每个数据库的Postgresql关系限制

在Postgresql文档附录K（）中有一个限制列表：

+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| Item                   | Upper Limit                                                           | Comment                                                                |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| database size          | unlimited                                                             |                                                                        |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| number of databases    | 4,294,950,911                                                         |                                                                        |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| relations per database | 1,431,650,303                                                         |                                                                        |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| relation size          | 32 TB                                                                 | with the default BLCKSZ of 8192 bytes                                  |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| rows per table         | limited by the number of tuples that can fit onto 4,294,967,295 pages |                                                                        |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| columns per table      | 1600                                                                  | further limited by tuple size fitting on a single page; see note below |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| field size             | 1 GB                                                                  |                                                                        |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| identifier length      | 63 bytes                                                              | can be increased by recompiling PostgreSQL                             |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| indexes per table      | unlimited                                                             | constrained by maximum relations per database                          |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| columns per index      | 32                                                                    | can be increased by recompiling PostgreSQL                             |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+
| partition keys         | 32                                                                    | can be increased by recompiling PostgreSQL                             |
+------------------------+-----------------------------------------------------------------------+------------------------------------------------------------------------+

“每个数据库的关系”一行是指数据库中每行的关系总数，或者是声明的外键数

例如，有一个外键连接两个表的两个表在数据库中算作1个关系？或者作为1*行（1.000行等于1.000关系）

非常感谢您的帮助：）

请参见此处：

关系本质上是表的一个数学术语

---

“关系”是存储在目录表

pg_class

中的任何内容：表、视图、序列、索引、物化视图、分区表和分区索引

这个限制主要是理论上的，实际上，如果你有100000个左右的关系，你会遇到麻烦。

“关系”可能意味着表、视图等。