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22 lines
624 B
Markdown
22 lines
624 B
Markdown
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# Table engines
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The table engine (type of table) determines:
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- How and where data is stored: where to write it to, and where to read it from.
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- Which queries are supported, and how.
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- Concurrent data access.
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- Use of indexes, if present.
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- Whether multithreaded request execution is possible.
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- Data replication.
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- When reading data, the engine is only required to extract the necessary set of columns.However, in some cases, the query may be partially processed inside the table engine.
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Note that for most serious tasks, you should use engines from the MergeTree family.
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```eval_rst
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.. toctree::
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:glob:
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*
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```
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