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## Chapter 19. High Availability

| Note
The High Availability features are only available in the Neo4j Enterprise Edition.

Neo4j High Availability or “Neo4j HA” provides the following two main features:

1. It enables a fault-tolerant database architecture, where several Neo4j slave databases can be configured to be exact replicas of a single Neo4j master database. This allows the end-user system to be fully functional and both read and write to the database in the event of hardware failure.
2. It enables a horizontally scaling read-mostly architecture that enables the system to handle more read load than a single Neo4j database instance can handle.

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