text: **10.3 Configuring for migration and expiration**
  
  Many customers choose to expire their document data and indexes somewhere in the range 
  of 5 - 10 years. In one extreme, document and index data might expire daily. In another 
  extreme, document and index data might never expire. 
  
  Four typical lifecycle scenarios are common. The Content Manager OnDemand administrator 
  selects the scenario to implement through various parameters (as shown in this section), 
  which are on the Storage Management tab of the Application Group window. The four 
  scenarios are illustrated in Figure 10-2 on page 222. 
  
  **10.3.1 Migrating index data**
  
  *Index migration*is the process by which Content Manager OnDemand moves index data from 
  the database to archive storage. Index migration optimizes database storage space. With 
  index migration, you can maintain index data for a long time. You typically migrate index data 
  only after users no longer need to access the reports. However, for legal or other 
  requirements, you often must maintain data for a number of months or years. 