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You can always modify the default maintenance window using SQL*Plus. You can also use the OEM Database Control to change the current schedule of the GATHER_STATS_JOB schedule. Here are the steps: 1. From the Database Control home page, click the Administration tab. 2. Go to the Scheduler Group, and click the Windows link. 3. Click the Edit button. You ll then be able to edit the weeknight or the weekend window timings.

By measuring bandwidth use, you can measure the efficiency of the transfer of data between devices. Bandwidth is harder to measure than simple I/O or memory usage patterns, but it can still be immensely useful to collect bandwidth-related statistics. Your network is an important component of your system if the network connections are slow, the whole application may appear to run very slowly. Simple network statistics like the number of bytes received and sent will help you identify network problems. High network packet collision rates, as well as excessive data transmission errors, will lead to bottlenecks. You need to examine the network using tools like netstat (discussed later) to see if the network has any bottlenecks.

navigate through the rows to which an entity bean is associated. The language is called Enterprise JavaBeans Query Language (EJB QL) and is a subset of SQL-92. Clients can manipulate the data in the store through the properties and methods of entity beans. The state of entity beans (the values of the related database table row) has global scope, so entity beans can be shared across multiple clients. Entity and session beans use the same event model as ordinary JavaBeans, described earlier. A message-driven bean (MDB) is somewhat different from the other two types of EJBs. The first two expose methods that clients can call (through the container). MDBs are different: Clients interact with them by sending messages. All MDBs expose the method OnMessage. When a client sends a message to an MDB, the EJB container intercepts the message and passes it to the MDB by calling the bean s OnMessage method, as shown in Figure 5-10.

In order to find out what processes are running, you ll most commonly use the process command, ps. For example, the following example checks for the existence of the essential pmon process, to see if the database is up: $ ps -ef | grep pmon

Of course, to monitor system performance, you ll need more sophisticated tools than the elementary ps command. The following sections cover some of the important tools available for monitoring your system s performance.

The vmstat utility helps you monitor memory usage, page faults, processes, and CPU activity. The vmstat utility s output is divided into two parts: virtual memory (VM) and CPU. The VM section is divided into three parts: memory, page, and faults. In the memory section, avm stands for active virtual memory and free is short for free memory. The page and faults items provide detailed information on page reclaims, pages paged in and out, and device interrupt rates. The output gives you an idea about whether the memory on the system is a bottleneck during peak times. The po (page outs) variable under the page heading should ideally be 0, indicating that there is no swapping that the system is not transferring memory pages to swap disk devices to free up memory for other processes. Here is some sample output from vmstat (note that I use the -n option to improve the formatting of the output): $ vmstat -n VM memory page avm free re at pi po fr de sr 1822671 8443043 1052 113 2 0 0 0 0 CPU cpu procs us sy id r b w 23 7 69 8 23 0 22 8 70 21 7 72 22 7 71 $

EJB Container JMS Server or Other Source of JMS Messages Message OnMessage(message)