2022-08-26 19:07:59 +00:00
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---
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slug: /zh/operations/system-tables/replicated_fetches
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---
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2021-10-27 06:28:42 +00:00
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# system.replicated_fetches {#system_tables-replicated_fetches}
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包含当前正在运行的后台提取的信息.
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列信息:
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- `database` ([String](../../sql-reference/data-types/string.md)) — 数据库名称.
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- `table` ([String](../../sql-reference/data-types/string.md)) — 表名称.
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- `elapsed` ([Float64](../../sql-reference/data-types/float.md)) — 显示当前正在运行的后台提取开始以来经过的时间(以秒为单位).
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- `progress` ([Float64](../../sql-reference/data-types/float.md)) — 完成工作的百分比从0到1.
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- `result_part_name` ([String](../../sql-reference/data-types/string.md)) — 显示当前正在运行的后台提取的结果而形成的部分的名称.
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- `result_part_path` ([String](../../sql-reference/data-types/string.md)) — 显示当前正在运行的后台提取的结果而形成的部分的绝对路径.
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- `partition_id` ([String](../../sql-reference/data-types/string.md)) — 分区 ID.
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- `total_size_bytes_compressed` ([UInt64](../../sql-reference/data-types/int-uint.md)) — 结果部分中压缩数据的总大小(以字节为单位).
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- `bytes_read_compressed` ([UInt64](../../sql-reference/data-types/int-uint.md)) — 从结果部分读取的压缩字节数.
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- `source_replica_path` ([String](../../sql-reference/data-types/string.md)) — 源副本的绝对路径.
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- `source_replica_hostname` ([String](../../sql-reference/data-types/string.md)) — 源副本的主机名称.
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- `source_replica_port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — 源副本的端口号.
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- `interserver_scheme` ([String](../../sql-reference/data-types/string.md)) — Name of the interserver scheme.
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- `URI` ([String](../../sql-reference/data-types/string.md)) — 统一资源标识符.
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- `to_detached` ([UInt8](../../sql-reference/data-types/int-uint.md)) — 该标志指示是否正在使用 `TO DETACHED` 表达式执行当前正在运行的后台提取.
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- `thread_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — 线程标识符.
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**示例**
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``` sql
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SELECT * FROM system.replicated_fetches LIMIT 1 FORMAT Vertical;
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```
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``` text
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Row 1:
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──────
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database: default
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table: t
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elapsed: 7.243039876
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progress: 0.41832135995612835
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result_part_name: all_0_0_0
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result_part_path: /var/lib/clickhouse/store/700/70080a04-b2de-4adf-9fa5-9ea210e81766/all_0_0_0/
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partition_id: all
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total_size_bytes_compressed: 1052783726
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bytes_read_compressed: 440401920
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source_replica_path: /clickhouse/test/t/replicas/1
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source_replica_hostname: node1
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source_replica_port: 9009
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interserver_scheme: http
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URI: http://node1:9009/?endpoint=DataPartsExchange%3A%2Fclickhouse%2Ftest%2Ft%2Freplicas%2F1&part=all_0_0_0&client_protocol_version=4&compress=false
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to_detached: 0
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thread_id: 54
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```
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**另请参阅**
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2021-10-27 06:49:57 +00:00
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- [管理 ReplicatedMergeTree 表](../../sql-reference/statements/system/#query-language-system-replicated)
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