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them. The ASM instance manages and works with the disk groups, and the database instance works with the data files. Figure 9-10 illustrates this architecture.
The following points address the key components in Figure 9-10:
The ASM instance manages the disk groups and ASM files. The names of the ASM files in each disk group are system generated. The ASM instance maintains a map of data files and disks.
The database instance accesses the ASM files directly, not the disk groups. In order to do this, the database instance must communicate with the ASM instance to request the names and locations of ASM data files required.
A database can contain both ASM and non-ASM files and the database instance can access either type.
FIGURE 9-8. Automatic Storage Management
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