Reservoir of experience and optimize the process of preparing measures to choose from swazn_yj's Blog I. Introduction: After a period of time after the stored procedure development, and write a brief summary of a number of development time and ex ...
Inquiries are many reasons for slow, frequently asked the following: 1, there is no index or index is not used (this is the most common query slow problem is programming defects) 2, I / O throughput in a small, forming a bottleneck effect. 3, did not ...
In the distributed query, the local DB will be remote access to the data table linked to the rational use of DRIVING_SITE, distributed queries can significantly reduce network traffic, speeding up the query speed. The hint instructs the optimizer to ...
ORACLE Million Data Query Optimization Guide Quoted from: http://user.qzone.qq.com/123097165 rn 1. Optimize the query should avoid full table scan, the first consideration involved in the rnwhere and order by columns to index. rn 2. Should be avoided ...
