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Implementing Siebel eBusiness Applications on DB2 UDB for OS/390 and z/OS > Preparing for Implementation on the DB2 Host >

Estimating the Storage Space Required

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The space needed by DB2 varies primarily based on the total number and types of users supported. Consult the IBM DB2 UDB for OS/390 and z/OS technical documentation for more information on these requirements.

The space required for Siebel data and indexes varies depending on what Siebel functionality you implement and the amount and nature of data supporting it. The process for making accurate database size calculations is a complex one involving many variables. The following guidelines will assist you in the process:

Determine the total number, and types, of users of Siebel eBusiness Applications (for example, 500 sales representatives and 75 sales managers).
Determine the Siebel functionality that you will implement and the entities required to support them. Typically, the largest entities are:
Accounts
Activities
Contacts
Forecasts
Opportunities
Service Requests
Estimate the average number of entities per user (for example, 100 accounts per sales representative) and calculate an estimated total number of records per entity for your total user base.
Using standard sizing procedures for your specific database, and the Siebel Schema definition, calculate the average record size per entity and multiply by the total number of records. Typically, these entities span multiple physical tables, all of which must be included in the row size calculation. This calculation determines the estimated data sizes for the largest entities.
You must add extra space for the storage of other Siebel data. A rough guideline for this amount is one-half the storage required.
Be sure to allow for a margin of error in your total size calculation.
Be sure to factor growth rates into your total size calculation.

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