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IDS Forum

Re: Session "Waiting on a transaction"

Posted By: Frank Langelage
Date: Sunday, 23 August 2015, at 7:36 a.m.

In Response To: Re: Session "Waiting on a transaction" (Art Kagel)

Thanks Art.
But as I am using an Java Enterprise Edition application server I do not
have this level of control over the statements and the connections used.
The aplication server handles the connections and transactions.
Different database, different connection.

Frank

On 23.08.15 11:11, Art Kagel wrote:
> Frank:
>
> If you just use the SQL "BEGIN WORK" and "COMMIT WORK" Informix can manage
> the transaction across multiple databases and servers without having to
> use XA transactions. Just process inserts, updates, and deletes to both
> databases through a single connection as remote references. Example:
>
> connect to database1@servername;
> begin work;
> update local_table1 set col1 = value1 where key1 = 123456;
> update database2@servername:remote_table1 set col3 = value3 where key =
> 54326;
> commit work;
>
> Since the second database resides in the same server as the connected
> database the reference to "database2@servername" doesn't strictly require
> the "@servername" reference, but I include it for completeness. Informix
> will handle updating the tables in both database (whether in the same
> server instance or different instances) including managing the possibility
> that it will lose connectivity with the "remote" database's server using
> two-phase commit protocols. This is stated in the Administrator's Guide on
> page 1-8 and here is a Wiki reference describing the protocol:
> https://en.wikipedia.org/wiki/Two-phase_commit_protocol
>
> I hope this helps.
>
> 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 Sun, Aug 23, 2015 at 3:44 AM, Frank Langelage <frank@lafr.de> wrote:
>
>> Art,
>>
>> could you explain more about this or reference a documentation?
>> I never heard of it.
>> But I'm bound to what application server supports.
>>
>> Frank
>>
>> On 11.08.15 23:45, Art Kagel 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
>>>>
>>>>
>>>>
>>>>
>>
> *******************************************************************************
>>>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>>>
>>>>
>>> --001a113ebc3c8c5e93051d1003e7
>>>
>>>
>>>
>>
> *******************************************************************************
>>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>>
>>>
>>
>>
>>
> *******************************************************************************
>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>
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> --089e01184b9ad52973051df6e24e
>
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