ORA-04091:表正在变异，触发器/函数在执行Oracle触发器期间可能看不到它错误 [英] ORA-04091: table is mutating, trigger/function may not see it error during execution of oracle trigger

问题描述

我在下面有一个触发器，其中要在FIELD_NAME字段中将值作为'Deactivation time of KPI in case of Downtime(Select KPI_FREQ_TIME_UNIT FROM KPI_DEFINITION)'插入到FIELD_TRACKING表中.此字符串值中的括号部分来自KPI_DEFINITION表的KPI_FREQ_TIME_UNIT字段.因此，以下是我为此编写的触发器.触发器编译没有任何错误.但是，当我尝试更改KPI_DEFINITION表中的DNTM_REAC_AFTER_HRS字段时，我得到了错误ORA-04091: table RATOR_MONITORING_CONFIGURATION.KPI_DEFINITION is mutating, trigger/function may not see it ORA-04088: error during execution of trigger 'RATOR_MONITORING_CONFIGURATION.TRG_TRK_KPI_DEFINITION'.

I have below trigger in which for FIELD_NAME field i want to insert value into FIELD_TRACKING table as 'Deactivation time of KPI in case of Downtime(Select KPI_FREQ_TIME_UNIT FROM KPI_DEFINITION)'. The bracket part in this string value comes from KPI_FREQ_TIME_UNIT field of KPI_DEFINITION table. So below is the trigger i have wrritten for this. The trigger compile without any error. But when i try to change the DNTM_REAC_AFTER_HRS field from the KPI_DEFINITION table then i am getting error ORA-04091: table RATOR_MONITORING_CONFIGURATION.KPI_DEFINITION is mutating, trigger/function may not see it ORA-04088: error during execution of trigger 'RATOR_MONITORING_CONFIGURATION.TRG_TRK_KPI_DEFINITION'.

create or replace TRIGGER RATOR_MONITORING_CONFIGURATION."TRG_TRK_KPI_DEFINITION" AFTER UPDATE ON RATOR_MONITORING_CONFIGURATION.KPI_DEFINITION
      FOR EACH ROW

    IF NOT  :old.DNTM_REAC_AFTER_HRS=:new.DNTM_REAC_AFTER_HRS THEN
        INSERT INTO RATOR_MONITORING_CONFIGURATION.FIELD_TRACKING  (FIELD_TRACKING_ID,TABLE_NAME,TABLE_ID, FIELD_NAME,FIELD_OLD_VALUE,FIELD_NEW_VALUE,USER_ID, TIMESTAMP, FIELD_TRACKING_COMMENTS)
        VALUES (FIELD_TRACKING_SEQ.NEXTVAL,'KPI_DEFINITION',:new.KPI_DEF_ID,'Deactivation time of KPI in case of Downtime'|| '(' || to_char((Select KPI_FREQ_TIME_UNIT FROM KPI_DEFINITION)) || ')',to_char(:old.DNTM_REAC_AFTER_HRS),to_char( :new.DNTM_REAC_AFTER_HRS),:new.LAST_UPDATED_BY,:new.LAST_UPDATED_DATE, decode(:new.KPI_ACTIVE_DOWNTIME,'N','This KPI has been reactivated on end of a downtime.',''));
      END IF;

    END;

推荐答案

触发器无法读取表(从KPI_DEFINITION中选择KPI_FREQ_TIME_UNIT)，此更改...您可以通过以下方式访问值::new.KPI_FREQ_TIME_UNIT. 更多信息: http://www.dba-oracle.com/t_avoiding_mutating_table_error.htm

Trigger cannot read the table (Select KPI_FREQ_TIME_UNIT FROM KPI_DEFINITION), that changes... you can access the value in this way: :new.KPI_FREQ_TIME_UNIT. More info: http://www.dba-oracle.com/t_avoiding_mutating_table_error.htm

在其他情况下，您可以尝试在自主交易中进行操作:

In other cases you can try to do it in autonomous transaction:

create or replace TRIGGER RATOR_MONITORING_CONFIGURATION."TRG_TRK_KPI_DEFINITION" 
AFTER UPDATE ON RATOR_MONITORING_CONFIGURATION.KPI_DEFINITION FOR EACH ROW
DECLARE
   PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
  -- ...
  COMMIT; -- don't forget it!!!
END;

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