All Oracle Error CodesOracle DBA Forum

ORA-00821:

Specified value of sga_target stringM is too small, needs to be at least stringM
Cause: The specified value of sga_target 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_target to the recommended value or reduce the values of any SGA component size parameters you have specified.