ORA-55568: The maximum query length (mql) value should be atmost string based on the current _highthreshold_undoretention setting. ORACLE 报错 故障修复 远程处理
文档解释
ORA-55568: The maximum query length (mql) value should be atmost string based on the current _highthreshold_undoretention setting.
Cause: The maximum query length (mql in minutes) was not less than or equal to half the _highthreshold_undoretention parameter setting.
Action: Reissue the SQL statement with a lower value for mql or increase the value of _highthreshold_undoretention parameter.
ORA-55568错误指明当前设置的_highthreshold_undoretention设置太高,以致最大查询长度(mql)值也受到限制,因此会引起该错误。
官方解释
常见案例
ORA-55568的错误通常会在尝试在数据库上运行超长的查询时发生,其中执行的查询总长度高于mql参数当前设置的最大值。
一般处理方法及步骤
要解决ORA-55568错误,您需要首先检查当前设置的_highthreshold_undoretention参数值,确保其值小于或等于最大查询长度(mql)设置的值,然后根据需要调整最大查询长度(mql)参数的值,以便满足您的请求要求。