mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-13 11:04:10 +00:00
15 lines
1.2 KiB
Markdown
15 lines
1.2 KiB
Markdown
|
# system.storage\_policies {#system_tables-storage_policies}
|
||
|
|
|
||
|
|
Contains information about storage policies and volumes defined in the [server configuration](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-multiple-volumes_configure).
|
||
|
|
|
||
|
|
Columns:
|
||
|
|
|
||
|
|
- `policy_name` ([String](../../sql-reference/data-types/string.md)) — Name of the storage policy.
|
||
|
|
- `volume_name` ([String](../../sql-reference/data-types/string.md)) — Volume name defined in the storage policy.
|
||
|
|
- `volume_priority` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Volume order number in the configuration.
|
||
|
|
- `disks` ([Array(String)](../../sql-reference/data-types/array.md)) — Disk names, defined in the storage policy.
|
||
|
|
- `max_data_part_size` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Maximum size of a data part that can be stored on volume disks (0 — no limit).
|
||
|
|
- `move_factor` ([Float64](../../sql-reference/data-types/float.md)) — Ratio of free disk space. When the ratio exceeds the value of configuration parameter, ClickHouse start to move data to the next volume in order.
|
||
|
|
|
||
|
|
If the storage policy contains more then one volume, then information for each volume is stored in the individual row of the table.
|