Chapter 6 Performance Tips
译：章节6 性能提示
6.1 Small tables of large geometries
译：6.1 大型几何图形的小型表格
6.1.1 Problem description
译：6.1.1 问题描述
Current PostgreSQL versions (including 9.6) suffer from a query optimizer weakness regarding TOAST tables. TOAST tables are a kind of "extension room" used to store large (in the sense of data size) values that do not fit into normal data pages (like long texts, images or complex geometries with lots of vertices), see the PostgreSQL Documentation for TOAST for more information).
译：当前的PostgreSQL版本（包括9.6）在TOAST表方面存在查询优化器的弱点。TOAST表是一种“扩展室”，用于存储不适合正常数据页的大值（从数据大小的意义上讲）（如长文本、图像或具有许多顶点的复杂几何体），有关更
