SQL Tracing in TimesTen with actual data visible

Hi,
We're having some issues with our TimesTen-based application where under some circumstances (it appears to increase under load) the results appear to get 'mixed up', i.e. a query appears to not have received the right result set from the database. I know the result set is wrong because we're doing performance testing where each query should actually return exactly the same.
I also say 'appears' because I think the problem is on the client side, where multiple threads access the database simultaneously and somehow things get mixed up. This happens so deep in the application that increasing the logging on client side didn't tell me what I need to know thus far.. And before I look further, I want to exclude the possibility that the database is mixing up results from queries processed in parallel.
To accomplish that I would like to enable a TimesTen trace in ttTraceMon where the actual data returned as a result set to the client is visible. Is this possible? There are a lot of components you can trace, I haven't tried them all but at least the SQL component does not show this information, not even at the highest trace level.
Is there any way to get a view of the actual result set that is being returned to a client, before that client's driver or the application (we use JDBC) actually interprets the results?
Any clues are greatly appreciated! Thanks in advance.
We use TimesTen 11.2.2.
Kind regards,
Pieter van Wijngaarden

The answer sadly is no. There is not currently any trace level that will show data values.
If you really need to share database connections between application threads then it should be done very carefully. Some rules to observe are:
1. When a thread is using a connection it should have exclusive use of it. Do not allow multiple threads to make concurrent use of the same connection; TimesTen has internal mutex protection to avoid this causing problems for the database but due to the nature of the ODBC and JDBC APIs it is very hard at an application level to ensure correctness with this approach.
2. Many objects (statements, result sets etc.) are closely associated with a specific connection. When a thread has 'relinquished control' of a connection it should not then manipulate any object associated with that connection in any way whatsoever.
For example:
1. Thread 1 'reserves' connection 1.
2. Thread 1 issues a query on connection 1 and obtains a result set.
3. Thread 1 'releases' connection 1.
4. Thread 2 'reserves' connection 1 and starts to do some work.
5. Thread 1 starts to process values from the result set obtained in step 2.
At this point you have two threads working concurrently on connection 1 and all bets are off (and certainly you will see problems).
Code that violates these rules may seem to work okay with some databases but not with others. That is not the fault of the database but just a happy coincidence. This code pattern is just incorrect.
Also please note that, unlike Oracle DB, in TimesTen a commit or rollback operation on a connection closes / invalidates all result sets associated with that connection so again if you share connections in a way similar to the above this can also cause you problems.
Good luck with your debugging.
Chris
Edited by: ChrisJenkins on Jan 30, 2013 10:03 AM

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