Querying in ClickHouse CloudThe data in this system table is held locally on each node in ClickHouse Cloud. Obtaining a complete view of all data, therefore, requires the clusterAllReplicas function. See here for further details. Description
Contains logging entries with information about BACKUP and RESTORE operations.
Columns
hostname (LowCardinality(String)) — Hostname of the server executing the query.event_date (Date) — Date of the entry.event_time (DateTime) — Time of the entry.event_time_microseconds (DateTime64(6)) — Time of the entry with microseconds precision.id (String) — Identifier of the backup or restore operation.name (String) — Name of the backup storage (the contents of the FROM or TO clause).base_backup_name (String) — The name of base backup in case incremental one.query_id (String) — The ID of a query associated with a backup operation.status (Enum8(‘CREATING_BACKUP’ = 0, ‘BACKUP_CREATED’ = 1, ‘BACKUP_FAILED’ = 2, ‘RESTORING’ = 3, ‘RESTORED’ = 4, ‘RESTORE_FAILED’ = 5, ‘BACKUP_CANCELLED’ = 6, ‘RESTORE_CANCELLED’ = 7)) — Operation status.error (String) — Error message of the failed operation (empty string for successful operations).start_time (DateTime64(6)) — Start time of the operation.end_time (DateTime64(6)) — End time of the operation.num_files (UInt64) — Number of files stored in the backup.total_size (UInt64) — Total size of files stored in the backup.num_entries (UInt64) — Number of entries in the backup, i.e. the number of files inside the folder if the backup is stored as a folder, or the number of files inside the archive if the backup is stored as an archive. It is not the same as num_files if it’s an incremental backup or if it contains empty files or duplicates. The following is always true: num_entries ≤ num_files.uncompressed_size (UInt64) — Uncompressed size of the backup.compressed_size (UInt64) — Compressed size of the backup. If the backup is not stored as an archive it equals to uncompressed_size.files_read (UInt64) — Number of files read during the restore operation.bytes_read (UInt64) — Total size of files read during the restore operation.
Example
BACKUP TABLE test_db.my_table TO Disk('backups_disk', '1.zip')
┌─id───────────────────────────────────┬─status─────────┐
│ e5b74ecb-f6f1-426a-80be-872f90043885 │ BACKUP_CREATED │
└──────────────────────────────────────┴────────────────┘
SELECT * FROM system.backup_log WHERE id = 'e5b74ecb-f6f1-426a-80be-872f90043885' ORDER BY event_date, event_time_microseconds \G
Row 1:
──────
hostname: clickhouse.eu-central1.internal
event_date: 2023-08-19
event_time_microseconds: 2023-08-19 11:05:21.998566
id: e5b74ecb-f6f1-426a-80be-872f90043885
name: Disk('backups_disk', '1.zip')
status: CREATING_BACKUP
error:
start_time: 2023-08-19 11:05:21
end_time: 1970-01-01 03:00:00
num_files: 0
total_size: 0
num_entries: 0
uncompressed_size: 0
compressed_size: 0
files_read: 0
bytes_read: 0
Row 2:
──────
hostname: clickhouse.eu-central1.internal
event_date: 2023-08-19
event_time: 2023-08-19 11:08:56
event_time_microseconds: 2023-08-19 11:08:56.916192
id: e5b74ecb-f6f1-426a-80be-872f90043885
name: Disk('backups_disk', '1.zip')
status: BACKUP_CREATED
error:
start_time: 2023-08-19 11:05:21
end_time: 2023-08-19 11:08:56
num_files: 57
total_size: 4290364870
num_entries: 46
uncompressed_size: 4290362365
compressed_size: 3525068304
files_read: 0
bytes_read: 0
RESTORE TABLE test_db.my_table FROM Disk('backups_disk', '1.zip')
┌─id───────────────────────────────────┬─status───┐
│ cdf1f731-52ef-42da-bc65-2e1bfcd4ce90 │ RESTORED │
└──────────────────────────────────────┴──────────┘
SELECT * FROM system.backup_log WHERE id = 'cdf1f731-52ef-42da-bc65-2e1bfcd4ce90' ORDER BY event_date, event_time_microseconds \G
Row 1:
──────
hostname: clickhouse.eu-central1.internal
event_date: 2023-08-19
event_time_microseconds: 2023-08-19 11:09:19.718077
id: cdf1f731-52ef-42da-bc65-2e1bfcd4ce90
name: Disk('backups_disk', '1.zip')
status: RESTORING
error:
start_time: 2023-08-19 11:09:19
end_time: 1970-01-01 03:00:00
num_files: 0
total_size: 0
num_entries: 0
uncompressed_size: 0
compressed_size: 0
files_read: 0
bytes_read: 0
Row 2:
──────
hostname: clickhouse.eu-central1.internal
event_date: 2023-08-19
event_time_microseconds: 2023-08-19 11:09:29.334234
id: cdf1f731-52ef-42da-bc65-2e1bfcd4ce90
name: Disk('backups_disk', '1.zip')
status: RESTORED
error:
start_time: 2023-08-19 11:09:19
end_time: 2023-08-19 11:09:29
num_files: 57
total_size: 4290364870
num_entries: 46
uncompressed_size: 4290362365
compressed_size: 4290362365
files_read: 57
bytes_read: 4290364870
system.backups:
SELECT * FROM system.backups ORDER BY start_time
┌─id───────────────────────────────────┬─name──────────────────────────┬─status─────────┬─error─┬──────────start_time─┬────────────end_time─┬─num_files─┬─total_size─┬─num_entries─┬─uncompressed_size─┬─compressed_size─┬─files_read─┬─bytes_read─┐
│ e5b74ecb-f6f1-426a-80be-872f90043885 │ Disk('backups_disk', '1.zip') │ BACKUP_CREATED │ │ 2023-08-19 11:05:21 │ 2023-08-19 11:08:56 │ 57 │ 4290364870 │ 46 │ 4290362365 │ 3525068304 │ 0 │ 0 │
│ cdf1f731-52ef-42da-bc65-2e1bfcd4ce90 │ Disk('backups_disk', '1.zip') │ RESTORED │ │ 2023-08-19 11:09:19 │ 2023-08-19 11:09:29 │ 57 │ 4290364870 │ 46 │ 4290362365 │ 4290362365 │ 57 │ 4290364870 │
└──────────────────────────────────────┴───────────────────────────────┴────────────────┴───────┴─────────────────────┴─────────────────────┴───────────┴────────────┴─────────────┴───────────────────┴─────────────────┴────────────┴────────────┘
See Also
Last modified on June 8, 2026
