ClickHouse의 백업 및 복원

<clickhouse>
    <backups>
        <allow_concurrent_backups>false</allow_concurrent_backups>
        <allow_concurrent_restores>false</allow_concurrent_restores>
    </backups>
</clickhouse>

BACKUP TABLE test.table
  TO Disk('backups', 'filename.zip')
  SETTINGS compression_method='lzma', compression_level=3

-- core commands
BACKUP | RESTORE 
--- what to backup/restore (or exclude)
TABLE [db.]table_name           [AS [db.]table_name_in_backup] |
DICTIONARY [db.]dictionary_name [AS [db.]name_in_backup] |
DATABASE database_name          [AS database_name_in_backup] |
TEMPORARY TABLE table_name      [AS table_name_in_backup] |
VIEW view_name                  [AS view_name_in_backup] |
[EXCEPT TABLES ...] |
[EXCEPT DATA FROM {TABLE|TABLES} ...] | -- BACKUP only, rejected on RESTORE
ALL [EXCEPT {TABLES|DATABASES}...] } [,...]
--- 
[ON CLUSTER 'cluster_name']
--- where to backup or restore to or from
TO|FROM 
File('<path>/<filename>') | 
Disk('<disk_name>', '<path>/') | 
S3('<S3 endpoint>/<path>', '<Access key ID>', '<Secret access key>', '<extra_credentials>') |
AzureBlobStorage('<connection string>/<url>', '<container>', '<path>', '<account name>', '<account key>')
--- additional settings
[SETTINGS ...]
[ASYNC]

BACKUP DATABASE mydb EXCEPT DATA FROM TABLES events, metrics TO Disk('backups', 'mydb/')

-- Backs up both tables, without the data of `t1`
BACKUP TABLE mydb.t1 EXCEPT DATA FROM TABLE mydb.t1, TABLE mydb.t2 TO Disk('backups', 'tables/')

-- Rejected: the clause of the `mydb.t2` element names a different table
BACKUP TABLE mydb.t1, TABLE mydb.t2 EXCEPT DATA FROM TABLE mydb.t1 TO Disk('backups', 'tables/')

-- Back up the definition without the rows: they are replicated from PostgreSQL and can be replicated again
BACKUP DATABASE mydb EXCEPT DATA FROM TABLE mydb.pg_table TO Disk('backups', 'mydb/')

CREATE TABLE mydb.plain_target
(
    key Int32,
    value Int32,
    _sign Int8 MATERIALIZED 1,
    _version UInt64 MATERIALIZED 1
)
ENGINE = ReplacingMergeTree(_version) ORDER BY key

-- Succeeds, and leaves `mydb.plain_target` empty because the backup carries no rows for `mydb.pg_table`
RESTORE TABLE mydb.pg_table AS mydb.plain_target FROM Disk('backups', 'mydb/')
SETTINGS allow_different_table_def = 1

BACKUP TABLE helloworld.my_first_table TO Disk('backups', '1.zip') ASYNC

┌─id───────────────────────────────────┬─status──────────┐
│ 7678b0b3-f519-4e6e-811f-5a0781a4eb52 │ CREATING_BACKUP │
└──────────────────────────────────────┴─────────────────┘

1 row in set. Elapsed: 0.001 sec.

SELECT
*
FROM system.backups
WHERE id='7678b0b3-f519-4e6e-811f-5a0781a4eb52'
FORMAT Vertical

SELECT *
FROM system.backup_log
WHERE id = '7678b0b3-f519-4e6e-811f-5a0781a4eb52'
ORDER BY event_time_microseconds ASC
FORMAT Vertical