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在执行DDL语句时无法执行，报错ORA 00604 ORA 00942，通过隐含参数来解决同义词问题

在最近的一个客户案例中,因为缺少dual同义词,导致ddl语句无法执行。这里_system_trig_enabled参数和upgrade模式两种来解决该问题,整体上来说_system_trig_enabled不用重启数据库终止业务,更加人性化.

1.Oracle缺少dual同义词现场

SQL> create table t_xifenfei_dual as

2 select * from dba_objects;

select * from dba_objects

*

ERROR at line 2:

ORA-00604: error occurred at recursive SQL level 1

ORA-00942: table or view does not exist

SQL> alter session set events '942 trace name errorstack level 3';

Session altered.

SQL> create table t_xifenfei_dual as select * from dba_objects;

create table t_xifenfei_dual as select * from dba_objects

*

ERROR at line 1:

ORA-00604: error occurred at recursive SQL level 1

ORA-00942: table or view does not exist

--trace文件

*** 2012-09-29 12:37:05.156

ksedmp: internal or fatal error

ORA-00942: table or view does not exist

Current SQL statement for this session:

select dummy from dual where ora_dict_obj_type = 'SYNONYM'

AND ora_dict_obj_owner = 'PUBLIC'

--dual 对象

SQL> select object_type,owner from dba_objects where object_name='DUAL';

OBJECT_TYPE OWNER

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

TABLE SYS

2.尝试重建同义词

SQL> create public synonym dual for dual;

create public synonym dual for dual

*

ERROR at line 1:

ORA-00604: error occurred at recursive SQL level 1

ORA-00942: table or view does not exist

_system_trig_enabled参数

SQL> select a.ksppinm name,b.ksppstvl value,a.ksppdesc description

2 from x$ksppi a,x$ksppcv b

3 where a.inst_id = USERENV ('Instance')

4 and b.inst_id = USERENV ('Instance')

5 and a.indx = b.indx

6 and upper(a.ksppinm) LIKE upper('%¶m%')

7 order by name

8 /

Enter value for param: SYSTEM_TRIG_ENABLED

old 6: and upper(a.ksppinm) LIKE upper('%¶m%')

new 6: and upper(a.ksppinm) LIKE upper('%SYSTEM_TRIG_ENABLED%')

NAME VALUE DESCRIPTION

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

_system_trig_enabled TRUE are system triggers enabled

3.设置_SYSTEM_TRIG_ENABLED重建dual同义词

SQL> ALTER SYSTEM SET "_SYSTEM_TRIG_ENABLED"=FALSE SCOPE=MEMORY;

System altered.

SQL> create public synonym dual for dual;

Synonym created.

SQL> ALTER SYSTEM SET "_SYSTEM_TRIG_ENABLED"=true SCOPE=MEMORY;

System altered.

4.使用upgrade模式创建

SQL> drop PUBLIC SYNONYM dual;

Synonym dropped.

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area 318767104 bytes

Fixed Size 1267236 bytes

Variable Size 109054428 bytes

Database Buffers 201326592 bytes

Redo Buffers 7118848 bytes

Database mounted.

Database opened.

SQL> create public synonym dual for dual;

create public synonym dual for dual

*

ERROR at line 1:

ORA-00604: error occurred at recursive SQL level 1

ORA-00942: table or view does not exist

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup upgrage;

SP2-0714: invalid combination of STARTUP options

SQL> startup upgrape;

SP2-0714: invalid combination of STARTUP options

SQL> startup upgrade

ORACLE instance started.

Total System Global Area 318767104 bytes

Fixed Size 1267236 bytes

Variable Size 109054428 bytes

Database Buffers 201326592 bytes

Redo Buffers 7118848 bytes

Database mounted.

Database opened.

SQL> create public synonym dual for dual;

Synonym created.

SQL> startup force

ORACLE instance started.

Total System Global Area 318767104 bytes

Fixed Size 1267236 bytes

Variable Size 109054428 bytes

Database Buffers 201326592 bytes

Redo Buffers 7118848 bytes

Database mounted.

Database opened.

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