How to fix the error ORA-00383: DEFAULT cache for blocksize string cannot be reduced to zero?

In this post, you’ll learn more about the Oracle ErrorORA-00383: DEFAULT cache for blocksize string cannot be reduced to zero with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-00383: DEFAULT cache for blocksize string cannot be reduced to zero

Reason for the Error ORA-00383: DEFAULT cache for blocksize string cannot be reduced to zero

User attempted to reduce db_cache_size to zero, or attempted to to reduce db_K_cache_size to zero while there were still online tablespaces with blocksize K. Note that since the SYSTEM tablespace cannot be taken offline, it is always illegal to set db_cache_size to zero.