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 be modified
SQL> alter system set memory_max_target=0 scope=spfile; --
System altered.
SQL> alter system set sga_target=6G scope=spfile;
System altered.
SQL> alter system set pga_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 into account
ORA-00849: SGA_TARGET 6442450944 cannot be set to more than MEMORY_MAX_TARGET 0.
SQL> startup nomount
ORA-00843: Parameter not taking MEMORY_MAX_TARGET into account
ORA-00849: SGA_TARGET 6442450944 cannot be set to more than MEMORY_MAX_TARGET 0.
解决方法：
Symptoms
When trying to set SGA_TARGET using an ALTER SYSTEM command,the following errors are raised:
ORA-00843: Parameter not taking MEMORY_MAX_TARGET into account
ORA-00849: SGA_TARGET 10737418240 cannot be set to more than MEMORY_MAX_TARGET 0.
Changes
MEMORY_MAX_TARGET was set to 0.
Cause
The problem is caused by the MEMORY_MAX_TARGET parameter explicitly 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:
create a PFILE from the SPFILE being used and remove the MEMORY_MAX_TARGET=0 and MEMORY_TARGET=0 lines. After that,use the modified PFILE to create a new SPFILE and start the instance with this new setup.
should the instance be running,then use the following commands to remove the explicit setting of MEMORY_TARGET=0 and MEMORY_MAX_TARGET=0:
alter system reset memory_target;
alter system reset memory_max_target;
参考博文：https://blog.csdn.net/babymouse1212/article/details/71078799
（编辑：李大同）
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