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system.table_engines

Description​

Contains description of table engines supported by server and their feature support information.

This table contains the following columns (the column type is shown in brackets):

  • name (String) — The name of table engine.
  • supports_settings (UInt8) — Flag that indicates if table engine supports SETTINGS clause.
  • supports_skipping_indices (UInt8) — Flag that indicates if table engine supports skipping indices.
  • supports_projections (UInt8) — Flag that indicated if table engine supports projections.
  • supports_sort_order (UInt8) — Flag that indicates if table engine supports clauses PARTITION_BY, PRIMARY_KEY, ORDER_BY and SAMPLE_BY.
  • supports_ttl (UInt8) — Flag that indicates if table engine supports TTL.
  • supports_replication (UInt8) — Flag that indicates if table engine supports data replication.
  • supports_deduplication (UInt8) — Flag that indicates if table engine supports data deduplication.
  • supports_parallel_insert (UInt8) — Flag that indicates if table engine supports parallel insert (see max_insert_threads setting).
  • description (String) — A description of what the table engine does. For engines that have a dedicated documentation page, this contains the full Markdown body of that page; for the remaining engines it is a concise summary.
  • syntax (String) — How the table engine is used when creating a table. For most engines this is the ENGINE clause of a CREATE TABLE query, but some engines (such as the various kinds of views or the Loop engine) are used through other forms, such as CREATE VIEW or a SELECT from a table function.
  • examples (String) — Usage examples.
  • introduced_in (String) — The ClickHouse version in which the table engine was first introduced, in the form major.minor.
  • related (Array(String)) — The names of related table engines.

Example​

SELECT
    name,
    supports_settings,
    supports_skipping_indices,
    supports_sort_order,
    supports_ttl,
    supports_replication,
    supports_deduplication,
    supports_parallel_insert
FROM system.table_engines
WHERE name IN ('Kafka', 'MergeTree', 'ReplicatedCollapsingMergeTree')

┌─name──────────────────────────┬─supports_settings─┬─supports_skipping_indices─┬─supports_sort_order─┬─supports_ttl─┬─supports_replication─┬─supports_deduplication─┬─supports_parallel_insert─┐
│ MergeTree                     │                 1 │                         1 │                   1 │            1 │                    0 │                      0 │                        1 │
│ Kafka                         │                 1 │                         0 │                   0 │            0 │                    0 │                      0 │                        0 │
│ ReplicatedCollapsingMergeTree │                 1 │                         1 │                   1 │            1 │                    1 │                      1 │                        1 │
└───────────────────────────────┴───────────────────┴───────────────────────────┴─────────────────────┴──────────────┴──────────────────────┴────────────────────────┴──────────────────────────┘

See also​