ClickHouse/docs/zh/operations/system-tables/merges.md

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系统。合并

包含有关MergeTree系列中表当前正在进行的合并和部件突变的信息。

列:

• database (String) — The name of the database the table is in.
• table (String) — Table name.
• elapsed (Float64) — The time elapsed (in seconds) since the merge started.
• progress (Float64) — The percentage of completed work from 0 to 1.
• num_parts (UInt64) — The number of pieces to be merged.
• result_part_name (String) — The name of the part that will be formed as the result of merging.
• is_mutation (UInt8)-1如果这个过程是一个部分突变.
• total_size_bytes_compressed (UInt64) — The total size of the compressed data in the merged chunks.
• total_size_marks (UInt64) — The total number of marks in the merged parts.
• bytes_read_uncompressed (UInt64) — Number of bytes read, uncompressed.
• rows_read (UInt64) — Number of rows read.
• bytes_written_uncompressed (UInt64) — Number of bytes written, uncompressed.
• rows_written (UInt64) — Number of rows written.