修改Memory_max_target为0出错

SQL> connect / as sysdba
Connected.
SQL> alter system set memory_target=0;

System altered.
SQL> alter system set memory_max_target=0;
alter system set memory_max_target=0
                *
ERROR at line 1:
ORA-02095: specified initialization parameter cannot bemodified

SQL> alter system set memory_max_target=0scope=spfile; --

System altered.

SQL> alter system set sga_target=6Gscope=spfile;

System altered.

SQL> alter system setpga_aggregate_target=2112M;

System altered.

SQL> alter system set shared_pool_size=0;

System altered.

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup
ORA-00843: Parameter not taking MEMORY_MAX_TARGET intoaccount
ORA-00849: SGA_TARGET 6442450944 cannot be set to more thanMEMORY_MAX_TARGET 0.
SQL> startup nomount
ORA-00843: Parameter not taking MEMORY_MAX_TARGET intoaccount
ORA-00849: SGA_TARGET 6442450944 cannot be set to more thanMEMORY_MAX_TARGET 0.

 

解决方法：

 

 

Symptoms

When trying to set SGA_TARGET using an ALTER SYSTEM command, thefollowing errors are raised:

ORA-00843: Parameter not taking MEMORY_MAX_TARGET intoaccount
ORA-00849: SGA_TARGET 10737418240 cannot be set to more thanMEMORY_MAX_TARGET 0.

 

Changes

MEMORY_MAX_TARGET was set to 0.

Cause

The problem is caused by the MEMORY_MAX_TARGET parameterexplicitly being set to 0. In case AMM should not be used,MEMORY_MAX_TARGET should not be set at all.

Solution

The solutions to the problem are:

1. create a PFILE from the SPFILE being used and remove theMEMORY_MAX_TARGET=0 and MEMORY_TARGET=0 lines. After that, use themodified PFILE to create a new SPFILE and start the instance withthis new setup.
2. should the instance be running, then use the following commandsto remove the explicit setting of MEMORY_TARGET=0 andMEMORY_MAX_TARGET=0:
   
   
   altersystem reset memory_target;
alter system reset memory_max_target;