ORA-849

ORA-00843, ORA-00849 When Trying To Change SGA_TARGET With MEMORY_MAX_TARGET=0 Being Active [ID 1397761.1]

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:

1. 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.
2. 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;