| ProfileEvents | Map(LowCardinality(String), UInt64) | 8.06 MiB | 94.89 MiB | 11.77 | 965.20 thousand | 103.09 | | All the profile events captured during this operation. |
| query_id | String | 4.78 MiB | 9.41 MiB | 1.97 | 965.20 thousand | 10.22 | | Identifier of the INSERT query that created this data part. |
| part_name | String | 3.07 MiB | 20.07 MiB | 6.54 | 965.20 thousand | 21.81 | | Name of the data part. |
| event_time_microseconds | DateTime64(6) | 2.11 MiB | 7.33 MiB | 3.47 | 965.20 thousand | 7.96 | | Event time with microseconds precision. |
| merged_from | Array(String) | 1.93 MiB | 23.96 MiB | 12.4 | 965.20 thousand | 26.03 | | An array of the source parts names which the current part was made up from. |
| path_on_disk | String | 1.77 MiB | 34.95 MiB | 19.77 | 965.20 thousand | 37.97 | | Absolute path to the folder with data part files. |
| bytes_uncompressed | UInt64 | 1.48 MiB | 7.33 MiB | 4.96 | 965.20 thousand | 7.96 | | Uncompressed size of the resulting part in bytes. |
| size_in_bytes | UInt64 | 1.45 MiB | 7.33 MiB | 5.04 | 965.20 thousand | 7.96 | | Size of the data part on disk in bytes. |
| rows | UInt64 | 1007.93 KiB | 7.33 MiB | 7.44 | 965.20 thousand | 7.96 | | The number of rows in the data part. |
| read_bytes | UInt64 | 583.64 KiB | 7.33 MiB | 12.85 | 965.20 thousand | 7.96 | | The number of bytes was read during the merge. |
| read_rows | UInt64 | 474.87 KiB | 7.33 MiB | 15.8 | 965.20 thousand | 7.96 | | The number of rows was read during the merge. |
| table | String | 417.34 KiB | 14.93 MiB | 36.63 | 965.20 thousand | 16.22 | | Name of the table the data part is in. |
| peak_memory_usage | UInt64 | 384.99 KiB | 7.33 MiB | 19.48 | 965.20 thousand | 7.96 | | The maximum amount of used during merge RAM |
| part_type | String | 359.83 KiB | 7.05 MiB | 20.07 | 965.20 thousand | 7.66 | | The type of the part. Possible values: Wide and Compact. |
| partition | String | 339.51 KiB | 7.00 MiB | 21.11 | 965.20 thousand | 7.6 | | The partition name. |
| table_uuid | UUID | 323.66 KiB | 14.65 MiB | 46.35 | 965.20 thousand | 15.92 | | UUID of the table the data part belongs to. |
| partition_id | String | 304.23 KiB | 5.47 MiB | 18.42 | 965.20 thousand | 5.95 | | ID of the partition that the data part was inserted to. The column takes the `all` value if the partitioning is by `tuple()`. |
| event_time | DateTime | 262.40 KiB | 3.66 MiB | 14.29 | 965.20 thousand | 3.98 | | Event time. |
| duration_ms | UInt64 | 256.47 KiB | 7.33 MiB | 29.25 | 965.20 thousand | 7.96 | | Duration of this operation. |
| disk_name | String | 252.18 KiB | 3.60 MiB | 14.63 | 965.20 thousand | 3.91 | | The disk name data part lies on. |
| event_type | Enum8('NewPart' = 1, 'MergeParts' = 2, 'DownloadPart' = 3, 'RemovePart' = 4, 'MutatePart' = 5, 'MovePart' = 6, 'MergePartsStart' = 7, 'MutatePartStart' = 8) | 121.50 KiB | 937.64 KiB | 7.72 | 965.20 thousand | 0.99 | | Type of the event that occurred with the data part. Can have one of the following values: NewPart — Inserting of a new data part, MergePartsStart — Merging of data parts has started, MergeParts — Merging of data parts has finished, DownloadPart — Downloading a data part, RemovePart — Removing or detaching a data part using [DETACH PARTITION](../../sql-reference/statements/alter/partition.md#alter_detach-partition).MutatePartStart — Mutating of a data part has started, MutatePart — Mutating of a data part has finished, MovePart — Moving the data part from the one disk to another one. |
| merge_reason | Enum8('NotAMerge' = 1, 'RegularMerge' = 2, 'TTLDeleteMerge' = 3, 'TTLRecompressMerge' = 4) | 118.48 KiB | 937.64 KiB | 7.91 | 965.20 thousand | 0.99 | | The reason for the event with type MERGE_PARTS. Can have one of the following values: NotAMerge — The current event has the type other than MERGE_PARTS, RegularMerge — Some regular merge, TTLDeleteMerge — Cleaning up expired data. TTLRecompressMerge — Recompressing data part with the. |
| merge_algorithm | Enum8('Undecided' = 0, 'Vertical' = 1, 'Horizontal' = 2) | 105.05 KiB | 937.64 KiB | 8.93 | 965.20 thousand | 0.99 | | Merge algorithm for the event with type MERGE_PARTS. Can have one of the following values: Undecided, Horizontal, Vertical |
| database | String | 9.37 KiB | 14.61 MiB | 1597.55 | 965.20 thousand | 15.87 | | Name of the database the data part is in. |
| event_date | Date | 1.61 KiB | 1.83 MiB | 1165.23 | 965.20 thousand | 1.99 | | Event date. |
| hostname | LowCardinality(String) | 1.42 KiB | 939.73 KiB | 663.18 | 965.20 thousand | 1 | | Hostname of the server executing the query. |
| exception | String | 362.00 B | 1.11 KiB | 3.13 | 965.20 thousand | 0 | | Text message of the occurred error. |
| error | UInt16 | 362.00 B | 1.11 KiB | 3.13 | 965.20 thousand | 0 | | The error code of the occurred exception. |
