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11.50.FC9W3:Long checkpoint due to 2 sessions in c

Posted By: JAN DUDA
Date: Friday, 29 July 2016, at 5:51 a.m.

Hello,
I have problem which appears sporadically (~10 times this year) on some systems which our customers installs. Affected Informix is 11.50.FC9W3, SLES11 SP4.
Behaviour is always same. Informix remains blocked in "CKPT REQ" state for long time (~4-12 hours) and is not accessible e.g. over dbaccess. I checked that checkpoint is waiting until some sessions leave critical section. What is strange is that both sessions are in critical section for read/write on same table (h_port) at same time. How it is possible? h_port table is locked with HDR+X by session 72802 which do delete from table. I cannot certainly identify which session entered critical section first, but I think from my observation that it is session 19340. If Linux process related to session 19340 is stopped, database immediatelly continue and finish checkpoint. oncheck output is fine for complete database.
How can I continue with analysis? Thank you in advance.
I can provide complete onstat -a output if anybody is interested in.
onstat -
IBM Informix Dynamic Server Version 11.50.FC9W3 -- On-Line (CKPT REQ) -- Up 5 days 00:25:17 -- 5213048 Kbytes
Blocked:CKPT
hipath-man:/var/informix # onstat -u
Userthreads
address flags sessid user tty wait tout locks nreads nwrites
...
163390220 ---PX-- 72802 sad - 0 0 2 0 640
163390a78 ---PR-- 19340 sad - 0 0 1 0 0
...
hipath-man:/var/informix # onstat -g ses 72802
IBM Informix Dynamic Server Version 11.50.FC9W3 -- On-Line (CKPT REQ) -- Up 5 days 00:27:07 -- 5213048 Kbytes
Blocked:CKPT
session effective #RSAM total used dynamic
id user user tty pid hostname threads memory memory explain
72802 sad - - 18649 hipath-m 1 212992 206752 off
Program :
/opt/cm/sad/bin/uxsdbsyn
tid name rstcb flags curstk status
73146 sqlexec 163390220 ---PX-- 11392 IO Wait-
Memory pools count 2
name class addr totalsize freesize #allocfrag #freefrag
72802 V 16772b040 208896 5432 353 4
72802*O0 V 164db4040 4096 808 1 1
name free used name free used
overhead 0 6576 scb 0 144
opentable 0 13344 filetable 0 3648
ru 0 600 log 0 16536
temprec 0 11424 keys 0 240
ralloc 0 98200 gentcb 0 1584
ostcb 0 2920 sqscb 0 26280
sql 0 72 rdahead 0 1120
hashfiletab 0 552 osenv 0 3040
sqtcb 0 9792 fragman 0 8896
udr 0 1784
sqscb info
scb sqscb optofc pdqpriority optcompind directives
16622c050 165381028 0 0 1 1
Sess SQL Current Iso Lock SQL ISAM F.E.
Id Stmt type Database Lvl Mode ERR ERR Vers Explain
72802 DELETE cdb NL Not Wait 0 0 9.37 Off
Current SQL statement (2096) :
delete from h_port where switch_name = ? and issue = ? and extension = ?;
Host variables :
address type flags value
-----------------------------------------
0x0000000165e47b60 CHAR 0x000 A002
0x0000000165e47bf0 CHAR 0x000 C
0x0000000165e47c80 CHAR 0x000 2286
Last parsed SQL statement :
delete from h_port where switch_name = ? and issue = ? and extension = ?;
2072 byte(s) of memory is allocated from the sscpool
hipath-man:/var/informix # onstat -g ses 19340
IBM Informix Dynamic Server Version 11.50.FC9W3 -- On-Line (CKPT REQ) -- Up 5 days 00:27:46 -- 5213048 Kbytes
Blocked:CKPT
session effective #RSAM total used dynamic
id user user tty pid hostname threads memory memory explain
19340 sad - - 18283 hipath-m 1 184320 161888 off
Program :
/opt/cm/sad/bin/umproxy
tid name rstcb flags curstk status
19560 sqlexec 163390a78 ---PR-- 5568 running-
Memory pools count 2
name class addr totalsize freesize #allocfrag #freefrag
19340 V 167af5040 180224 21624 272 9
19340*O0 V 165748040 4096 808 1 1
name free used name free used
overhead 0 6576 scb 0 144
opentable 0 5064 filetable 0 1200
log 0 16536 temprec 0 13472
keys 0 1080 ralloc 0 66832
gentcb 0 1584 ostcb 0 2920
sort 0 104 sqscb 0 28000
sql 0 72 rdahead 0 1120
hashfiletab 0 552 osenv 0 3040
sqtcb 0 9304 fragman 0 4152
sapi 0 64
sqscb info
scb sqscb optofc pdqpriority optcompind directives
1658110c0 165e24028 0 0 1 1
Sess SQL Current Iso Lock SQL ISAM F.E.
Id Stmt type Database Lvl Mode ERR ERR Vers Explain
19340 SELECT cdb NL Not Wait 0 0 9.37 Off
Current statement name : curs
Current SQL statement (51815) :
select um_operation_id from h_port where switch_name = "A002" and
extension = "2286" and active = "A"
Last parsed SQL statement :
select um_operation_id from h_port where switch_name = "A002" and
extension = "2286" and active = "A"
Locks
address wtlist owner lklist type tblsnum rowid key#/bsiz
478e4010 0 1633895a8 4835b410 HDR+X 1000f2 302 0
478e4090 0 163396640 4835ae10 HDR+IX 20015b 0 0
478e4110 0 16338aeb0 0 S 100002 207 0
478e4b90 0 163392bd8 0 S 100002 207 0
47c60d90 0 1633884f8 0 S 100002 206 0
47c60f10 0 16339a900 0 S 100002 207 0
47c60f90 0 163396e98 0 S 100002 207 0
47c61090 0 16339f418 47fdde90 HDR+IX 2000d0 0 0
47c61110 0 16339e368 0 S 100002 207 0
47c61810 0 163390220 47fdde10 HDR+X 2001b9 0 0
47fddb10 0 163388d50 0 S 100002 206 0
47fddb90 0 163393430 0 S 100002 207 0
47fddc10 0 16338c7b8 0 S 100002 207 0
47fdde10 0 163390220 0 S 100002 207 0
47fdde90 0 16339f418 0 S 100002 207 0
47fde310 0 16338f9c8 0 HDR+S 100002 201 0
47fde410 0 16338e0c0 0 S 100002 207 0
47fde990 0 16339b158 0 S 100002 207 0
47fdf710 0 16339db10 0 S 100002 207 0
4835a890 0 1633895a8 0 HDR+S 100002 206 0
4835a990 0 16339b9b0 0 S 100002 207 0
4835aa10 0 16338d010 0 S 100002 207 0
4835aa90 0 163390a78 0 S 100002 207 0
4835ad90 0 1633944e0 0 S 100002 207 0
4835ae10 0 163396640 0 S 100002 207 0
4835af90 0 163392380 0 HDR+S 100002 207 0
4835b410 0 1633895a8 4835a890 HDR+IX 1000f2 0 0
4835b490 0 16338d010 4835aa10 HDR+IX 2000c7 0 0
4835b510 0 16338d010 4835b490 HDR+X 2000c7 100 0
4835b690 0 16339f418 47c61090 HDR+X 2000d0 300 0
486d7710 0 163394d38 0 S 100002 207 0
486d7910 0 1633912d0 0 S 100002 207 0
486d7b90 0 16339fc70 0 S 100002 207 0
486d7c10 0 1633987a0 0 S 100002 207 0
486d7e90 0 1633a36d8 0 S 100002 207 0
486d8290 0 16338d868 0 S 100002 207 0
48a54390 0 163393c88 0 S 100002 207 0
48a54410 0 1633a04c8 0 S 100002 207 0
48a54510 0 163398ff8 0 S 100002 207 0
48a54910 0 163395590 0 S 100002 207 0
48a55090 0 16339ca60 0 S 100002 207 0
48dd1310 0 163399850 0 S 100002 207 0
48dd1490 0 16338f170 0 S 100002 207 0
48dd1590 0 16338e918 0 S 100002 207 0
44 active, 200000 total, 65536 hash buckets, 0 lock table overflows

Messages In This Thread

11.50.FC9W3:Long checkpoint due to 2 sessions in c
JAN DUDA -- Friday, 29 July 2016, at 5:51 a.m.
- Re: 11.50.FC9W3:Long checkpoint due to 2 sessions
  BENJAMIN THOMPSON -- Wednesday, 17 August 2016, at 11:11 a.m.
- Re: 11.50.FC9W3:Long checkpoint due to 2 sessions
  MARK SCRANTON -- Monday, 22 August 2016, at 6:49 p.m.

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