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Under the procs subheading in the CPU part of the output, the first column, r, refers to the run queue. If your system has 24 CPUs and your run queue shows 20, that means 20 processes are waiting in the queue for a turn on the CPUs, and it is definitely not a bad thing. If the same r value of 24 occurs on a machine with 2 CPUs, it indicates the system is CPU-bound a large number of processes are waiting for CPU time. In the CPU part of vmstat s output, us stands for the amount of CPU usage attributable to the users of the system, including your database processes. The sy part shows the system usage of the CPU, and id stands for the amount of CPU that is idle. In our example, roughly 70 percent of the CPU is idle for each of the four processors, on average.

The iostat utility gives you input/output statistics for all the disks on your system. The output is displayed in four columns: device: The disk device whose performance iostat is measuring bps: The number of kilobytes transferred from the device per second sps: The number of disk seeks per second msps: The time in milliseconds per average seek

You can use the DBMS_STATS package to manually collect optimizer statistics at the table, schema, or database level, as well as to gather system statistics, and I show how to do this in 19. As of Oracle Database 10g, the recommended way to collect optimizer statistics, however, is to let the database automatically do it for you. Under some situations, such as the following, however, you must use the traditional DBMS_STATS package to gather statistics, instead of relying on Oracle s automatic statistics collection: When using external tables When collecting system statistics For collecting statistics on fixed objects, such as the dynamic performance tables Immediately after you run a bulk load job, since this will make your existing statistics unrepresentative

Figure 5-10. How messages are delivered to a Java message-driven bean Messages sent to MDBs must be formatted according to the Java Message Service (JMS) specification. I ll describe JMS in more detail a bit later in this chapter. For the moment, suffice it to say that JMS messages come in several different flavors to handle common payload types such as strings, name-value pairs, binary data, and streams. All MDBs are required to implement two basic interfaces, as shown in the class diagram in Figure 5-11.

DBAs sometimes maintain thousands of datafiles for each database they manage, so an Oracle storage solution should provide both high-performance I/O and failure-proof storage hardware In fact, file and I/O management is what usually takes up a large part of an Oracle DBA s time With Oracle s new ASM feature, you can automate traditional file management tasks Under an ASM system, the Oracle DBA is in charge of the management of physical storage from within Oracle s framework, instead of relying on the system administrator Using the ASM disk groups, you can address sets of disks simultaneously, instead of individual disks, and the database can dynamically configure storage based on changing workloads By allowing the Oracle DBA the flexibility to manage complex storagemanagement devices across various server and storage platforms, ASM becomes a crucial part of Oracle s grid computing initiative.

ASM is built on OMF, which means you don t have to worry about specifying filenames and locations when creating new databases all you have to do is identify an ASM disk group, which consists of a set of disks When you create a database or add a file, you can use familiar CREATE, ALTER, and DROP SQL statements to allocate disk space ASM acts as Oracle s built-in Logical Volume Manager by handling striping and mirroring functions previously managed by third-party tools Under ASM, disks are grouped and managed by the database itself and made available for creating tablespaces You don t have to mount the files as with the normal Linux or UNIX file systems You also can t use the traditional tools, such as cp and tar, to copy the ASM files, nor can you describe them using the ls command.

interface EnterpriseBean +ejbCreate()