# Set Up Document Tracking

Document tracking is a feature present in IDOL components that are involved in indexing. It reports upon the progress of documents as they pass through an index chain. Every time a document reaches a certain stage in the indexing process, the component commits event data to a back end, which stores the events.

The back end can be a log file, or an SQL database (this option requires an additional library, which is available in the IDOL Server installer). You retrieve the events by using an appropriate interface for your chosen back end, for example an SQL client for a database.

This section describes how to set up document tracking using either SQL or IDOL log files as a back end.

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