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GBase 8c系统表-pg_amproc
2022-07-03 02:18:00 【大壮十二】
pg_amproc系统表存储有关与访问方法操作符族相关联的支持过程的信息。每个属于某个操作符族的支持过程都占有一行。
名称 | 类型 | 引用 | 描述 |
oid | oid | 行标识符(隐藏属性,必须被显式选择才会显示) | |
amprocfamily | oid | pg_opfamily.oid | 使用这个项的操作符族 |
amproclefttype | oid | pg_type.oid | 相关操作符的左手输入数据类型 |
amprocrighttype | oid | pg_type.oid | 相关操作符的右手输入数据类型 |
amprocnum | int2 | 支持过程编号 | |
amproc | regproc | pg_proc.oid | 过程的OID |
amproclefttype和amprocrighttype字段的习惯解释,标识一个特定支持过程支持的操作符的左和右输入类型。对于某些访问方式,匹配支持过程本身的输入数据类型,对其他的则不这样。有一个对索引的“缺省”支持过程的概念,amproclefttype和amprocrighttype都等于索引操作符类的opcintype。
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