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系统。storage_policies
包含有关存储策略和卷中定义的信息 服务器配置.
列:
policy_name
(字符串) — Name of the storage policy.volume_name
(字符串) — Volume name defined in the storage policy.volume_priority
(UInt64) — Volume order number in the configuration.disks
(数组(字符串)) — Disk names, defined in the storage policy.max_data_part_size
(UInt64) — Maximum size of a data part that can be stored on volume disks (0 — no limit).move_factor
(Float64) — 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.
如果存储策略包含多个卷,则每个卷的信息将存储在表的单独行中。