Each row describes one data part.
YYYYMMfor automatic partitioning by month.
any_stringwhen partitioning manually.
name (String) – Name of the data part.
part_type (String) — The data part storing format.
Wide— Each column is stored in a separate file in a filesystem.
Compact— All columns are stored in one file in a filesystem.
Data storing format is controlled by the
min_rows_for_wide_part settings of the MergeTree table.
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.
marks (UInt64) – The number of marks. To get the approximate number of rows in a data part, multiply
marks by the index granularity (usually 8192) (this hint doesn’t work for adaptive granularity).
rows (UInt64) – The number of rows.
bytes_on_disk (UInt64) – Total size of all the data part files in bytes.
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.
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.
marks_bytes (UInt64) – The size of the file with marks.
modification_time (DateTime) – The time the directory with the data part was modified. This usually corresponds to the time of data part creation.
remove_time (DateTime) – The time when the data part became inactive.
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.
min_date (Date) – The minimum value of the date key in the data part.
max_date (Date) – The maximum value of the date key in the data part.
min_time (DateTime) – The minimum value of the date and time key in the data part.
max_time(DateTime) – The maximum value of the date and time key in the data part.
partition_id (String) – ID of the partition.
min_block_number (UInt64) – The minimum number of data parts that make up the current part after merging.
max_block_number (UInt64) – The maximum number of data parts that make up the current part after merging.
level (UInt32) – Depth of the merge tree. Zero means that the current part was created by insert rather than by merging other parts.
data_version (UInt64) – Number that is used to determine which mutations should be applied to the data part (mutations with a version higher than
primary_key_bytes_in_memory (UInt64) – The amount of memory (in bytes) used by primary key values.
primary_key_bytes_in_memory_allocated (UInt64) – The amount of memory (in bytes) reserved for primary key values.
database (String) – Name of the database.
table (String) – Name of the table.
engine (String) – Name of the table engine without parameters.
path (String) – Absolute path to the folder with data part files.
disk (String) – Name of a disk that stores the data part.
move_ttl_info.expression array is kept mostly for backward compatibility, now the simpliest way to check
TTL MOVE rule is to use the
bytes (UInt64) – Alias for
marks_size (UInt64) – Alias for
SELECT * FROM system.parts LIMIT 1 FORMAT Vertical;
Row 1: ────── partition: tuple() name: all_1_4_1_6 part_type: Wide active: 1 marks: 2 rows: 6 bytes_on_disk: 310 data_compressed_bytes: 157 data_uncompressed_bytes: 91 marks_bytes: 144 modification_time: 2020-06-18 13:01:49 remove_time: 1970-01-01 00:00:00 refcount: 1 min_date: 1970-01-01 max_date: 1970-01-01 min_time: 1970-01-01 00:00:00 max_time: 1970-01-01 00:00:00 partition_id: all min_block_number: 1 max_block_number: 4 level: 1 data_version: 6 primary_key_bytes_in_memory: 8 primary_key_bytes_in_memory_allocated: 64 is_frozen: 0 database: default table: months engine: MergeTree disk_name: default path: /var/lib/clickhouse/data/default/months/all_1_4_1_6/ hash_of_all_files: 2d0657a16d9430824d35e327fcbd87bf hash_of_uncompressed_files: 84950cc30ba867c77a408ae21332ba29 uncompressed_hash_of_compressed_files: 1ad78f1c6843bbfb99a2c931abe7df7d delete_ttl_info_min: 1970-01-01 00:00:00 delete_ttl_info_max: 1970-01-01 00:00:00 move_ttl_info.expression:  move_ttl_info.min:  move_ttl_info.max: 
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