the workload is run now in a loop. i found lgwr waiting for "log file
parallel write" which i think is as close to I/O syscall as oracle
instrumentation get. i'm also collecting snapper ash,stats data on log
writer (started a few minutes prior to FIRST_SEEN ASH value:
SQL> @ashtop session_id,blocking_session,event2 session_id=1710
sysdate-5/60/24 sysdate
TOTALSECONDS AAS %This SESSION_ID BLOCKING_SESSION
EVENT2 FIRST_SEEN LAST_SEEN
DIST_SQLEXEC_SEEN
_______________ ______ __________ _____________ ___________________
__________________________ ______________________ ______________________
____________________
3 0 100% | 1710 log
file parallel write 2020-01-28 13:29:13 2020-01-28 13:31:42
1
SQL>
[oracle@lsst-oradb05 bin]$ egrep -E "WAIT, log file parallel write"
/u01/app/oracle/diag/rdbms/lsst2db/lsst2db2/trace/lsst2db2_ora_15677.trc
1710 @2, (LGWR) , WAIT, log file parallel write
, 1196, 93.91us, .0%, [ ], 4,
.31, 299us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 630, 50.31us, .0%, [ ], 2,
.16, 315us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 147789, 11.81ms, 1.2%, [W ], 667,
53.28, 221.57us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 49235, 3.91ms, .4%, [ ], 195,
15.49, 252.49us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 3298, 262.28us, .0%, [ ], 4,
.32, 824.5us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 2452, 209.78us, .0%, [ ], 4,
.34, 613us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 1355, 107.26us, .0%, [ ], 4,
.32, 338.75us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 19458, 1.55ms, .2%, [ ], 101,
8.03, 192.65us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 139403, 11.07ms, 1.1%, [W ], 654,
51.92, 213.15us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 24798, 1.97ms, .2%, [ ], 95,
7.56, 261.03us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 4816, 380.56us, .0%, [ ], 9,
.71, 535.11us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 566, 45.11us, .0%, [ ], 2,
.16, 283us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 1153, 91.97us, .0%, [ ], 4,
.32, 288.25us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 140698, 11.2ms, 1.1%, [W ], 677,
53.9, 207.83us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 42907, 3.4ms, .3%, [ ], 187,
14.82, 229.45us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 5166, 412.41us, .0%, [ ], 11,
.88, 469.64us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 1968, 156.09us, .0%, [ ], 3,
.24, 656us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 986, 78.64us, .0%, [ ], 3,
.24, 328.67us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 21365, 1.7ms, .2%, [ ], 106,
8.45, 201.56us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 139508, 11.07ms, 1.1%, [W ], 686,
54.43, 203.36us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 48671, 3.87ms, .4%, [ ], 263,
20.89, 185.06us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 2592, 206.18us, .0%, [ ], 5,
.4, 518.4us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 3723, 295.78us, .0%, [ ], 4,
.32, 930.75us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 1171, 93.15us, .0%, [ ], 4,
.32, 292.75us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 142015, 11.29ms, 1.1%, [W ], 663,
52.73, 214.2us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 47919, 3.82ms, .4%, [ ], 187,
14.92, 256.25us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 3892, 309.88us, .0%, [ ], 5,
.4, 778.4us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 2321, 184.91us, .0%, [ ], 4,
.32, 580.25us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 1039, 82.57us, .0%, [ ], 3,
.24, 346.33us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 56706, 4.52ms, .5%, [ ], 275,
21.94, 206.2us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 123077, 9.71ms, 1.0%, [W ], 575,
45.38, 214.05us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 1911, 151.92us, .0%, [ ], 3,
.24, 637us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 4127, 327.46us, .0%, [ ], 5,
.4, 825.4us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 1938, 154.74us, .0%, [ ], 6,
.48, 323us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 380, 30.14us, .0%, [ ], 1,
.08, 380us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 136460, 10.81ms, 1.1%, [W ], 650,
51.51, 209.94us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 51015, 4.06ms, .4%, [ ], 201,
15.98, 253.81us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 3463, 274.19us, .0%, [ ], 4,
.32, 865.75us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 3182, 251.84us, .0%, [ ], 7,
.55, 454.57us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 951, 76.06us, .0%, [ ], 3,
.24, 317us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 65434, 5.21ms, .5%, [W ], 320,
25.49, 204.48us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 85294, 6.78ms, .7%, [W ], 396,
31.46, 215.39us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 4291, 340.19us, .0%, [ ], 18,
1.43, 238.39us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 5931, 471.32us, .0%, [ ], 24,
1.91, 247.13us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 3314, 264.35us, .0%, [ ], 13,
1.04, 254.92us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 24436, 1.95ms, .2%, [ ], 90,
7.19, 271.51us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 4052, 319.83us, .0%, [ ], 6,
.47, 675.33us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 273, 21.59us, .0%, [ ], 1,
.08, 273us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 903, 71.85us, .0%, [ ], 3,
.24, 301us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 134568, 10.64ms, 1.1%, [W ], 639,
50.54, 210.59us average wait
1710 @2, (LGWR) , WAIT, log file parallel write
, 50692, 4.32ms, .4%, [ ], 208,
17.72, 243.71us average wait
On Tue, Jan 28, 2020 at 1:20 PM Chris Stephens <cstephens16@xxxxxxxxx>
wrote:
doesn't look like any ash data for lgwr:
SQL> @ashtop session_id,blocking_session,event2 1=1 "TIMESTAMP'2020-01-27
15:50:48'" "TIMESTAMP'2020-01-27 15:52:40'"
TOTALSECONDS AAS %This SESSION_ID BLOCKING_SESSION
EVENT2 FIRST_SEEN LAST_SEEN
DIST_SQLEXEC_SEEN
_______________ ______ __________ _____________ ___________________
_____________________ ______________________ ______________________
____________________
81 0.7 82% | 1713 1710 log
file sync 2020-01-27 15:50:54 2020-01-27 15:52:14
1
5 0 5% | 1221 ON CPU
2020-01-27 15:50:59 2020-01-27 15:52:14
1
3 0 3% | 246 ON CPU
2020-01-27 15:51:00 2020-01-27 15:52:00
1
3 0 3% | 1713 ON CPU
2020-01-27 15:50:51 2020-01-27 15:52:27
2
1 0 1% | 123 ON CPU
2020-01-27 15:51:35 2020-01-27 15:51:35
1
1 0 1% | 127 ON CPU
2020-01-27 15:51:50 2020-01-27 15:51:50
1
1 0 1% | 252 2321 latch
free 2020-01-27 15:52:28 2020-01-27 15:52:28
1
1 0 1% | 978 ges
remote message 2020-01-27 15:50:48 2020-01-27 15:50:48
1
1 0 1% | 983 latch
free 2020-01-27 15:52:28 2020-01-27 15:52:28
1
1 0 1% | 1713
library cache lock 2020-01-27 15:50:48 2020-01-27 15:50:48
1
1 0 1% | 1831 ON CPU
2020-01-27 15:50:49 2020-01-27 15:50:49
1
11 rows selected.
SQL> @ashtop session_id,blocking_session,event2 session_id=1710
"TIMESTAMP'2020-01-27 15:50:48'" "TIMESTAMP'2020-01-27 15:52:40'"
no rows selected
On Tue, Jan 28, 2020 at 1:09 PM Noveljic Nenad <
nenad.noveljic@xxxxxxxxxxxx> wrote:
You’re using v0.2, but v0.6 should be the latest version. 0.2 wouldn’t
show idle blockers.
I looked at the ashtop output once again. Strange that lgwr processes nor
any other bg processes show up significantly there. The question is, what
was lgwr doing while the fg processes were waiting on him.
*Von: *Chris Stephens <cstephens16@xxxxxxxxx>
*Datum *Dienstag, 28. Jan. 2020, 7:59 PM
*An: *Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
*Cc: *oracle-l <Oracle-L@xxxxxxxxxxxxx>
*Betreff: *Re: intermittent long "log file sync" waits
probably just 19c RAC
SQL> @ash_wait_chains event2 session_id=1713 "TIMESTAMP'2020-01-27
15:50:48'" "TIMESTAMP'2020-01-27 15:52:40'"
-- Display ASH Wait Chain Signatures script v0.2 BETA by Tanel Poder (
http://blog.tanelpoder.com ;)
, TO_CHAR(CASE WHEN session_state = 'WAITING' THEN p1 ELSE null
END, '0XXXXXXXXXXXXXXX') p1hex
*
ERROR at line 14:
ORA-12850: Could not allocate slaves on all specified instances: 3
needed, 1 allocated
SQL>
Session: c2
On Tue, Jan 28, 2020 at 11:30 AM Noveljic Nenad <
nenad.noveljic@xxxxxxxxxxxx> wrote:
The script should work with 19. It must be something else. Could you try
with ash_wait_chains2 - 2 is the rac version? For start, I would group only
on event2 (the first parameter).
If it doesn’t work, please post the error message.
*Von: *Chris Stephens <cstephens16@xxxxxxxxx>
*Datum *Dienstag, 28. Jan. 2020, 5:43 PM
*An: *Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
*Cc: *oracle-l <Oracle-L@xxxxxxxxxxxxx>
*Betreff: *Re: intermittent long "log file sync" waits
unfortunately, ash_wait_chains.sql doesn't work on 19.3 but here is
ashtop showing foreground process blocked on lgwr (1710):
SQL> @ashtop inst_id,username,blocking_session,blocking_inst_id,event2
1=1 "TIMESTAMP'2020-01-27 15:50:48'" "TIMESTAMP'2020-01-27 15:52:40'"
TOTALSECONDS AAS %This INST_ID USERNAME
BLOCKING_SESSION BLOCKING_INST_ID EVENT2
FIRST_SEEN LAST_SEEN DIST_SQLEXEC_SEEN
_______________ ______ __________ __________ ________________
___________________ ___________________ _____________________
______________________ ______________________ ____________________
81 0.7 82% | 2 GEN3_MGOWER_3
1710 2 log file sync 2020-01-27 15:50:54
2020-01-27 15:52:14 1
9 0.1 9% | 1 SYS
ON CPU 2020-01-27 15:50:49
2020-01-27 15:52:14 1
3 0 3% | 2 GEN3_MGOWER_3
ON CPU 2020-01-27 15:50:51
2020-01-27 15:52:27 2
2 0 2% | 2 SYS
ON CPU 2020-01-27 15:51:35
2020-01-27 15:51:40 1
1 0 1% | 2 GEN3_MGOWER_3
library cache lock 2020-01-27 15:50:48
2020-01-27 15:50:48 1
1 0 1% | 2 SYS
2321 2 latch free 2020-01-27 15:52:28
2020-01-27 15:52:28 1
1 0 1% | 2 SYS
ges remote message 2020-01-27 15:50:48
2020-01-27 15:50:48 1
1 0 1% | 2 SYS
latch free 2020-01-27 15:52:28
2020-01-27 15:52:28 1
8 rows selected.
SQL> @bg lgwr
NAME DESCRIPTION SID OPID SPID PADDR
SADDR
_______ ______________ _______ _______ ________ ___________________
___________________
LGWR Redo etc. 1710 34 26552 00000001E8718860
00000001D8BFF4A0
On Tue, Jan 28, 2020 at 10:25 AM Noveljic Nenad <
nenad.noveljic@xxxxxxxxxxxx> wrote:
Hi Chris,
log file sync measures much more than IO.
First of all, I’d run Tanel’s ash_wait_chains (
https://github.com/tanelpoder/tpt-oracle/blob/master/ash/ash_wait_chains.sql
), because if often points straightly to the root cause .
Here’s is a usage example, when intermittent log file sync waits where
caused by slow control file writes:
https://nenadnoveljic.com/blog/bad-commit-performance-control-file-writes/
.
Best regards,
Nenad
*From:* oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> *On
Behalf Of *Chris Stephens
*Sent:* Dienstag, 28. Januar 2020 17:09
*To:* oracle-l <Oracle-L@xxxxxxxxxxxxx>
*Subject:* intermittent long "log file sync" waits
3-node Oracle 19.3 RAC
Centos 7
We have a SQLAlchemy/Python based application workload that is running
the exact same steps with widely varying response times which appear to be
related to varying "log file sync" wait times.
Here is a profile of a "fast" run:
CALL-NAME DURATION % CALLS MEAN
MIN MAX
------------------------------ --------- ------ ------ --------
-------- ---------
SQL*Net message from client 53.197782 91.8% 10,092 0.005271
0.000177 28.568493
EXEC 3.759177 6.5% 9,816 0.000383
0.000000 0.239592
row cache lock 0.233153 0.4% 541 0.000431
0.000113 0.000941
PARSE 0.140399 0.2% 4,867 0.000029
0.000000 0.006620
DLM cross inst call completion 0.137330 0.2% 956 0.000144
0.000004 0.000505
library cache lock 0.100171 0.2% 215 0.000466
0.000151 0.002133
library cache pin 0.079729 0.1% 216 0.000369
0.000056 0.000710
FETCH 0.058253 0.1% 1,062 0.000055
0.000000 0.004148
log file sync 0.048217 0.1% 149 0.000324
0.000259 0.000505
CLOSE 0.045416 0.1% 4,929 0.000009
0.000000 0.000073
20 others 0.135624 0.2% 11,854 0.000011
0.000000 0.001700
------------------------------ --------- ------ ------ --------
-------- ---------
TOTAL (30) 57.935251 100.0% 44,697 0.001296
0.000000 28.568493
Here is a profile of a "slow" run:
CALL-NAME DURATION % CALLS MEAN
MIN MAX
------------------------------ ---------- ------ ------ --------
-------- ----------
SQL*Net message from client 131.186118 61.0% 10,092 0.012999
0.000212 106.789360
log file sync 79.291166 36.8% 150 0.528608
0.000264 2.986575
EXEC 3.728402 1.7% 9,816 0.000380
0.000000 0.221403
row cache lock 0.248868 0.1% 542 0.000459
0.000111 0.001036
PARSE 0.164267 0.1% 4,867 0.000034
0.000000 0.004652
DLM cross inst call completion 0.146981 0.1% 957 0.000154
0.000005 0.001188
library cache lock 0.104354 0.0% 218 0.000479
0.000160 0.000728
library cache pin 0.082504 0.0% 202 0.000408
0.000157 0.000672
FETCH 0.056687 0.0% 1,062 0.000053
0.000000 0.003969
CLOSE 0.043590 0.0% 4,929 0.000009
0.000000 0.000180
20 others 0.142044 0.1% 11,866 0.000012
0.000000 0.001792
------------------------------ ---------- ------ ------ --------
-------- ----------
TOTAL (30) 215.194981 100.0% 44,701 0.004814
0.000000 106.789360
looking at even histogram for that event:
SQL> @evh "log file sync"
EVH_EVENT EVH_WAIT_TIME_MILLI WAIT_COUNT EVH_EST_TIME
LAST_UPDATE_TIME
________________ ______________________ _____________ _______________
______________________________________
log file sync < 1 200051 100.026
27-JAN-20 11.39.57.344734 PM -06:00
log file sync < 2 165 0.248
28-JAN-20 12.18.10.429089 AM -06:00
log file sync < 4 150 0.45
27-JAN-20 11.18.31.158102 PM -06:00
log file sync < 8 199 1.194
27-JAN-20 11.19.14.209947 PM -06:00
log file sync < 16 253 3.036
28-JAN-20 08.03.17.851328 AM -06:00
log file sync < 32 472 11.328
27-JAN-20 11.20.22.746033 PM -06:00
log file sync < 64 728 34.944
28-JAN-20 01.13.37.364541 AM -06:00
log file sync < 128 691 66.336
27-JAN-20 11.31.37.400504 PM -06:00
log file sync < 256 414 79.488
28-JAN-20 12.18.10.423987 AM -06:00
log file sync < 512 405 155.52
28-JAN-20 03.27.50.540383 AM -06:00
log file sync < 1024 459 352.512
27-JAN-20 11.35.14.378363 PM -06:00
log file sync < 2048 482 740.352
28-JAN-20 01.18.20.556248 AM -06:00
log file sync < 4096 576 1769.472
27-JAN-20 11.21.05.084998 PM -06:00
log file sync < 8192 89 546.816
27-JAN-20 11.57.36.436460 AM -06:00
log file sync < 16384 60 737.28
25-JAN-20 07.48.31.460408 AM -06:00
log file sync < 32768 39 958.464
27-JAN-20 11.59.09.869286 AM -06:00
log file sync < 65536 27 1327.104
25-JAN-20 09.49.13.856563 AM -06:00
The weird thing is that I don't see corresponding log I/O waits
(awaits) in iostat output.
I have a ticket open w/ oracle but does anyone have any suggestions to
discover root cause and/or solution?
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