# 14. 效能技巧

查詢效能可能會受到很多因素的影響。其中一些可以由使用者控制，而另一些則是系統底層設計的基礎。本章提供了關於理解和調整 PostgreSQL 效能的一些提示。


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.postgresql.tw/15/the-sql-language/performance-tips.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.