Thank you, Nenad. Please see the output from ASHTOP. The highlighted lines are
Qnnn processes.
@ashtop session_id,username,sql_id,in_parse,sql_opname,top_level_call_name
session_type='BACKGROUND' sysdate-2/24 sysdate
Total
Distinct Distinct
Seconds AAS %This SESSION_ID USERNAME SQL_ID I SQL_OPNAME
TOP_LEVEL_CALL_NAME FIRST_SEEN LAST_SEEN
Execs Seen Tstamps
--------- ------- ------- ---------- --------------- ------------- -
-------------------- ------------------------------ -------------------
------------------- ---------- --------
7103 1.0 54% | 28 SYS N
VERSION2 2021-07-14 07:36:23 2021-07-14
09:36:22 1 7103
5820 .8 44% | 607 SYS N
VERSION2 2021-07-14 07:36:23 2021-07-14
09:36:22 1 5820
91 .0 1% | 1066 SYS N
LOGOFF 2021-07-14 07:36:57 2021-07-14
09:35:56 1 91
78 .0 1% | 452 SYS N
2021-07-14 07:41:21 2021-07-14
09:35:06 1 78
33 .0 0% | 451 SYS N
2021-07-14 07:36:35 2021-07-14
09:35:00 1 33
28 .0 0% | 1 SYS N
2021-07-14 07:41:49 2021-07-14
09:32:59 1 28
20 .0 0% | 602 SYS N
2021-07-14 08:02:00 2021-07-14
09:30:53 1 20
11 .0 0% | 302 SYS N
2021-07-14 07:38:57 2021-07-14
09:28:37 1 11
6 .0 0% | 157 SYS N
VERSION2 2021-07-14 07:37:57 2021-07-14
09:35:00 1 6
5 .0 0% | 1052 SYS N
2021-07-14 07:49:10 2021-07-14
09:28:45 1 5
4 .0 0% | 301 SYS N
2021-07-14 07:58:03 2021-07-14
09:26:02 1 4
2 .0 0% | 21 SYS bunssq950snhf N INSERT
VERSION2 2021-07-14 09:00:33 2021-07-14
09:00:34 1 2
2 .0 0% | 903 SYS N
2021-07-14 07:50:09 2021-07-14
08:27:55 1 2
2 .0 0% | 1053 SYS N
VERSION2 2021-07-14 08:06:16 2021-07-14
08:42:26 1 2
1 .0 0% | 7 SYS N
VERSION2 2021-07-14 07:52:24 2021-07-14
07:52:24 1 1
15 rows selected.
I will try to get pstack of the above two processes. I don't have access to the
oracle account, I will have to ask someone to do it for me.
Thank you!
From: Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
Sent: Wednesday, July 14, 2021 1:36 AM
To: Hameed, Amir <amir.hameed@xxxxxxxxxxxxxxx>; oracle-l@xxxxxxxxxxxxx
Subject: RE: [EXTERNAL] RE: AQ process waiting on "library cache: mutex X"
Hi Hameed,
Actually AQ waiters were at least partly blocked by AQ processes spinning on
CPUs:
1% 40 0 1 -> SYS:(Qnnn) library cache: mutex X ->
SYS:(Qnnn) ON CPU
2021-07-13 10:14:02 2021-07-13 11:11:55
Any AQ processes are spending much more time on CPU anyway, so I would focus on
them.
Could you include the following columns in ashtop output:
in_parse,sql_opname,top_level_call_name,sql_id ?
Could you take a couple of "pstack PID" ?
How many AQs are spinning on CPU?
You can use the following filter condition for AQ processes "program2 like
'%Qnn%'"
Best regards,
Nenad
From: Hameed, Amir
<amir.hameed@xxxxxxxxxxxxxxx<mailto:amir.hameed@xxxxxxxxxxxxxxx>>
Sent: Dienstag, 13. Juli 2021 18:19
To: Noveljic Nenad
<nenad.noveljic@xxxxxxxxxxxx<mailto:nenad.noveljic@xxxxxxxxxxxx>>;
oracle-l@xxxxxxxxxxxxx<mailto:oracle-l@xxxxxxxxxxxxx>
Subject: RE: [EXTERNAL] RE: AQ process waiting on "library cache: mutex X"
Thanks Nenad. In my case, the USERNAME is NULL, and therefore, I used the
following syntax. However, the output doesn't show any blocker unless I am
reading it incorrectly.
@/tmp/ash_wait_chains.sql username||':'||program2||event2
session_type='BACKGROUND' sysdate-1/24 sysdate
%This SECONDS AAS #Blkrs WAIT_CHAIN
FIRST_SEEN
LAST_SEEN
------ ---------- ---------- ------
--------------------------------------------------------------------------------------------------------------
------------------- -------------------
90% 6071 1.7 4 -> SYS:(Qnnn) ON CPU
2021-07-13
10:13:37 2021-07-13 11:13:35
4% 271 .1 3 -> SYS:(Qnnn) library cache: mutex X
2021-07-13
10:13:36 2021-07-13 11:13:32
3% 221 .1 1 -> SYS:(LGWR) log file parallel write
2021-07-13
10:16:05 2021-07-13 11:13:24
1% 53 0 2 -> SYS:(Mnnn) ON CPU
2021-07-13
10:13:47 2021-07-13 11:13:28
1% 40 0 1 -> SYS:(Qnnn) library cache: mutex X ->
SYS:(Qnnn) ON CPU
2021-07-13 10:14:02 2021-07-13 11:11:55
0% 23 0 1 -> SYS:(DIAn) ON CPU
2021-07-13
10:16:10 2021-07-13 11:11:57
0% 18 0 1 -> SYS:(DBWn) db file parallel write
2021-07-13
10:16:14 2021-07-13 11:12:17
0% 13 0 1 -> SYS:(LGWR) ON CPU
2021-07-13
10:19:02 2021-07-13 11:12:32
0% 9 0 1 -> SYS:(PSPn) ON CPU
2021-07-13
10:20:06 2021-07-13 11:12:26
0% 7 0 1 -> SYS:(DBWn) ON CPU
2021-07-13
10:16:02 2021-07-13 11:12:23
0% 6 0 1 -> SYS:(CKPT) control file parallel write
2021-07-13
10:23:02 2021-07-13 11:00:56
0% 5 0 5 -> SYS:(Mnnn) Disk file operations I/O
2021-07-13
10:31:16 2021-07-13 11:11:19
0% 4 0 1 -> SYS:(CKPT) control file sequential read
2021-07-13
10:22:56 2021-07-13 10:32:46
0% 4 0 1 -> SYS:(CJQn) os thread startup
2021-07-13
10:20:00 2021-07-13 11:12:26
0% 4 0 2 -> SYS:(Qnnn) Streams AQ: deallocate
messages from Streams Pool
2021-07-13 10:16:39 2021-07-13 11:04:56
0% 3 0 1 -> SYS:(DBWn) db file async I/O submit
2021-07-13
10:16:05 2021-07-13 10:57:48
0% 2 0 1 -> SYS:(Mnnn) db file sequential read
2021-07-13
11:00:27 2021-07-13 11:00:28
0% 2 0 1 -> SYS:(CJQn) ON CPU
2021-07-13
10:41:01 2021-07-13 11:05:37
0% 2 0 1 -> SYS:(DBRM) ON CPU
2021-07-13
10:46:10 2021-07-13 11:10:00
0% 2 0 1 -> SYS:(SMON) ON CPU
2021-07-13
10:22:39 2021-07-13 10:32:02
0% 2 0 1 -> SYS:(LGWR) LGWR wait for redo copy ->
APPS:(JDBC Thin Client) ON CPU 2021-07-13
10:27:09 2021-07-13 10:27:12
0% 1 0 1 -> SYS:(MMON) ON CPU
2021-07-13
10:17:21 2021-07-13 10:17:21
0% 1 0 1 -> SYS:(Mnnn) direct path write
2021-07-13
11:00:26 2021-07-13 11:00:26
0% 1 0 1 -> SYS:(Qnnn) db file sequential read
2021-07-13
10:29:15 2021-07-13 10:29:15
0% 1 0 1 -> SYS:(Mnnn) control file sequential read
2021-07-13
11:00:25 2021-07-13 11:00:25
0% 1 0 1 -> SYS:(QMNC) ON CPU
2021-07-13
11:08:45 2021-07-13 11:08:45
0% 1 0 1 -> SYS:(LGWR) LGWR wait for redo copy ->
APPS:(frmweb) ON CPU 2021-07-13
10:32:02 2021-07-13 10:32:02
0% 1 0 1 -> SYS:(CKPT) ON CPU
2021-07-13
11:00:53 2021-07-13 11:00:53
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