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# 系统。合并 {#system-merges}

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.