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Set timeout in Informix JDBC connection?

Posted on 2009-07-13
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Last Modified: 2013-12-24
Hi experts,

In one of my projects I am having some strange Problems. Even if they occur about every 3-4 Months, I would like to get rid of them.

The problem is that I have a JDBC connection to an Informix database and use this to log changes to my data. Now about every 3-4 Months a JDBC request hangs and never returns.

Is there a way to make the JDBC driver terminate a query if it takes too long? What I want is to set a timeout to about 5 seconds (It's a really simple insert of one row of data).

Chris

PS: Is a thread dump of the hanging thread.
Thread-1022 "[STUCK] ExecuteThread: '11' for queue: 'weblogic.kernel.Default (self-tuning)'" <alive, in native, suspended, priority=1, DAEMON> {
    jrockit.net.SocketNativeIO.readBytesPinned(SocketNativeIO.java:???)
    jrockit.net.SocketNativeIO.socketRead(SocketNativeIO.java:31)
    java.net.SocketInputStream.socketRead0(SocketInputStream.java:???)
    java.net.SocketInputStream.read(SocketInputStream.java:107)
    java.io.BufferedInputStream.fill(BufferedInputStream.java:189)
    java.io.BufferedInputStream.read1(BufferedInputStream.java:247)
    java.io.BufferedInputStream.read(BufferedInputStream.java:304)
    ^-- Holding lock: java.io.BufferedInputStream@23a7b64[thin lock]
    com.informix.asf.IfxDataInputStream.readFully(IfxDataInputStream.java:133)
    com.informix.asf.IfxDataInputStream.readSmallInt(IfxDataInputStream.java:443)
    com.informix.jdbc.IfxSqli.receiveMessage(IfxSqli.java:2254)
    com.informix.jdbc.IfxSqli.executeCommand(IfxSqli.java:742)
    com.informix.jdbc.IfxResultSet.b(IfxResultSet.java:259)
    com.informix.jdbc.IfxStatement.c(IfxStatement.java:1241)
    com.informix.jdbc.IfxPreparedStatement.executeUpdate(IfxPreparedStatement.java:402)
    sun.reflect.GeneratedMethodAccessor978.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:570)
    org.apache.avalon.excalibur.datasource.AbstractJdbcConnection$ProxiedObject.invoke(AbstractJdbcConnection.java:468)
    $Proxy55.executeUpdate(Unknown Source)
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Question by:ChristoferDutz
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12 Comments
 
LVL 6

Expert Comment

by:tangchunfeng
ID: 24838529
I found you use
org.apache.avalon.excalibur.datasource.AbstractJdbcConnection
to manage jdbcConnection,
maybe you can change to use jdbc connection pool managed by weblogic
0
 
LVL 20

Author Comment

by:ChristoferDutz
ID: 24838590
Well I am using a Cocoon application and it is deployed on tomcat in the test environment and on Weblogic on the production environment. I would really like to have both configurations the same. I know the MySQL driver starts a thread monitoring JDBC threads and trminates long running operations. Does something like this exist for Informix? Is there a parameter I can add to the JDBC connection string?
0
 
LVL 6

Expert Comment

by:tangchunfeng
ID: 24845037
what's your version of tomcat/weblogic/informix jdbc/informix server?
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LVL 6

Expert Comment

by:tangchunfeng
ID: 24845104
INFORMIXCONTIME
Sets the timeout period for an attempt to connect to the database server. If a connection attempt does not succeed in this time, the attempt is aborted and a connection error is reported. The default value is 0 seconds. This variable adds timeouts for blocking socket methods and for socket connections.
This parameter is effective in Informix JDBC 3.0.
0
 
LVL 6

Expert Comment

by:tangchunfeng
ID: 24845149
http://forums.sun.com/thread.jspa?threadID=5266195&start=0

By this URL, this may be a  performance problem of db lock.
Ask your DBA to investigate db lock when the thread is stuck.
0
 
LVL 20

Author Comment

by:ChristoferDutz
ID: 24847185
Unfortunately this link didnt help a lot and the Parameter seems to affect only the connections to the db. The connection is not an issue here (by the way ... the default timeout is 60 seconds ... I know this because initially we were having problems with the connection timeout). Indeed the problem was with the Database Server undfortunately I couldn't find a way to recover the blocked thread (which blocks some important system resources).

The solution I have come up with was to create a sort of "TimebombThread" that sends the Thread that creates it a Signal if it is not disabled within 5 seconds. After processing the statement the timebomb is manually disabled. This sort of does the trick, but I would have liked to have something like this in the driver as it is in MySQL.
0
 
LVL 6

Expert Comment

by:tangchunfeng
ID: 24866728
I find a parameter in weblogic connection pool :  Statement Timeout
If you change to use weblogic managed connection pool, you will have the funcationality of "TimebombThread"
0
 
LVL 6

Accepted Solution

by:
tangchunfeng earned 1000 total points
ID: 24866744

And if you use Informix JDBC 3.00.JC3 and above,
you can add Statement.setQueryTimeout()  to your code.

http://publib.boulder.ibm.com/infocenter/idshelp/v10/index.jsp?topic=/com.ibm.docnotes.doc/uc5/jdbc_docnotes_3.00.html
0
 
LVL 6

Expert Comment

by:tangchunfeng
ID: 24867225
I tried with some Java program.

// 1 second
stmt.setQueryTimeout(1);

and execute a long running query, you will get

java.sql.SQLException: Statement interrupted by user.
      at com.informix.jdbc.IfxSqli.a(IfxSqli.java:3204)
      at com.informix.jdbc.IfxSqli.E(IfxSqli.java:3518)
      at com.informix.jdbc.IfxSqli.dispatchMsg(IfxSqli.java:2353)
      at com.informix.jdbc.IfxSqli.receiveMessage(IfxSqli.java:2269)
      at com.informix.jdbc.IfxSqli.a(IfxSqli.java:1532)
      at com.informix.jdbc.IfxSqli.executeStatementQuery(IfxSqli.java:1471)
      at com.informix.jdbc.IfxSqli.executeStatementQuery(IfxSqli.java:1401)
      at com.informix.jdbc.IfxResultSet.a(IfxResultSet.java:204)
      at com.informix.jdbc.IfxStatement.executeQueryImpl(IfxStatement.java:1212)
      at com.informix.jdbc.IfxStatement.executeQuery(IfxStatement.java:202)
      at jdbc.InformixJdbcSelect.main(InformixJdbcSelect.java:35)
Caused by: java.sql.SQLException: ISAM error: Interrupted ISAM call
      at com.informix.util.IfxErrMsg.getSQLException(IfxErrMsg.java:373)
      at com.informix.jdbc.IfxSqli.E(IfxSqli.java:3523)
      ... 9 more
0
 
LVL 6

Expert Comment

by:tangchunfeng
ID: 24867301
and you can add "QueryTimeout=5" to the informix jdbc url
0
 
LVL 20

Author Closing Comment

by:ChristoferDutz
ID: 31602731
Hi tangchunfeng,

thanks for that ... I remember having a look at that method a few years ago ... unfortunately in those days it was unsupported. My customer updated to a new release of Informix and now I can use it ... thanks for that hint :-)
0
 
LVL 6

Expert Comment

by:tangchunfeng
ID: 24867351
"jdbc:informix-sqli://192.168.1.180:9088/benchmark:INFORMIXSERVER=demo_on;user=informix;password=informix;QueryTimeout=1"

seems not working, just forget it

although it's documented by bea
http://edocs.bea.com/wls/docs103/jdbc_drivers/informix.html

I'm using INFORMIX 11.50.UC4 and
IBM Informix JDBC Driver Version 3.00.JC3
IBM Informix JDBC Driver Version 3.50.JC4DE( included with 11.50.UC4)
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