Postgresql 中文操作指南

Chapter 11. Indexes

Table of Contents

索引是提高数据库性能的常用方法。索引允许数据库服务器比没有索引时更快地查找和检索特定行。但索引也增加了整个数据库系统的开销,因此应合理使用它们。

Indexes are a common way to enhance database performance. An index allows the database server to find and retrieve specific rows much faster than it could do without an index. But indexes also add overhead to the database system as a whole, so they should be used sensibly.