TPDC Manual (H06.03+, J06.03+)

TPDC Overview

Tandem Performance Data Collector (TPDC) Manual—529899-002

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How TPDC Collects Data

To serve as a useful tool throughout the performance data collection cycle, TPDC:

1. Determines the hardware and software configurations of the system to be

measured

2. Organizes measurements based on the system hardware and software

configuration

3. Starts the measurements

4. Calculates an efficient sampling interval for devices and processors

5. Samples and records information on NonStop entities

6. Retrieves data from measurements taken by the Measure product

7. Integrates and normalizes Measure data, and relates it to data from other sources

8. Creates a single consolidated data (UWS) file for subsequent analysis and

reporting

9. Creates structured format entities from the consolidated data file to be used by

other products for further analysis and reporting

Entities, Attributes, and Linkages

Entities are collections of data items about types of resources that exist on NonStop

systems. Each entity has basic attributes, or data elements, that characterize the

entity. Each attribute, or data element, contains the actual data or data value that

TPDC uses in its relational data model.

A linkage is a relationship or mapping between two sets of data entities. Linkages can

be one-to-one, one-to-many, or many-to-many. In TPDC, linkages are represented as

attributes with -LINK as their suffix. The -LINK attributes are assigned the unique 32-bit

identifier value of the related entity. Valid linkages are greater than zero. If the -LINK

attribute has a zero value, this entity is not linked.