How to read weblogic tlog files ?

What are tlog files ?

Tlog files are the files used by weblogic to keep a trace of current transactions.

For example, when an instance is restarted, the tlog files are used to perform the second step of a two-phase commit on a transaction that was in progress.

Sometimes, when a transaction is corrupted, you've got to delete thes files to get rid of the phantom transaction.

There is no need to restart a server to have them recreated.

Where are they located ?

Tlog files are created for every server. You can thus find some in your server directory.

Ex : myDomain / servers / myServer / logs

 

How to read them ?

These files are not human-readable. But BEA provides a tool to decrypt them.

This tool is very useful to have a trace of running transactions, and know what's going on on your server.

Like every other tool BEA provides, it's part of the package "weblogic".

It can be found :

• on WLS 8.1 and below, in the weblogic.jar
• on WLS 9 and above, in the module com.bea.core.transaction_2.0.1.0.jar

Usage: java weblogic.transaction.internal.TransactionLoggerImpl <server_tlog_path>
<server_tlog_path> - path of server transaction log files
e.g. /weblogic/config/mydomain/myserver/myserver

 

To use it, I would advise to go directly where the tlog files are and type the following command :

\user_projects\sample\myserver > java weblogic.transaction.internal.TransactionLoggerImpl myserver

The result of this command should display something like that :

 

 

If available, the information will be displayed like shown below :

 

 

Mots clés Technorati : weblogic,tlog,transaction log