pg_am
pg_catalog 模式中的 pg_am 表用于存储索引访问方法的相关信息。系统支持的每种索引访问方法都对应表中的一行记录。
| 列名 | 类型 | 引用 | 描述 |
|---|---|---|---|
oid | oid | 行标识符（隐藏属性；需显式选择） | |
amname | name | 访问方法的名称 | |
amhandler | regproc | 负责提供访问方法信息的处理函数的 OID | |
amtype | char | t 表示表（包括物化视图），i 表示索引 |
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