ORA-01940错误的解决过程

在将每天的DMP逻辑备份导入到一个数据库的过程中，在导数据之前的不能删除用户操作出现下面的错误：

OS:linux

Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production

SQL> drop user test cascade;

drop user test cascade

*

第 1 行出现错误:

ORA-01940: cannot drop a user that is currently connected

解决：

查找原因，是由于在原来DMP逻辑备份中test用户下的数据中存在job，由于在导入数据时这些job已经开始执行，所以造成在进程中存在

该test用户执行JOB任务的会话，说明该用户正在被使用，所以该用户是不能被drop掉的

下面的ORA-01940错误的复现过程：

创建测试表

drop table test1　

select * from test1

create table test1 (datetime date);　

　　

创建一个自定义过程

create or replace procedure MYPROC as

begin

for i in 1..100000 loop

insert into TEST1(datetime) values(sysdate);

end loop;

end;

PL/SQL procedure successfully completed

创建JOB,每天1440分钟，即每5分钟运行test过程一次

declare

job number;

begin

sys.dbms_job.submit

(job => job,

what =>'MYPROC;',

next_date => sysdate,

interval => 'sysdate+(1/1440)*5');

commit;

end;

PL/SQL procedure successfully completed

　　

运行JOB

SQL> begin

2 sys.dbms_job.run(241);

3 end;

4 /

PL/SQL procedure successfully completed

此时需要删除用户daimin时，就会报下面的错误

以sys登陆系统，删除daimin用户

--查看daimin用户下的job

SQL> select job,what,interval,to_char(next_date, 'yyyy-mm-dd hh24:mi:ss ')

2 from dba_jobs where schema_user='DAIMIN';

JOB WHAT INTERVAL TO_CHAR(NEXT_DATE,'YYYY-MM-DDH

---------- -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ------------------------------

241 MYPROC; sysdate+(1/1440)*5 2008-12-16 10:10:03

查看正在运行的JOB

SQL> select * from dba_jobs_running;

SID JOB FAILURES LAST_DATE LAST_SEC THIS_DATE THIS_SEC INSTANCE

---------- ---------- ---------- ----------- ---------------- ----------- ---------------- ----------

1619 241 2008-12-16 10:25:51 0

查看daimin用户的活动会话

SQL> select sid,serial#,username,program,machine,status

2 from v$session

3 where username='DAIMIN'

4 AND STATUS='ACTIVE';

SID SERIAL# USERNAME PROGRAM MACHINE STATUS

---------- ---------- ------------------------------ ------------------------------------------------ ---------------------------------------------------------------- --------

1619 2360 DAIMIN plsqldev.exe STAPLES/DELLF98P-10QC ACTIVE

--以sys用户下来删除daimin用户，会报下面的错误

SQL> drop user daimin cascade;

drop user daimin cascade

ORA-01940: cannot drop a user that is currently connected

试图删除job

SQL> begin

2 FOR r_job IN (select job,what,interval,to_char(next_date, 'yyyy-mm-dd hh24:mi:ss ')

3 from dba_jobs where schema_user='DAIMIN'

4 ) LOOP

5 dbms_job.REMOVE(r_job.job);

6 end loop;

7 commit;

8 end;

9 /

begin

FOR r_job IN (select job,what,interval,to_char(next_date, 'yyyy-mm-dd hh24:mi:ss ')

from dba_jobs where schema_user='DAIMIN'

) LOOP

dbms_job.REMOVE(r_job.job);

end loop;

commit;

end;

ORA-23421: job number 241 is not a job in the job queue

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86

ORA-06512: at "SYS.DBMS_IJOB", line 529

ORA-06512: at "SYS.DBMS_JOB", line 171

ORA-06512: at line 5

分析错误：因为以sys用户来删除daimin用户下的JOB，所以会报错

解决方法：

1、杀掉执行JOB任务的会话进程；

alter system disconnect session 'sid,serial#' immediate;

或者Alter system kill session 'sid,serial#';

2、通过设置在初始文件中设置初始参数JOB_QUEUE_PROCESSES=0来使Oracle会杀掉CJQ0及相应job进程；

修改init.ora文件，然后重新启动数据库,或者执行ALTER SYSTEM SET JOB_QUEUE_PROCESSES = 0；

修改过初始参数 设置JOB_QUEUE_PROCESSES=0之后，重新启动数据库之后，进行逻辑备份的导入操作，先删除用户，此时删除成功！！

参考网页：
http://www.linux-cn.com/html/database/Oracle/20070423/9927.html http://www.itpub.net/thread-271792-1-1.html http://hi.baidu.com/oracle_10g/blog/item/0137c1bf1acbe10919d81fd9.html http://www.ixdba.net/article/59/1826.html