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Veritas Storage Foundation™ for Oracle 5.0.1 Administrator's Guide

ManualsBrandsHP ManualsSoftwareHP-UX 11i Volume Management (LVM/VxVM) Software
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Mapping components
You need to understand the mapping components in the System Global Area (SGA)
and Oracle's representation of these components before you can interpret the
mapping information in Oracle's dynamic performance views.
The mapping information in Oracle's dynamic performance views consists of:
■ File components
A mapping file component is a mapping structure describing a file. It provides
a set of attributes for a file, including the file's size, number of extents, and
type. File components are exported to the user through V$MAP_FILE.
■ File extent components
A mapping file extent component describes a contiguous group of blocks
residing on one element. The description specifies the device offset, the extent
size, the file offset, the extent type (Data or Parity), and the name of the
element where the extent resides.
■ Element components
A mapping element component is a mapping structure that describes a storage
component within the I/O stack. Elements can be mirrors, stripes, partitions,
RAID5, concatenated elements, and disks.
This component contains information about the element's mapping structure,
such as the element's size, type, number of subelements, and a brief description.
Element components are exported to the user through V$MAP_ELEMENT.
■ Subelement components
A mapping subelement component describes the link between an element and
the next element in the I/O stack. The subelement component contains the
subelement number, size, the element name for the subelement, and the
element offset. Subelement components are exported to the user through
V$MAP_SUBELEMENT.
These mapping components completely describe the mapping information for an
Oracle instance.
Storage Mapping views
The mapping information that is captured is presented in Oracle's dynamic
performance views. Brief descriptions of these views are provided in Table 8-1.
For more detailed information refer to your Oracle documentation.
143Using Storage Mapping
Oracle file mapping (ORAMAP)