问题描述:执行explain plan语句时报错ora-12838,如下所示: HR@orcl150>insert /*+APPEND PARALLEL*/ into t_hr_20230117_new (id,time) select * fromt_hr_20230117; 86396rows created. HR@orcl150>explain plan for insert /*+APPEND PARALLEL*/ into t_hr_20230117_new (id,time) select* from t_hr_20230117; explainplan for insert /*+APPEND PARALLEL*/ into t_hr_20230117_new (id,time) select *from t_hr_20230117 * ERROR atline 1: ORA-12838:cannot read/modify an object after modifying it in parallel 异常原因: 在执行explainplan前的insert语句中用到并行模式插入数据到t_hr_20230117_new表,紧接着该表有用到下一个并行模式的语句里,此种情况需要先提交. 解决过程: HR@orcl150>commit; Commitcomplete. HR@orcl150>explain plan for insert /*+APPEND PARALLEL*/ into t_hr_20230117_new (id,time)select * from t_hr_20230117; Explained. 说明:如上所示,成功执行explainplan语句.
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