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2.3 KiB
2.3 KiB
slug | machine_translated | machine_translated_rev |
---|---|---|
/zh/operations/system-tables/part_log | true | 5decc73b5d |
系统。part_log
该 system.part_log
表只有当创建 part_log 指定了服务器设置。
此表包含与以下情况发生的事件有关的信息 数据部分 在 MergeTree 家庭表,例如添加或合并数据。
该 system.part_log
表包含以下列:
event_type
(Enum) — Type of the event that occurred with the data part. Can have one of the following values:NEW_PART
— Inserting of a new data part.MERGE_PARTS
— Merging of data parts.DOWNLOAD_PART
— Downloading a data part.REMOVE_PART
— Removing or detaching a data part using DETACH PARTITION.MUTATE_PART
— Mutating of a data part.MOVE_PART
— Moving the data part from the one disk to another one.
event_date
(Date) — Event date.event_time
(DateTime) — Event time.duration_ms
(UInt64) — Duration.database
(String) — Name of the database the data part is in.table
(String) — Name of the table the data part is in.part_name
(String) — Name of the data part.partition_id
(String) — ID of the partition that the data part was inserted to. The column takes the ‘all’ 值,如果分区是由tuple()
.rows
(UInt64) — The number of rows in the data part.size_in_bytes
(UInt64) — Size of the data part in bytes.merged_from
(Array(String)) — An array of names of the parts which the current part was made up from (after the merge).bytes_uncompressed
(UInt64) — Size of uncompressed bytes.read_rows
(UInt64) — The number of rows was read during the merge.read_bytes
(UInt64) — The number of bytes was read during the merge.error
(UInt16) — The code number of the occurred error.exception
(String) — Text message of the occurred error.
该 system.part_log
表的第一个插入数据到后创建 MergeTree
桌子