V$SERVICE_STATS definition in Oracle Database 11.2
V$SERVICE_STATS
select
SERVICE_NAME_HASH, -- SERVICE_NAME_HASH NUMBER
SERVICE_NAME, -- SERVICE_NAME VARCHAR2(64)
STAT_ID, -- STAT_ID NUMBER
STAT_NAME, -- STAT_NAME VARCHAR2(64)
VALUE -- VALUE NUMBER
from
GV$SERVICE_STATS
where
inst_id = USERENV('Instance')