# Distributed Action Handler

The DAH distributes actions between IDOL Servers, or components.

The most common use of DAH is to distribute queries to multiple Content components or IDOL Server. In this case, DAH can either distribute between identical IDOL Servers, for load balancing and failover, or it can distribute and combine results from multiple IDOL Servers that each contain a part of the whole index.

You can also use DAH to distribute actions between multiple copies of any ACI server. In this case, it can balance load over servers to allow you to scale your system.

- DAH Distribution Modes. The different ways to distribute actions with the DAH, and when to choose a particular mode.

- Engine Management in DAH. Manage the DAH child servers.

Related Topics

- Distribute View Servers

- Distributed Index Handler

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