ORA-12838: cannot read/modify an object after modifying it in parallel

最新推荐文章于 2024-06-04 13:30:43 发布

最新推荐文章于 2024-06-04 13:30:43 发布 · 84 阅读

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本文介绍了在Oracle数据库中使用并行插入(insert/*+append*/)时遇到的问题及解决办法。当在同一事务内尝试对已进行过并行修改的表执行读取或修改操作时，会触发ORA-12838错误。文章提供了避免该错误的方法。

如果用了insert /*+ append */ into table as select .. from table 这样的操作来insert，必须在操作后commit,或是rollback,不然就不能再insert /*+ append */ into table as select .. from table 。

ORACLE报出错误如下:

ORA-12838: cannot read/modify an object after modifying it in parallel

解释如下：

ORA-12838 cannot read/modify an object after modifying it in parallel
Cause: Within the same transaction, an attempt was made to add read or modification statements on a table after it had been modified in parallel or with direct load. This is not permitted.
Action: Rewrite the transaction, or break it up into two transactions: one containing the initial modification and the second containing the parallel modification operation

insert /*+ append */ into table 操作对于这个表的锁级为6，而insert 操作对这个锁级为3 ，在同一session下，执行了上面这个操作，没有提交/回滚事务，然后有对table进行 select....等操作就会报上面的错误

我的过程中跑了3.55个小时后很郁闷哦！

insert /*+append*/ into table a

select * from c;

insert /*+append*/ into table a

select * from b

end if