192 Certification Study Guide Series: IBM Maximo Asset Management V7.1 The Logging application has two table panels ( Figure 10- 1): Root Loggers is for defining the basic loggers of the product. Loggers is for defining the child loggers that extend from a basic logger. Figure 10- 1 Logging application 10.3 Log files The application server keeps log files of connections, exceptions, and other failures discovered by the application server in real- time. These logs are often helpful in diagnosing errors, in particular EAR ( Enterprise ARchive) files and other back- end operations, such as database connections. As an example, if performance is slow, the administrator can start by reviewing these log files: systemerr. log This file logs connections, exceptions, and other failures experienced by the WebSphere Application Server in its day- to- day running. systemout. log This file also logs connections, exceptions, and other failures experienced by the WebSphere application server. Note: You can apply logging changes to the application server without interrupting users by selecting Apply Settings from the Select Action menu. This step has no effect on the existing users sessions.