# Compact the IDOL Servers

The `DRECOMPACT` index action allows the DIH to reduce the space that documents take up in the IDOL Servers. The compact operation (similar to the defragmentation process) uses new documents to fill up the space that has been created through the deletion of other documents. Use the following action syntax:

    http://DIHhost:IndexPort/DRECOMPACT?

When you send this action to the DIH instead of to an IDOL Server, note:

- `DIHhost` is the IP address (or name) of the machine on which the DIH is installed, and `IndexPort` is the number of the port that you use to send index actions to the DIH.
- This action compacts all child IDOL servers of the DIH.

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