All Oracle Error CodesOracle DBA Forum

ORA-00820:

Specified value of sga_max_size is too small, needs to be at least stringM
Cause: The specified value of sga_max_size is too small for the SGA to accommodate all of the necessary SGA components such as the log buffer, buffer pools, shared pool, etc.
Action: Set sga_max_size to the recommended value or reduce the values of any SGA component size parameters you have specified.