> ## Documentation Index
> Fetch the complete documentation index at: https://private-7c7dfe99-mintlify-67bc7bf8.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# General questions about ClickHouse

> Index page listing general questions about ClickHouse

| Page                                                                                                                                                         | Description                                                          |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------- |
| [What is a columnar database?](/resources/support-center/knowledge-base/general-faqs/columnar-database)                                                      | Explainer on what a columnar database is.                            |
| [Does ClickHouse support frequent, concurrent queries?](/resources/support-center/knowledge-base/general-faqs/concurrency)                                   | Information about concurrent query support in ClickHouse.            |
| [Does ClickHouse have a cost-based optimizer?](/resources/support-center/knowledge-base/general-faqs/cost-based)                                             | Information about ClickHouse's query optimizer.                      |
| [Does ClickHouse support data lakes?](/resources/support-center/knowledge-base/general-faqs/datalake)                                                        | Information about ClickHouse data lake support.                      |
| [What does "ClickHouse" mean?](/resources/support-center/knowledge-base/general-faqs/dbms-naming)                                                            | Explainer on the meaning of the name "ClickHouse".                   |
| [What are the 3rd-party dependencies for running ClickHouse?](/resources/support-center/knowledge-base/general-faqs/dependencies)                            | Information about ClickHouse third-party dependencies.               |
| [Does ClickHouse support distributed JOIN?](/resources/support-center/knowledge-base/general-faqs/distributed-join)                                          | Information about distributed JOIN support in ClickHouse.            |
| [Does ClickHouse support federated queries?](/resources/support-center/knowledge-base/general-faqs/federated)                                                | Information about federated query support in ClickHouse.             |
| [How do I contribute code to ClickHouse?](/resources/support-center/knowledge-base/general-faqs/how-do-i-contribute-code-to-clickhouse)                      | How to contribute code to the ClickHouse project.                    |
| [Why not use something like MapReduce?](/resources/support-center/knowledge-base/general-faqs/mapreduce)                                                     | Why MapReduce implementations aren't appropriate for OLAP scenarios. |
| [What does "Не тормозит" mean?](/resources/support-center/knowledge-base/general-faqs/ne-tormozit)                                                           | Explainer on what "не тормозит" means.                               |
| [What is OLAP?](/resources/support-center/knowledge-base/general-faqs/olap)                                                                                  | Explainer on Online Analytical Processing.                           |
| [What SQL syntax does ClickHouse support?](/resources/support-center/knowledge-base/general-faqs/sql)                                                        | Information about ClickHouse SQL syntax support.                     |
| [Does ClickHouse support real-time updates?](/resources/support-center/knowledge-base/general-faqs/updates)                                                  | Information about real-time updates in ClickHouse.                   |
| [Who is using ClickHouse?](/resources/support-center/knowledge-base/general-faqs/who-is-using-clickhouse)                                                    | Learn about who is using ClickHouse.                                 |
| [Why is ClickHouse Keeper recommended over ZooKeeper?](/resources/support-center/knowledge-base/general-faqs/why-recommend-clickhouse-keeper-over-zookeeper) | Why ClickHouse Keeper is recommended over ZooKeeper.                 |

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