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IDS Forum

Re: Session "Waiting on a transaction"

Posted By: Marcus Haarmann
Date: Thursday, 13 August 2015, at 3:58 p.m.

In Response To: Re: Session "Waiting on a transaction" (david@smooth1.co.uk)

Hi,

with XA, you might get a runaway transaction, which holds locks, but has no owner any more.
We sometimes have the same situation, which mostly occurs when a JBoss/Wildfly server
has to be killed because there is no reaction because of heap problems, or dies for some reason (JDK crash).
It then leaves open transactions, which are never closed
(at least not from the IDS server). Even bouncing the engine does not help.
To avoid such situations, we have developed a script, which stops the JBoss server from accepting new requests
and we shut down the server manually only when we are sure there is no running transaction any more.
The latest Version 9.x has a builtin option to establish a graceful shutdown, I read it in the announcement.
When you are using clustering, the availability of the Server in the cluster has to be purged, which results
in no more requests arriving. In case of no clustering, an option would be to shut down the JNDI listener, but the problem
is that you cannot stop the server without JNDI ...
We are closing the Defaultpartition, which is base for Clustering, via JMX. (at least this is working on older versions).

We have written a short java app which attaches to the runaway XA transaction and terminates it.
(rather complex, internal stuff, which is rarely used in normal programming. But it works.).
You can see those transactions normally by running onstat -x and you will see a line like:
268b0abe0 -T--G 0 20 ....
The third column tells you that this transaction has no owner any more. The fourth column is the number of locks which
the transaction is holding.

If you are interested, I can share the code.

Marcus Haarmann

----- Ursprüngliche Mail -----

Von: david@smooth1.co.uk
An: ids@iiug.org
Gesendet: Dienstag, 11. August 2015 23:55:47
Betreff: Re: Session "Waiting on a transaction" [35596]

What does onstat -x give?

Whaat does "onstat -g ses <sid>" for the session give?

Use the tid from the "onstat -g ses" what does "onstat -g stk <tid>" give?

Also

onstat -g con
onstat -g lmx
onstat -s

would be useful.

Is the server with the issue the co-ordinator or a participant in the
transaction?

Regards,
David.

> On 11 August 2015 at 22:45 Art Kagel <art.kagel@gmail.com> wrote:
>
>
> Have you tried this with native Informix two phase commit transactions (ie
> no XA)? XA transactions carry a lot of overhead.
>
> Art
>
> Art S. Kagel, President and Principal Consultant
> ASK Database Management
> www.askdbmgt.com
>
> Blog: http://informix-myview.blogspot.com/
>
> Disclaimer: Please keep in mind that my own opinions are my own opinions
> and do not reflect on the IIUG, nor any other organization with which I am
> associated either explicitly, implicitly, or by inference. Neither do
> those opinions reflect those of other individuals affiliated with any
> entity with which I am affiliated nor those of the entities themselves.
>
> On Tue, Aug 11, 2015 at 3:40 PM, Frank Langelage <frank@lafr.de> wrote:
>
> > Hello,
> >
> > I'm using Wildfly application server (JEE server) together with Informix
> > 12.10.FC5 as the database on Oracle Solaris SPARC 10.
> > It's using distributed (XA) transaction using 2 databases on the same
> > instance in this case.
> > On start up the server gets stuck at some point and then prints out a
> > transaction timeout.
> > On the database level I see the output shown below. Note the session
> > 3018 with flags T--P---.
> > According to http://www.oninit.com/onstat/index.php?id=u the first flag
> > T means: Waiting on a transaction. Can anybody explain what this means
> > exactly?
> >
> > If only the wildfly10 instance database is on this Informix instance and
> > the application database on another Informix instance or on another DBMS
> > like Oracle the problem does not appear.
> > I already reduced isolation level to dirty read, but this did not help.
> >
> > Any hints?
> >
> > Regards, Frank
> >
> > ---------------------------------
> >
> > IBM Informix Dynamic Server Version 12.10.FC5IE -- On-Line -- Up 27 days
> > 23:35:43 -- 1540096 Kbytes
> > Userthreads
> > address flags sessid user tty wait tout
> > locks nreads nwrites
> > 1147e2028 ---P--D 1 informix - 0 0 0
> > 46 500
> > 1147e28e8 ---P--F 0 informix - 0 0 0
> > 0 13078
> > 1147e31a8 ---P--F 0 informix - 0 0 0
> > 0 524
> > 1147e3a68 ---P--F 0 informix - 0 0 0
> > 0 4943
> > 1147e4328 ---P--F 0 informix - 0 0 0
> > 0 4
> > 1147e4be8 ---P--F 0 informix - 0 0 0
> > 0 10
> > 1147e54a8 ---P--F 0 informix - 0 0 0
> > 0 0
> > 1147e5d68 ---P--F 0 informix - 0 0 0
> > 0 0
> > 1147e6628 ---P--F 0 informix - 0 0 0
> > 0 0
> > 1147e6ee8 ---P--- 9 informix - 0 0 0
> > 0 0
> > 1147e77a8 ---P--B 10 informix - 0 0 0
> > 286591 576
> > 1147e8068 Y--P--D 11 informix - 1159705d8 0 0
> > 37637603 0
> > 1147e8928 ---P--D 12 informix - 0 0 0
> > 0 0
> > 1147e91e8 Y--P--- 3012 mbi - 1181032f8 0 2
> > 0 0
> > 1147e9aa8 ---P--D 16 informix - 0 0 0
> > 0 0
> > 1147ea368 Y--P--- 3016 mbi - 1179ec6e8 0 2
> > 0 0
> > 1147eac28 ---P--D 17 informix - 0 0 0
> > 2 0
> > 1147eb4e8 ---P--D 18 informix - 0 0 0
> > 0 0
> > 1147ebda8 ---P--D 19 informix - 0 0 0
> > 0 0
> > 1147ec668 ---P--- 32 informix - 0 0 1
> > 7037 39254
> > 1147ecf28 Y--P--D 28 informix - 10a2ddc30 0 0
> > 0 0
> > 1147ed7e8 ---P--- 30 informix - 0 0 1
> > 11 0
> > 1147ee0a8 ---P--- 31 informix - 0 0 2
> > 317 47207
> > 1147ee968 ---P--- 33 informix - 0 0 1
> > 2609 39140
> > 1147ef228 Y--P--- 3017 mbi - 117ea8028 0 0
> > 0 0
> > 1147efae8 Y--P--- 2999 mbi - 1180f1348 0 1
> > 0 0
> > 1147f03a8 Y--P--- 3015 mbi - 11675e388 0 2
> > 0 0
> > 1147f0c68 Y--P--- 3014 mbi - 1162f96e8 0 2
> > 0 0
> > 1147f1528 Y--P--- 3019 mbi - 116fd06e8 0 2
> > 0 0
> > 1147f1de8 Y--P--- 2997 mbi - 116dc8778 0 1
> > 0 0
> > 1147f26a8 Y--P--- 2995 mbi - 1180f1978 0 1
> > 0 0
> > 1147f2f68 Y--P--- 3013 mbi - 1166cdd18 0 2
> > 0 83
> > 1147f3828 Y--P--- 3004 mbi - 117ea8e38 0 1
> > 0 0
> > 1147f40e8 T--P--- 3018 mbi - 114831500 0 0
> > 0 0
> > 34 active, 128 total, 36 maximum concurrent
> >
> > Sess SQL Current Iso Lock SQL ISAM F.E.
> > Id Stmt type Database Lvl Mode ERR ERR Vers
> > Explain
> > 3019 - wildfly10 DRU Wait 10 0 0 9.28 Off
> > 3018 - wildfly10 DRU Wait 10 0 0 9.28 Off
> > 3017 SELECT neu2e_langfr DRU Wait 8 0 0 9.28 Off
> > 3016 - neu2e_langfr DRU Wait 8 0 0 9.28 Off
> > 3015 - wildfly10 DRU Wait 10 0 0 9.28 Off
> > 3014 - neu2e_langfr DRU Wait 8 0 0 9.28 Off
> > 3013 - wildfly10 DRU Wait 10 0 0 9.28 Off
> > 3012 SELECT wildfly10 DRU Wait 10 0 0 9.28 Off
> > 3004 - neu2e_langfr DR Wait 0 0 9.35 Off
> > 2999 - neu2e_langfr DR Wait 0 0 9.35 Off
> > 2997 SELECT neu2e_langfr DR Wait 0 0 9.35 Off
> > 2995 - neu2e_langfr DR Wait 0 0 9.35 Off
> > 33 sysadmin DR Wait 5 0 0 - Off
> > 32 sysadmin DR Wait 5 0 0 - Off
> > 31 sysadmin DR Wait 5 0 0 - Off
> > 30 sysadmin CR Not Wait 0 0 - O
> >
> >
> >
> >
>
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> --001a113ebc3c8c5e93051d1003e7
>
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>
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