SELECT
begin_time, -- BEGIN_TIME DATE
end_time, -- END_TIME DATE
intsize_csec, -- INTSIZE_CSEC NUMBER
group_id, -- GROUP_ID NUMBER
metric_id, -- METRIC_ID NUMBER
metric_name, -- METRIC_NAME VARCHAR2(64)
value, -- VALUE NUMBER
metric_unit -- METRIC_UNIT VARCHAR2(64)
FROM
gv$sysmetric_history
WHERE
inst_id = USERENV('INSTANCE')