**To describe dimension keys**
This example requests the names of all wait events. The data is summarized by event name, and the aggregate values of those events over the specified time period.
Command::
aws pi describe-dimension-keys --service-type RDS --identifier db-LKCGOBK26374TPTDFXOIWVCPPM --start-time 1527026400 --end-time 1527080400 --metric db.load.avg --group-by '{"Group":"db.wait_event"}'
Output::
{
"AlignedEndTime": 1.5270804E9,
"AlignedStartTime": 1.5270264E9,
"Keys": [
{
"Dimensions": {"db.wait_event.name": "wait/synch/mutex/innodb/aurora_lock_thread_slot_futex"},
"Total": 0.05906906851195666
},
{
"Dimensions": {"db.wait_event.name": "wait/io/aurora_redo_log_flush"},
"Total": 0.015824722186149193
},
{
"Dimensions": {"db.wait_event.name": "CPU"},
"Total": 0.008014396230265477
},
{
"Dimensions": {"db.wait_event.name": "wait/io/aurora_respond_to_client"},
"Total": 0.0036361612526204477
},
{
"Dimensions": {"db.wait_event.name": "wait/io/table/sql/handler"},
"Total": 0.0019108398419382965
},
{
"Dimensions": {"db.wait_event.name": "wait/synch/cond/mysys/my_thread_var::suspend"},
"Total": 8.533847837782684E-4
},
{
"Dimensions": {"db.wait_event.name": "wait/io/file/csv/data"},
"Total": 6.864181956477376E-4
},
{
"Dimensions": {"db.wait_event.name": "Unknown"},
"Total": 3.895887056379051E-4
},
{
"Dimensions": {"db.wait_event.name": "wait/synch/mutex/sql/FILE_AS_TABLE::LOCK_shim_lists"},
"Total": 3.710368625122906E-5
},
{
"Dimensions": {"db.wait_event.name": "wait/lock/table/sql/handler"},
"Total": 0
}
]
}