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ClickHouse provides three network interfaces (they can be optionally wrapped in TLS for additional security):

  • HTTP, which is documented and easy to use directly.
  • Native TCP, which has less overhead.
  • gRPC.

In most cases it is recommended to use an appropriate tool or library instead of interacting with those directly. The following are officially supported by ClickHouse:

There are also a wide range of third-party libraries for working with ClickHouse: