The PowerCenter Integration Service process creates a session log for each session it runs. It writes information in the session log such as initialization of processes, session validation, creation of SQL commands for reader and writer threads, errors encountered, and load summary. The amount of detail in the session log depends on the tracing level that you set. You can view the session log from the PowerCenter Workflow Monitor. You can also configure the session to write the log information to a log file in a specified directory.