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Figure 3-3. A typical GlancePlus session in text mode Note that this session shows memory usage in detail because GlancePlus was invoked with the -m option (glance -c would give you a report on CPU usage, and glance -d would give you a disk usage report). GlancePlus also has an attractive and highly useful GUI interface, which you can invoke by using the command gpm.

Performance: You can use the Grid Control to view host performance, including CPU usage, memory, disk I/O, etc. You can view current CPU load and swap utilization on your system without using operating system tools like sar and top. Configuration: You can view the hardware and software configuration on the host. If you wish, you can perform a side-by-side comparison of any two hosts on your system. This enables you to identify the differences between a development and production server, for example. You will see the differences in operating system patches, packages, and Oracle software versions.

Besides monitoring the CPU and memory on the system, you need to monitor the network to make sure there are no serious traffic bottlenecks. The netstat utility comes in handy for this purpose, and it works the same way on UNIX as it does on the Windows servers.

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You can monitor the application servers in your environment by clicking the Targets tab and then clicking the Web Applications link. You ll see a list of all the Web applications in your system here, and you can click on a specific application to examine its performance. In addition to monitoring your web applications, you can also monitor the web servers used by your applications, including the Oracle Application Server instances.

The topic of physical storage and using the disk system in UNIX is extremely important for the DBA the choice of disk configuration has a profound impact on the availability and the performance of the database. Some Oracle databases benefit by using raw disk storage instead of disks controlled by the UNIX operating system. The Oracle Real Application Clusters (RACs) can only use the raw devices; they can t use the regular UNIX-formatted disks. All the UNIX files on a system make up its file system, and this file system is created on a disk partition, which is a slice of a disk, the basic storage device.

The Groups sub-tab under the Targets tab lists all the groups defined in Grid Control. The Grid Control s Groups capability lets you organize your databases and hosts into related groups. For example, you can collect all your production databases into a group called Production Databases. Groups let you run a job in all related targets with a single command. In addition, you can view all alerts and configuration policy violations in your production databases separately from the development and test databases. You can perform the following tasks from the Groups page: Add, remove, and configure groups Access a group s home page View alerts and policy violations for a group

The choices you make about how you configure your disk storage will have a major impact on the performance and the uptime of your database. It s not a good idea to make storage device decisions in a vacuum; rather, you should consider your database applications and the type of database that is going to be located on the storage systems when making these decisions. For example, if you have a data warehouse, you may want your system administrator to use larger striping sizes for the disks. If you are going to have large numbers of writes to or reads from the database, you need to choose the appropriate disk configuration. Compared to the technologies of only a few years ago, today s ultra-sophisticated storage technologies make it possible to have both a high level of performance and high availability of data simultaneously. Still, you have plenty of choices to make that will have an impact on performance and availability. The nature of the I/Os, database caches, read/write ratios, and other issues are fundamentally different in OLTP and DSS systems. Also, response-time expectations are significantly different between OLTP and DSS systems. Thus, a storage design that is excellent for one type of database may be a terrible choice for another type, so you need to learn more about the operational needs of your application at the physical design stage to make smart choices in this extremely critical area.

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