ClickHouse/docs/en/operations/system-tables/replicated_fetches.md

Ignoring revisions in .git-blame-ignore-revs. Click here to bypass and see the normal blame view.

72 lines
3.3 KiB
Markdown
Raw Normal View History

2022-08-28 13:53:52 +00:00
---
2022-08-28 13:58:27 +00:00
slug: /en/operations/system-tables/replicated_fetches
2022-08-28 13:53:52 +00:00
---
2022-06-02 10:55:18 +00:00
# replicated_fetches
Contains information about currently running background fetches.
Columns:
- `database` ([String](../../sql-reference/data-types/string.md)) — Name of the database.
- `table` ([String](../../sql-reference/data-types/string.md)) — Name of the table.
- `elapsed` ([Float64](../../sql-reference/data-types/float.md)) — The time elapsed (in seconds) since showing currently running background fetches started.
- `progress` ([Float64](../../sql-reference/data-types/float.md)) — The percentage of completed work from 0 to 1.
- `result_part_name` ([String](../../sql-reference/data-types/string.md)) — The name of the part that will be formed as the result of showing currently running background fetches.
- `result_part_path` ([String](../../sql-reference/data-types/string.md)) — Absolute path to the part that will be formed as the result of showing currently running background fetches.
- `partition_id` ([String](../../sql-reference/data-types/string.md)) — ID of the partition.
- `total_size_bytes_compressed` ([UInt64](../../sql-reference/data-types/int-uint.md)) — The total size (in bytes) of the compressed data in the result part.
- `bytes_read_compressed` ([UInt64](../../sql-reference/data-types/int-uint.md)) — The number of compressed bytes read from the result part.
- `source_replica_path` ([String](../../sql-reference/data-types/string.md)) — Absolute path to the source replica.
- `source_replica_hostname` ([String](../../sql-reference/data-types/string.md)) — Hostname of the source replica.
- `source_replica_port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — Port number of the source replica.
- `interserver_scheme` ([String](../../sql-reference/data-types/string.md)) — Name of the interserver scheme.
- `URI` ([String](../../sql-reference/data-types/string.md)) — Uniform resource identifier.
- `to_detached` ([UInt8](../../sql-reference/data-types/int-uint.md)) — The flag indicates whether the currently running background fetch is being performed using the `TO DETACHED` expression.
- `thread_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Thread identifier.
**Example**
``` sql
SELECT * FROM system.replicated_fetches LIMIT 1 FORMAT Vertical;
```
``` text
Row 1:
──────
database: default
table: t
elapsed: 7.243039876
progress: 0.41832135995612835
result_part_name: all_0_0_0
result_part_path: /var/lib/clickhouse/store/700/70080a04-b2de-4adf-9fa5-9ea210e81766/all_0_0_0/
partition_id: all
total_size_bytes_compressed: 1052783726
bytes_read_compressed: 440401920
source_replica_path: /clickhouse/test/t/replicas/1
source_replica_hostname: node1
source_replica_port: 9009
interserver_scheme: http
URI: http://node1:9009/?endpoint=DataPartsExchange%3A%2Fclickhouse%2Ftest%2Ft%2Freplicas%2F1&part=all_0_0_0&client_protocol_version=4&compress=false
to_detached: 0
thread_id: 54
```
**See Also**
- [Managing ReplicatedMergeTree Tables](../../sql-reference/statements/system.md/#managing-replicatedmergetree-tables)