as the extending of the distributed database,The problem of the multi-join query optimization largely influence the efficiency of the data query,but traditional optimization techniques for multi-join query are inadequate to support some of the database applications.

The algorithm of multi-join query optimization based on genetic algorithm with overall search ability and simulated annealing with local search ability are proposed by combining with characteristic of multi-join optimization.

An XML algebra and query optimization based on algebra;

Value-based query optimization algorithm;

Methods of query optimization based on MS SQL Server;

The Inquiry Optimization in The Distributed Data Base System;

A discussion of inquiry optimization in database;

This paper describes the usual steps and the realizing means to the inquiry optimization in RDBMS.

This article mainly discusses the function and the realization method of query optimize technology in RDB(relation database).

Base on the traditional query optimize technologies analyse , Object-Oriented Method (OO) is recommended to set up aOO model by 7 abstract class which is from the analyse of the SELECT syntax structure.