ORA-64140: missing chaining XMLTABLE for VIRTUAL column in the index ORACLE 报错 故障修复 远程处理
文档解释
ORA-64140: missing chaining XMLTABLE for VIRTUAL column in the index
Cause: An attempt was made to create an XML index with VIRTUAL column but without required chaining XMLTABLE.
Action: Specify a chaining XMLTABLE after VIRTUAL column.
ORA-64140:XMLTABLE中缺少虚拟列的索引
官方解释
此错误消息指示没有在XMLTABLE中使用VIRTUAL COLUMN中定义的索引,这是与使用XMLTABLE相关的索引不一致性错误。
常见案例
下面是一个未正确抓取索引以对应VIRTUAL COLUMN的示例:
CREATE TABLE vc_table
(
col1 VARCHAR2(10),
col2 VARCHAR2(20)
);
CREATE INDEX vc_index ON vc_table(col1, UPPER(col2) );
SELECT x.* FROM
XMLTABLE(‘…’
PASSING xmltag
COLUMNS a VARCHAR2(10) PATH ‘a’,
b VARCHAR2(20) PATH ‘b’
) x
WHERE x.a = ‘foo’ AND UPPER(x.b) = ‘BAR’;
一般处理方法及步骤
要解决此问题,请把你的查询修改为正确使用索引的方式。
上面的示例对应下面的查询:
SELECT x.* FROM
XMLTABLE(‘…’
PASSING xmltag
COLUMNS a VARCHAR2(10) PATH ‘a’,
b VARCHAR2(20) PATH ‘b’
, UPPER(b) VIRTUAL COLUMN
) x
WHERE x.a = ‘foo’ AND x.UPPER_B = ‘BAR’;