Repository

A Repository contains three parts:

• The security domain contains the characteristics of the other domains, as well as user definitions and access rights.

• Universe domains are meta-models of the database containing a description of the data to be accessed.

• Document domains contains the structures for storing shared documents and for executing tasks according to a time stamped definition. When initially installed, the repository takes up roughly 1 MB. Its size increases as data is added. The security and universe domains expand relatively little per user, group or universe. It is the document domain that typically takes up the most space.

The security domain
The security domain is the core of the repository and is used to store all information about users, the groups they belong to, the applications and features they can use, the universes they have access to, the documents they have shared, and the list of tasks submitted to BROADCAST AGENT.

Space requirements per user When they are created by the supervisor, all users require 4 KB of disk space in the security domain. If they belong to more than one user group, however, users
should be counted as many times as they appear in the repository. For example, if particular users belongs to five users groups, they should be counted five times. Later on, users will need 1.5 KB per constraint (link between the users and documents, accessible universes, etc.) + 0.4 KB per document + 1.5 KB per task
submitted to BROADCAST AGENT, of disk space in the security domain.

To be safe, we consider that an average user will have 100 constraints, 100 documents and 100 tasks. Thus the average user will need up to 344 KB in the security domain. By providing a safety margin, we round this figure up to 400 KB, or 0.4 MB, for each user.
You can therefore calculate the initial required disk space for the security domain

using this formula:
number of registered users * 0.4 MB

The universe domain
The universe domain is used to store the contents of each shared universe. This is the area to which designers can export the universes that they create. Each universe is a meta-model of the related corporate database. For every universe domain, a document domain must also exist in the same database account. This document domain will store the list of values files. 

You can calculate the initial required disk space for the universe domain using
this formula:
number of universes * 0.5 MB

The document domain
The document domain is used to store the contents of each shared document and file. This is the area to which users can publish Business Objects documents, or upload other types of files, to be shared by all users. This is also where documents such as templates, scheduled documents, and documents or files sent from users
to other users are stored. BROADCAST AGENT accesses the document domain to run automated Business Objects document-processing tasks.
To begin with, you should allow 150 MB for the document domain. Be sure, however, to monitor how fast the content grows, and add more if necessary! As BUSINESSOBJECTS 5.1 and WEBINTELLIGENCE 2.7 can process all other types of files, you will need to be especially vigilant about allowing enough space for those files as well.

In many deployments, administrators choose to create multiple repository domains to support the requirements of their organizations. For instance, it is possible to create a deployment that features a single security domain, two universe domains and five document domains.