update问题ORA-02055: distributed update operation failed; rollback required
PS:今天上午，非常郁闷，有很多简单基础的问题搞得我有些迷茫，哎，代码几天不写就忘。目前又不当COO，还是得用心记代码哦！
近来同事遇到一个奇异的问题告急，以下奉上外洋大神的问题重现及解决方法
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ORA-02055: distributed update operation failed; rollback required
You call a remote procedure or package over a database link.
Now, on the other side (the remote side), there was an error encountered, but there were already some statements executed successfully.
Now you will need to perform a rollback before you can do a select on the calling side, or you will get this error.
原因：通过数据库链接调用近程存储过程或包。然而，执行过程当中近程数据库有报错，但是部份语句已胜利执行
措施：在调用端可以查询之前，需要执行回滚操作，否则将获得以上错误提示。
问题重现：
-- First we create some test users SQL> drop user test1 cascade; User dropped. SQL> drop user test2 cascade; SQL> create user test1 identified by test1; User created. SQL> create user test2 identified by test2; User created. SQL> grant create session, create table, create trigger, create procedure, create database link to test1, test2; Grant succeeded. SQL> alter user test1 quota unlimited on system; User altered. SQL> alter user test2 quota unlimited on system; User altered.
Now we connect to test 2 (remote user) and create a table
SQL> conn test2/test2@XE Connected. SQL> create table test2_tab(n number); Table created. SQL> insert into test2_tab values(1); 1 row created. SQL> commit; Commit complete.
In order to demonstrate this error, we create a trigger on the newly created table, but make sure the trigger fails. In our case, we assign a character to a number field:
create or replace trigger test2_tab_bir before insert on test2_tab for each row begin :new.n := 'a'; end; / Trigger created.
Connect to test1, create database link
SQL> conn test1/test1@XE Connected. SQL> SQL> create database link test2 connect to test2 identified by test2 using 'XE'; Database link created.
Now we will create a procedure which will first do a successful dml, after that a dml that fails due to the incorrect trigger:
create or replace procedure p is begin -- first do a statement that executes ok update test2_tab@test2 set n=2; -- next statement will fail because of the invalid trigger insert into test2_tab@test2 values(1); end; / Procedure created.
Call the procedure, it will fail:
SQL> exec p BEGIN p; END; * ERROR at line 1: ORA-02055: distributed update operation failed; rollback required ORA-06502: PL/SQL: numeric or value error: character to number conversion error ORA-06512: at "TEST2.TEST2_TAB_BIR", line 2 ORA-04088: error during execution of trigger 'TEST2.TEST2_TAB_BIR' ORA-02063: preceding 3 lines from TEST2 ORA-06512: at "TEST1.P", line 4 ORA-06512: at line 1
Now we have a failed distributed transaction, you need to rollback, else you will get the error when selecting ANY table/view
SQL> select sysdate from dual;
select sysdate from dual
*
ERROR at line 1:
ORA-02067: transaction or savepoint rollback required
-- also happens when oracle itself calls another select recursively (notice the ORA-00604)
SQL> select * from user_2pc_pending;
select * from user_2pc_pending
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-02067: transaction or savepoint rollback required
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Present By Dylan.
文章结束给大家分享下程序员的一些笑话语录： 女人篇
有的女人就是Windows虽然很优秀，但是安全隐患太大。
有的女人就是MFC她条件很好，然而不是谁都能玩的起。
有的女人就是C#长的很漂亮，但是家务活不行。
有的女人就是C++,她会默默的为你做很多的事情。
有的女人就是汇编虽然很麻烦，但是有的时候还得求它。
有的女人就是SQL，她会为你的发展带来莫大的帮助。
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update和问题
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