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3.8 KiB
3.8 KiB
slug |
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/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 forname
.
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 │ │
└─────────────────────┴────────────┴──────────────────────────────┴───────────────────────────────────────────────────────────────────────┴──────────────────────────────────────┴────────────────────────────────────────────────────────┴─────────┘