System for modifying a database using a transaction log

Details System for modifying a database using a transaction log System for modifying a database using a transaction log

1999-09-03

2000-10-17

Vu, Kim

Data processing: database and file management or data structures

Database design

Data structure types

707 8, 707 10, 707102, G06F 1730

Patent

active

061345628

ABSTRACT:
The present invention is a computer system for modifying a database which comprises a computer that modifies records stored in a database. In the process for modifying records in the database, addresses to memory locations in a disk storage unit are accessed during the commit phase by first checking the address space in a transaction log. The computer system of the present invention operates by committing transactions without locking out readers. This is possible because any changed data in the database is reflected in the transaction log and the log must be accessed prior to reading from the disk storage unit. As a result, the user sees changed data when the log is accessed, or if data has not been changed, the log merely directs the computer to the address in the original database storage where unchanged data is stored.

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