデータを、前記データベースファイルに対するファイルキャッシュ保持手段に書き込む仮想コミット手段と、前記ファイルキャッシュ保持手段に保持されたデータを前記データベースファイルに書き込むコミット手段と、前記コミット手段が前記データベースファイルに書き込みを実行している間に前記データベースファイルのデータの出力を要求された場合、前記ファイルキャッシュ保持手段に保持されたデータを要求されたデータとして出力する出力手段とを有するデータベースシステムである。 That is, local holding means for holding data to be written to the database file, virtual commit means for writing data held in the local holding means to the file cache holding means for the database file, and holding in the file cache holding means Commit means for writing the data to the database file, and when the commit means is requested to output data of the database file while the commit file is being written to the database file, the data is held in the file cache holding means. A database system having output means for outputting the received data as requested data.

Claims

Local holding means for holding data for writing to the database file;
Virtual commit means for writing data held in the local holding means to a file cache holding means for the database file;
Commit means for writing the data held in the file cache holding means to the database file;
An output means for outputting the data held in the file cache holding means as the requested data when the commit means is requested to output data of the database file while executing writing to the database file; A database system comprising:

The database system according to claim 1, further comprising journal holding means for holding data before update corresponding to data updated by the commit means.

Rollback means for overwriting the data held in the file cache holding means by the virtual commit means based on the data held in the journal holding means before the commit means executes writing to the database file. The database system according to claim 2, further comprising:

An information processing method executed by a database system,
A virtual commit step in which the virtual commit means of the database system writes data for writing to the database file held in the local holding means to the file cache holding means for the database file;
A commit unit that the database system has, a commit step of writing the data held in the file cache holding unit into the database file;
When the output unit of the database system is requested to output data of the database file while the commit unit executes writing to the database file, the output unit requests the data held in the file cache holding unit. An information processing method comprising: an output step of outputting the processed data.

A program for causing a computer to execute processing of each step of the information processing method according to claim 4.