mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-24 08:32:02 +00:00
40 lines
3.3 KiB
Markdown
40 lines
3.3 KiB
Markdown
---
|
|
slug: /en/operations/system-tables/table_engines
|
|
---
|
|
# table_engines
|
|
|
|
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](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-data_skipping-indexes).
|
|
- `supports_ttl` (UInt8) — Flag that indicates if table engine supports [TTL](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl).
|
|
- `supports_sort_order` (UInt8) — Flag that indicates if table engine supports clauses `PARTITION_BY`, `PRIMARY_KEY`, `ORDER_BY` and `SAMPLE_BY`.
|
|
- `supports_replication` (UInt8) — Flag that indicates if table engine supports [data replication](../../engines/table-engines/mergetree-family/replication.md).
|
|
- `supports_duduplication` (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`](../../operations/settings/settings.md#settings-max-insert-threads) setting).
|
|
|
|
Example:
|
|
|
|
``` sql
|
|
SELECT *
|
|
FROM system.table_engines
|
|
WHERE name in ('Kafka', 'MergeTree', 'ReplicatedCollapsingMergeTree')
|
|
```
|
|
|
|
``` text
|
|
┌─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**
|
|
|
|
- MergeTree family [query clauses](../../engines/table-engines/mergetree-family/mergetree.md#mergetree-query-clauses)
|
|
- Kafka [settings](../../engines/table-engines/integrations/kafka.md#table_engine-kafka-creating-a-table)
|
|
- Join [settings](../../engines/table-engines/special/join.md#join-limitations-and-settings)
|