mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-28 02:21:59 +00:00
44 lines
3.7 KiB
Markdown
44 lines
3.7 KiB
Markdown
---
|
|
slug: /en/operations/system-tables/databases
|
|
---
|
|
# databases
|
|
|
|
Contains information about the databases that are available to the current user.
|
|
|
|
Columns:
|
|
|
|
- `name` ([String](../../sql-reference/data-types/string.md)) — Database name.
|
|
- `engine` ([String](../../sql-reference/data-types/string.md)) — [Database engine](../../engines/database-engines/index.md).
|
|
- `data_path` ([String](../../sql-reference/data-types/string.md)) — Data path.
|
|
- `metadata_path` ([String](../../sql-reference/data-types/enum.md)) — Metadata path.
|
|
- `uuid` ([UUID](../../sql-reference/data-types/uuid.md)) — Database UUID.
|
|
- `comment` ([String](../../sql-reference/data-types/enum.md)) — Database comment.
|
|
- `engine_full` ([String](../../sql-reference/data-types/enum.md)) — Parameters of the database engine.
|
|
|
|
The `name` column from this system table is used for implementing the `SHOW DATABASES` query.
|
|
|
|
**Example**
|
|
|
|
Create a database.
|
|
|
|
``` sql
|
|
CREATE DATABASE test;
|
|
```
|
|
|
|
Check all of the available databases to the user.
|
|
|
|
``` sql
|
|
SELECT * FROM system.databases;
|
|
```
|
|
|
|
``` text
|
|
┌─name────────────────┬─engine─────┬─data_path────────────────────┬─metadata_path─────────────────────────────────────────────────────────┬─uuid─────────────────────────────────┬─engine_full────────────────────────────────────────────┬─comment─┐
|
|
│ INFORMATION_SCHEMA │ Memory │ /data/clickhouse_data/ │ │ 00000000-0000-0000-0000-000000000000 │ Memory │ │
|
|
│ default │ Atomic │ /data/clickhouse_data/store/ │ /data/clickhouse_data/store/f97/f97a3ceb-2e8a-4912-a043-c536e826a4d4/ │ f97a3ceb-2e8a-4912-a043-c536e826a4d4 │ Atomic │ │
|
|
│ information_schema │ Memory │ /data/clickhouse_data/ │ │ 00000000-0000-0000-0000-000000000000 │ Memory │ │
|
|
│ replicated_database │ Replicated │ /data/clickhouse_data/store/ │ /data/clickhouse_data/store/da8/da85bb71-102b-4f69-9aad-f8d6c403905e/ │ da85bb71-102b-4f69-9aad-f8d6c403905e │ Replicated('some/path/database', 'shard1', 'replica1') │ │
|
|
│ system │ Atomic │ /data/clickhouse_data/store/ │ /data/clickhouse_data/store/b57/b5770419-ac7a-4b67-8229-524122024076/ │ b5770419-ac7a-4b67-8229-524122024076 │ Atomic │ │
|
|
└─────────────────────┴────────────┴──────────────────────────────┴───────────────────────────────────────────────────────────────────────┴──────────────────────────────────────┴────────────────────────────────────────────────────────┴─────────┘
|
|
|
|
```
|