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系统。part_log

该 表只有当创建 指定了服务器设置。

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.
• (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.
• rows (UInt64) — The number of rows in the data part.
• (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.
• exception (String) — Text message of the occurred error.