thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-12-15 02:41:59 +00:00
Code Issues Packages Projects Releases Wiki Activity
56f040734d
ClickHouse/docs/en/operations/system-tables/databases.md

3.8 KiB
Raw Blame History

slug
/en/operations/system-tables/databases

databases

Contains information about the databases that are available to the current user.

Columns:

  • name (String) — Database name.
  • engine (String) — Database engine.
  • data_path (String) — Data path.
  • metadata_path (String) — Metadata path.
  • uuid (UUID) — Database UUID.
  • comment (String) — Database comment.
  • engine_full (String) — Parameters of the database engine.
  • database (String) – Alias for name.

The name column from this system table is used for implementing the SHOW DATABASES query.

Example

Create a database.

CREATE DATABASE test;

Check all of the available databases to the user.

SELECT * FROM system.databases;

┌─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                                                 │         │
└─────────────────────┴────────────┴──────────────────────────────┴───────────────────────────────────────────────────────────────────────┴──────────────────────────────────────┴────────────────────────────────────────────────────────┴─────────┘