This feature lets users with an in-depth knowledge of MIBs, extract data from one instance value and use that data as the instance for retrieving the value of another MIB object.
The elements that make up a multi-part instance or other object are formatted as a dot-delimited string (e.g., 1.2.3.4.5.6). The Extract Instance feature uses an Offset value to define the starting position within the string and a Length value to specify the number of elements to extract.
For example, setting the Offset to 3 and the Length to 4, will extract the value 3.4.5.6 from the instance, 1.2.3.4.5.6.
Extract Instance can be used two ways:
- You can use Extract Instance to extract a value from the instance of one MIB object and use that value as the instance to retrieve data from another MIB object. This is similar to Indirect Instancing, except that only a portion of the instance is used (extracted) as an instance when retrieving the data from another MIB object. The Extract Instance feature is only necessary if only part of the instance value is needed as a reference to another column.
- You can also use Extract Instance to put the extracted value directly in a column as data. SNMP operations cannot be completed on a column of type No Access, but the data for this column type is usually embedded in the instance. You can check Extract Instance for a column of type No Access to present the data extracted from the instance in the column for the No Access object.
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