How to increase the retention of the historical views in grid control

COL PARAMETER_NAME FORMAT A32
COL PARAMETER_VALUE FORMAT A100
SELECT PARAMETER_NAME, PARAMETER_VALUE, INTERNAL_FLAG FROM SYSMAN.MGMT_PARAMETERS
/

COL PARAMETER_NAME FORMAT A32
COL PARAMETER_VALUE FORMAT A55
COL PARAMETER_COMMENT FORMAT A180
SELECT PARAMETER_NAME, PARAMETER_VALUE, PARAMETER_COMMENT FROM SYSMAN.MGMT_PARAMETERS
/