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【译】oracle join 方式(Oracle? Database Performance Tuning Guide)

英文原文地址:Overview of Joins

@todo 翻译完毕,暂时保留原英文。对照校验完后删除应用,保持完整中文版本。

Joins?are statements that retrieve data from multiple tables. A join is characterized by multiple tables in the?FROM?clause. The existence of a join condition in the?WHERE?clause defines the relationship between the tables. In a join, one row set is called inner, and the other is called outer.?Join 是从多个表中获取数据的语句。join的特点是在From子句[......]

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【译】Oracle 索引(Oracle? Database Concepts)

比较完整权威的oracle的索引的介绍还是在来自于Oracle? Database Concepts翻译下。

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Indexes and Index-Organized Tables

This chapter discusses indexes, which are schema objects that can speed access to table rows, and index-organized tables, which are tables stored in an index structure.

This chapter contains the following sections:

Overview of[......]

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【译】顺序聚类

@todo 翻译下文
原文地址:Sequential Clustering
Sequential Clustering

Sequential algortihms are pretty fast and straightforward methods, which tend to produce compact clusters. All the feature vectors are presented to the algorithm only once or just a few times, and the final clustering is usually strongly dependent on the presenting order of the data.

 

Basic Sequential Algorithmic Scheme – B[......]

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【译】识别NAT设备

@todo 翻译该文章

原文: Detecting NAT Devices using sFlow

Detecting NAT Devices using sFlow

Peter Phaal, sFlow.org

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Overview

Unauthorized NAT (Network Address Translation) devices can be a significant security problem. Typically the NAT device will appear to the network administrator as an end host and it will authenticate itself onto the network. However, the NAT device provides unrestricted a[......]

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