2020-06-18 08:24:31 +00:00
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# system.merges {#system-merges}
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Contains information about merges and part mutations currently in process for tables in the MergeTree family.
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Columns:
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- `database` (String) — The name of the database the table is in.
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- `table` (String) — Table name.
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- `elapsed` (Float64) — The time elapsed (in seconds) since the merge started.
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- `progress` (Float64) — The percentage of completed work from 0 to 1.
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- `num_parts` (UInt64) — The number of pieces to be merged.
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- `result_part_name` (String) — The name of the part that will be formed as the result of merging.
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2020-09-10 14:56:15 +00:00
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- `is_mutation` (UInt8) — 1 if this process is a part mutation.
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2020-06-18 08:24:31 +00:00
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- `total_size_bytes_compressed` (UInt64) — The total size of the compressed data in the merged chunks.
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- `total_size_marks` (UInt64) — The total number of marks in the merged parts.
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- `bytes_read_uncompressed` (UInt64) — Number of bytes read, uncompressed.
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- `rows_read` (UInt64) — Number of rows read.
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- `bytes_written_uncompressed` (UInt64) — Number of bytes written, uncompressed.
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- `rows_written` (UInt64) — Number of rows written.
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2020-09-10 14:56:15 +00:00
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- `memory_usage` (UInt64) — Memory consumption of the merge process.
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- `thread_id` (UInt64) — Thread ID of the merge process.
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- `merge_type` — The type of current merge. Empty if it's an mutation.
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- `merge_algorithm` — The algorithm used in current merge. Empty if it's an mutation.
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2020-08-06 08:50:29 +00:00
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[Original article](https://clickhouse.tech/docs/en/operations/system_tables/merges) <!--hide-->
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