Sorry, *DBA_HIST_FILEMETRIC_HISTORY* has also been returned *0* line, Kyle!
I called DBMS_METADATA.GET_DDL() to check the view defined.
SET VERIFY OFF
SET LONG 1000000000
SET LINESIZE 200
SET PAGESIZE 200
PROMPT =======================
PROMPT Running on SYS schema
PROMPT =======================
SELECT DBMS_METADATA.get_ddl(UPPER('&object_type'), UPPER('&object_name'),
UPPER('&owner_name')) FROM dual
/
Enter value for object_type: view
Enter value for object_name: *dba_hist_waitclassmet_history*
Enter value for owner_name: sys
DBMS_METADATA.GET_DDL(UPPER('VIEW'),UPPER('DBA_HIST_WAITCLASSMET_HISTORY'),UPPER
--------------------------------------------------------------------------------
DBMS_METADATA.GET_DDL(UPPER('VIEW'),UPPER('DBA_HIST_WAITCLASSMET_HISTORY'),UPPER
--------------------------------------------------------------------------------
CREATE OR REPLACE FORCE VIEW "SYS"."DBA_HIST_WAITCLASSMET_HISTORY"
("SNAP_ID", "DBID", "INSTANCE_NUMBER", "WAIT_CLASS
_ID", "WAIT_CLASS", "BEGIN_TIME", "END_TIME", "INTSIZE", "GROUP_ID",
"AVERAGE_WA
ITER_COUNT", "DBTIME_IN_WAIT", "TIME_WAITED", "WAIT_COUNT",
"TIME_WAITED_FG", "W
AIT_COUNT_FG") AS
select em.snap_id, em.dbid, em.instance_number,
em.wait_class_id, wn.wait_class, begin_time, end_time, intsize,
group_id, average_waiter_count, dbtime_in_wait,
time_waited, wait_count, time_waited_fg, wait_count_fg
from wrm$_snapshot sn, *WRH$_WAITCLASSMETRIC_HISTORY* em,
(select wait_class_id, wait_class from wrh$_event_name
group by wait_class_id, wait_class) wn
where em.wait_class_id = wn.wait_class_id
and sn.snap_id = em.snap_id
and sn.dbid = em.dbid
and sn.instance_number = em.instance_number
and sn.status = 0
COUNT(*)
----------
0
SET LONG 1000000000
SET LINESIZE 200
SET PAGESIZE 200
PROMPT =======================
PROMPT Running on SYS schema
PROMPT =======================
SELECT DBMS_METADATA.get_ddl(UPPER('&object_type'), UPPER('&object_name'),
UPPER('&owner_name')) FROM dual
/
Enter value for object_type: view
Enter value for object_name: *dba_hist_filemetric_history*
Enter value for owner_name: sys
DBMS_METADATA.GET_DDL(UPPER('VIEW'),UPPER('DBA_HIST_FILEMETRIC_HISTORY'),UPPER('
--------------------------------------------------------------------------------
CREATE OR REPLACE FORCE VIEW "SYS"."DBA_HIST_FILEMETRIC_HISTORY"
("SNAP_ID", "DBID", "INSTANCE_NUMBER", "FILEID", "CR
EATIONTIME", "BEGIN_TIME", "END_TIME", "INTSIZE", "GROUP_ID",
"AVGREADTIME", "AV
GWRITETIME", "PHYSICALREAD", "PHYSICALWRITE", "PHYBLKREAD", "PHYBLKWRITE")
AS
select fm.snap_id, fm.dbid, fm.instance_number,
fileid, creationtime, begin_time,
end_time, intsize, group_id, avgreadtime, avgwritetime,
physicalread, physicalwrite, phyblkread, phyblkwrite
from wrm$_snapshot sn, *WRH$_FILEMETRIC_HISTORY* fm
where sn.snap_id = fm.snap_id
and sn.dbid = fm.dbid
and sn.instance_number = fm.instance_number
and sn.status = 0
COUNT(*)
----------
0
Thanks for exploring those views you mentioned previously, Kyle 😊.
But they're not empty data for those views marking ALERT by you. Maybe
really breached some limit (it doesn't seem like to exceed how much lines).
Best Regards
Quanwen Zhao
在 2021年12月3日星期五，kyle Hailey <kylelf@xxxxxxxxx> 写道：
when some limit has been breached.
Yeah, I recall empty dba_hist_waitclassmet_history being confusing.
I believe dba_hist_waitclassmet_history is just for alerting entries
It's been a long time since I've looked at this stuff.wrote:
Statistics
DBA_HIST_SYSMETRIC_SUMMARY – max, min, avg standard deviation
DBA_HIST_SYSSTAT (cumulative)
DBA_HIST_SYSMETRIC_HISTORY (alerts)
Waits
WAITCLASSMETRIC_HISTORY (alerts)
DBA_HIST_SYSTEM_EVENT (cumulative)
File IO
DBA_HIST_FILEMETRIC_HISTORY (alerts)
DBA_HIST_FILESTATXS (cumulative)
On Sun, Nov 28, 2021 at 12:49 AM Quanwen Zhao <quanwenzhao@xxxxxxxxx>
"v$waitclassmetric_history", and "dba_hist_waitclassmet_history". Here're
Hello Listeners 😊,
Recently I've found three important views about "v$waitclassmetric",
the corresponding links from oracle online docs:
https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/V-WAITCLASSMETRIC.html
https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/V-WAITCLASSMETRIC_HISTORY.html#GUID-854BB495-19FC-4EB4-A81C-4D0EEA13B83C
https://docs.oracle.com/en/database/oracle/oracle-database/19/refrn/DBA_HIST_WAITCLASSMET_HISTORY.html#GUID-A931DFBF-4023-41F0-A333-E56741DE589D
recent 60-second interval. A history of the last one hour will be kept in
Quoted the brief introduction for themselves:
9.131 V$WAITCLASSMETRIC
V$WAITCLASSMETRIC displays metric values of wait classes for the most
the system.
all intervals in the last one hour.
9.132 V$WAITCLASSMETRIC_HISTORY
V$WAITCLASSMETRIC_HISTORY displays metric values of wait classes for
for V$WAITCLASSMETRIC.
The columns for V$WAITCLASSMETRIC_HISTORY are the same as those
class metric data kept by the Workload Repository.
5.84 DBA_HIST_WAITCLASSMET_HISTORY
DBA_HIST_WAITCLASSMET_HISTORY displays the history of the wait event
oracle 21.3 (test db) and found all the same situation from 19.3 and
But why dba_hist_waitclassmet_history has 0 line? Here's my query from
11.2.0.4:
dba_hist_waitclassmet_history;
16:43:23 SYS@ORACDB> select count(*) from v$waitclassmetric;
COUNT(*)
----------
13
16:43:29 SYS@ORACDB> select count(*) from v$waitclassmetric_history;
COUNT(*)
----------
793
16:43:33 SYS@ORACDB> select count(*) from
wait class metric to view dba_hist_waitclassmet_history or is it a bug?
COUNT(*)
----------
0
Has anybody else encountered it? Oracle hasn't saved the historical
Best Regards
Quanwen Zhao
