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# system.parts {#system_tables-parts}
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# 系统。零件 {#system_tables-parts}
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此系统表包含 [MergeTree](../../engines/table-engines/mergetree-family/mergetree.md) 表分区的相关信息。
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包含有关的部分信息 [MergeTree](../../engines/table-engines/mergetree-family/mergetree.md) 桌子
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每一行描述一个数据分区。
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每行描述一个数据部分。
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列:
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列:
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- `partition` (String) – The partition name. To learn what a partition is, see the description of the [ALTER](../../sql-reference/statements/alter.md#query_language_queries_alter) 查询。
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- `partition` ([String](../../sql-reference/data-types/string.md)) – 分区名称。请参阅 [ALTER](../../sql-reference/statements/alter/index.md#query_language_queries_alter) 查询的说明，来了解什么是分区。
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格式:
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格式:
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- `YYYYMM` 用于按月自动分区。
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- `YYYYMM` 用于按月自动分区。
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- `any_string` 手动分区时。
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- `any_string` 手动分区时，是其他格式的字符串。
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- `name` (`String`) – Name of the data part.
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- `name` ([String](../../sql-reference/data-types/string.md)) – 数据分区的名称。
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- `active` (`UInt8`) – Flag that indicates whether the data part is active. If a data part is active, it's used in a table. Otherwise, it's deleted. Inactive data parts remain after merging.
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- `part_type` ([String](../../sql-reference/data-types/string.md)) — 数据分区的存储格式。
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- `marks` (`UInt64`) – The number of marks. To get the approximate number of rows in a data part, multiply `marks` 通过索引粒度（通常为8192）（此提示不适用于自适应粒度）。
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可能的值:
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- `rows` (`UInt64`) – The number of rows.
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- `Wide` — 每一列在文件系统中的一个单独文件中存储。
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- `Compact` — 所有列在文件系统中的一个文件中存储。
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- `bytes_on_disk` (`UInt64`) – Total size of all the data part files in bytes.
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数据存储格式由 [MergeTree](../../engines/table-engines/mergetree-family/mergetree.md) 表的 `min_bytes_for_wide_part` 和 `min_rows_for_wide_part` 控制。
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- `data_compressed_bytes` (`UInt64`) – Total size of compressed data in the data part. All the auxiliary files (for example, files with marks) are not included.
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- `active` ([UInt8](../../sql-reference/data-types/int-uint.md)) – 指示数据分区是否处于活动状态的标志。如果数据分区处于活动状态，则此数据正在被表使用。反之，则不活跃(deleted)。合并后仍会保留非活跃的数据分区。
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- `data_uncompressed_bytes` (`UInt64`) – Total size of uncompressed data in the data part. All the auxiliary files (for example, files with marks) are not included.
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- `marks` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 标记数。要获得数据分区中的大致行数：使用`marks`(标记数)乘以索引粒度(通常为 8192)。不适用于自适应颗粒度。
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- `marks_bytes` (`UInt64`) – The size of the file with marks.
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- `rows` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 行数.
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- `modification_time` (`DateTime`) – The time the directory with the data part was modified. This usually corresponds to the time of data part creation.\|
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- `bytes_on_disk` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 数据总大小（以字节为单位）。
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- `remove_time` (`DateTime`) – The time when the data part became inactive.
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- `data_compressed_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 数据分区中压缩数据的总大小。不包括所有辅助文件（例如，带有标记的文件）。
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- `refcount` (`UInt32`) – The number of places where the data part is used. A value greater than 2 indicates that the data part is used in queries or merges.
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- `data_uncompressed_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 数据分区中未压缩数据的总大小。不包括所有辅助文件（例如，带有标记的文件）。
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- `min_date` (`Date`) – The minimum value of the date key in the data part.
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- `marks_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 带有标记的文件的大小。
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- `max_date` (`Date`) – The maximum value of the date key in the data part.
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- `secondary_indices_compressed_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 数据分区中二级索引的压缩数据总大小。所有的辅助文件（例如，带有标记的文件）都不包括在内。
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- `min_time` (`DateTime`) – The minimum value of the date and time key in the data part.
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- `secondary_indices_uncompressed_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 数据分区中二级索引的未压缩数据的总大小。所有的辅助文件（例如，带有标记的文件）都不包括在内。
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- `max_time`(`DateTime`) – The maximum value of the date and time key in the data part.
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- `secondary_indices_marks_bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 带标记的二级索引的文件大小。
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- `partition_id` (`String`) – ID of the partition.
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- `modification_time` ([DateTime](../../sql-reference/data-types/datetime.md)) – 包含数据分区的目录被修改的时间。这通常对应于数据部分创建的时间。
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- `min_block_number` (`UInt64`) – The minimum number of data parts that make up the current part after merging.
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- `remove_time` ([DateTime](../../sql-reference/data-types/datetime.md)) – 数据分区变为非活动状态的时间。
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- `max_block_number` (`UInt64`) – The maximum number of data parts that make up the current part after merging.
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- `refcount` ([UInt32](../../sql-reference/data-types/int-uint.md)) – 使用数据部分的位置数。大于 2 的值表示数据部分用于查询或是用于合并。
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- `level` (`UInt32`) – Depth of the merge tree. Zero means that the current part was created by insert rather than by merging other parts.
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- `min_date` ([Date](../../sql-reference/data-types/date.md)) – 数据部分中日期键的最小值。
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- `data_version` (`UInt64`) – Number that is used to determine which mutations should be applied to the data part (mutations with a version higher than `data_version`).
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- `max_date` ([Date](../../sql-reference/data-types/date.md)) – 数据部分中日期键的最大值。
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- `primary_key_bytes_in_memory` (`UInt64`) – The amount of memory (in bytes) used by primary key values.
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- `min_time` ([DateTime](../../sql-reference/data-types/datetime.md)) – 数据部分中日期和时间键的最小值。
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- `primary_key_bytes_in_memory_allocated` (`UInt64`) – The amount of memory (in bytes) reserved for primary key values.
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- `max_time`([DateTime](../../sql-reference/data-types/datetime.md)) – 数据部分中日期和时间键的最大值。
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- `is_frozen` (`UInt8`) – Flag that shows that a partition data backup exists. 1, the backup exists. 0, the backup doesn't exist. For more details, see [FREEZE PARTITION](../../sql-reference/statements/alter.md#alter_freeze-partition)
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- `partition_id` ([String](../../sql-reference/data-types/string.md)) – 分区的 ID。
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- `database` (`String`) – Name of the database.
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- `min_block_number` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 合并后构成当前部分的最小数据部分数量。
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- `table` (`String`) – Name of the table.
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- `max_block_number` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 合并后构成当前部分的最大数据部分数量。
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- `engine` (`String`) – Name of the table engine without parameters.
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- `level` ([UInt32](../../sql-reference/data-types/int-uint.md)) – 合并树的深度。值为 0 表示该分区是通过插入创建的，而不是通过合并创建的。
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- `path` (`String`) – Absolute path to the folder with data part files.
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- `data_version` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 用于确定应将哪些订正(mutations)应用于数据部分（版本高于 `data_version` 的订正(mutations)）的数字。
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- `disk` (`String`) – Name of a disk that stores the data part.
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- `primary_key_bytes_in_memory` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 主键值使用的内存量（以字节为单位）。
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- `hash_of_all_files` (`String`) – [sipHash128](../../sql-reference/functions/hash-functions.md#hash_functions-siphash128) 的压缩文件。
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- `primary_key_bytes_in_memory_allocated` ([UInt64](../../sql-reference/data-types/int-uint.md)) – 为主键值保留的内存量（以字节为单位）。
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- `hash_of_uncompressed_files` (`String`) – [sipHash128](../../sql-reference/functions/hash-functions.md#hash_functions-siphash128) 未压缩的文件（带标记的文件，索引文件等。).
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- `is_frozen` ([UInt8](../../sql-reference/data-types/int-uint.md)) – 显示分区数据备份存在的标志。1，备份存在。0，备份不存在。更多细节，见 [FREEZE PARTITION](../../sql-reference/statements/alter/partition.md#alter_freeze-partition)。
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- `uncompressed_hash_of_compressed_files` (`String`) – [sipHash128](../../sql-reference/functions/hash-functions.md#hash_functions-siphash128) 压缩文件中的数据，就好像它们是未压缩的。
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- `database` ([String](../../sql-reference/data-types/string.md)) – 数据库的名称。
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- `bytes` (`UInt64`) – Alias for `bytes_on_disk`.
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- `table` ([String](../../sql-reference/data-types/string.md)) – 表的名称。
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- `marks_size` (`UInt64`) – Alias for `marks_bytes`.
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- `engine` ([String](../../sql-reference/data-types/string.md)) – 不带参数的表引擎名称。
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- `path` ([String](../../sql-reference/data-types/string.md)) – 包含数据部分文件的文件夹的绝对路径。
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- `disk` ([String](../../sql-reference/data-types/string.md)) – 存储数据部分的磁盘的名称。
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- `hash_of_all_files` ([String](../../sql-reference/data-types/string.md)) – 压缩文件的 [sipHash128](../../sql-reference/functions/hash-functions.md#hash_functions-siphash128)。
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- `hash_of_uncompressed_files` ([String](../../sql-reference/data-types/string.md)) – 未压缩文件(带有标记的文件、索引文件等)的 [sipHash128](../../sql-reference/functions/hash-functions.md#hash_functions-siphash128)。
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- `uncompressed_hash_of_compressed_files` ([String](../../sql-reference/data-types/string.md)) – 压缩文件中的数据(没有压缩时)的 [sipHash128](../../sql-reference/functions/hash-functions.md#hash_functions-siphash128)。
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- `delete_ttl_info_min` ([DateTime](../../sql-reference/data-types/datetime.md)) — [TTL DELETE 规则](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl) 的日期和时间键的最小值。
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- `delete_ttl_info_max` ([DateTime](../../sql-reference/data-types/datetime.md)) — [TTL DELETE 规则](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl) 的日期和时间键的最大值。
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- `move_ttl_info.expression` ([Array](../../sql-reference/data-types/array.md)([String](../../sql-reference/data-types/string.md))) — 表达式的数组。 每个表达式定义一个 [TTL MOVE 规则](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl).
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!!! note "警告"
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保留 `move_ttl_info.expression` 数组主要是为了向后兼容，现在检查 `TTL MOVE` 规则最简单的方法是使用 `move_ttl_info.min` 和 `move_ttl_info.max` 字段。
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- `move_ttl_info.min` ([Array](../../sql-reference/data-types/array.md)([DateTime](../../sql-reference/data-types/datetime.md))) — 日期值和时间值的数组。数组中的每个元素都描述了一个 [TTL MOVE rule](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl) 的最小键值。
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- `move_ttl_info.max` ([Array](../../sql-reference/data-types/array.md)([DateTime](../../sql-reference/data-types/datetime.md))) — 日期值和时间值的数组。数组中的每个元素都描述了一个 [TTL MOVE rule](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl) 的最大键值。
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- `bytes` ([UInt64](../../sql-reference/data-types/int-uint.md)) – `bytes_on_disk`的别名。
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- `marks_size` ([UInt64](../../sql-reference/data-types/int-uint.md)) – `marks_bytes`的别名。
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**示例**
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``` sql
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SELECT * FROM system.parts LIMIT 1 FORMAT Vertical;
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```
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``` text
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Row 1:
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──────
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partition: tuple()
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name: all_1_4_1_6
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part_type: Wide
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active: 1
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marks: 2
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rows: 6
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bytes_on_disk: 310
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data_compressed_bytes: 157
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data_uncompressed_bytes: 91
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secondary_indices_compressed_bytes: 58
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secondary_indices_uncompressed_bytes: 6
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secondary_indices_marks_bytes: 48
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marks_bytes: 144
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modification_time: 2020-06-18 13:01:49
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remove_time: 1970-01-01 00:00:00
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refcount: 1
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min_date: 1970-01-01
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max_date: 1970-01-01
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min_time: 1970-01-01 00:00:00
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max_time: 1970-01-01 00:00:00
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partition_id: all
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min_block_number: 1
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max_block_number: 4
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level: 1
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data_version: 6
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primary_key_bytes_in_memory: 8
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primary_key_bytes_in_memory_allocated: 64
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is_frozen: 0
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database: default
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table: months
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engine: MergeTree
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disk_name: default
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path: /var/lib/clickhouse/data/default/months/all_1_4_1_6/
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hash_of_all_files: 2d0657a16d9430824d35e327fcbd87bf
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hash_of_uncompressed_files: 84950cc30ba867c77a408ae21332ba29
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uncompressed_hash_of_compressed_files: 1ad78f1c6843bbfb99a2c931abe7df7d
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delete_ttl_info_min: 1970-01-01 00:00:00
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delete_ttl_info_max: 1970-01-01 00:00:00
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move_ttl_info.expression: []
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move_ttl_info.min: []
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move_ttl_info.max: []
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```
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**另请参阅**
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- [MergeTree(合并树)家族](../../engines/table-engines/mergetree-family/mergetree.md)
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- [列和表的 TTL](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl)
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[原文](https://clickhouse.com/docs/zh/operations/system-tables/parts) <!--hide-->
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