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FIGURE 1-3. Differences between traditional and grid computing
The three applications at the bottom are interlaced with one another. The benefits application can be hosted on from one to three of the available servers. As well, the database files that support these three applications can reside upon, and be read from, any of the nine disks in the grid's disk farm.
The browser-based OEM Grid Control holds the whole thing together. With the implementation of the ASM component of Oracle Database 10g, disks are managed by OEM, database instances are managed by OEM, clusterware is managed through OEM, and the list is endless. Figure 1-4 shows the first OEM screen that appears after entering appropriate login credentials.
NOTE
There is an OEM configuration program (called emca) that must be successfully run before you can access the browser-based OEM. The screen shown in your version of Oracle Database 10g may be somewhat different than that shown in Figure 1-4. The look and feel of the OEM Grid Control screens can change significantly between minor releases of the software.
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