2020-06-18 08:24:31 +00:00
|
|
|
# system.merges {#system-merges}
|
|
|
|
|
|
|
|
|
|
Contains information about merges and part mutations currently in process for tables in the MergeTree family.
|
|
|
|
|
|
|
|
|
|
Columns:
|
|
|
|
|
|
|
|
|
|
- `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.
|
2020-09-10 14:56:15 +00:00
|
|
|
- `is_mutation` (UInt8) — 1 if this process is a part mutation.
|
2020-06-18 08:24:31 +00:00
|
|
|
- `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.
|
2020-09-10 14:56:15 +00:00
|
|
|
- `memory_usage` (UInt64) — Memory consumption of the merge process.
|
|
|
|
|
- `thread_id` (UInt64) — Thread ID of the merge process.
|
|
|
|
|
- `merge_type` — The type of current merge. Empty if it's an mutation.
|
|
|
|
|
- `merge_algorithm` — The algorithm used in current merge. Empty if it's an mutation.
|
2020-08-06 08:50:29 +00:00
|
|
|
|
2021-06-24 12:47:02 +00:00
|
|
|
[Original article](https://clickhouse.tech/docs/en/operations/system-tables/merges) <!--hide-->
|
