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The Indexing Service manages the indexes of archived data to enable users to identify archived items that they want to retrieve. There are three levels of indexing: brief, medium and full. With brief indexing, only information about the item such as the subject and author, can be searched. With medium indexing you can also search on the content of each item, excluding phrase searches. Searching content for phrases is only available with full indexing.
When users search the archives to which they have access, the index files are searched. The more information that is indexed about an item, the quicker it is to find the item. However, the more information that is indexed about an item, the more disk space is required for the index.
When you set up Enterprise Vault, you specify where indexes are to be stored. You also specify the default level of indexing that you want to apply across the site, although you can override this for groups or archives.
The role of the Indexing Service can be summarized as follows:
On instruction from the Storage Service, the Indexing Service indexes items as they are archived. It uses the AltaVista® Search technology to create and store indexing data about each item. There is one index for each archive.
The locations of index files are specified in the Indexing Service properties.
If an index is out of date, the Indexing Service automatically updates the index.
In response to requests from the Enterprise Vault web access components, the Indexing Service searches these indexes and returns information about the archived items that match the search criteria.
As Enterprise Vault does not index the contents of items that cannot be converted to text or HTML (binary files, for example), it is not possible to search on the content of such items. However, Enterprise Vault does index the attributes of items it cannot convert, so that items can still be found in the archive.