ClickHouse/docs/zh/operations/utilities/clickhouse-local.md
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60 clickhouse-local

ツ环板-ョツ嘉ッツ偲

clickhouse-local 程序使您能够对本地文件执行快速处理而无需部署和配置ClickHouse服务器。

接受表示表的数据并使用以下方式查询它们 ツ环板ECTョツ嘉ッツ偲.

clickhouse-local 使用与ClickHouse server相同的核心因此它支持大多数功能以及相同的格式和表引擎。

默认情况下 clickhouse-local 不能访问同一主机上的数据,但它支持使用以下方式加载服务器配置 --config-file 争论。

!!! warning "警告" 不建议将生产服务器配置加载到 clickhouse-local 因为数据可以在人为错误的情况下被损坏。

用途

基本用法:

clickhouse-local --structure "table_structure" --input-format "format_of_incoming_data" -q "query"

参数:

  • -S, --structure — table structure for input data.
  • -if, --input-format — input format, TSV 默认情况下。
  • -f, --file — path to data, stdin 默认情况下。
  • -q --query — queries to execute with ; 如delimeter。
  • -N, --table — table name where to put output data, table 默认情况下。
  • -of, --format, --output-format — output format, TSV 默认情况下。
  • --stacktrace — whether to dump debug output in case of exception.
  • --verbose — more details on query execution.
  • -s — disables stderr 记录。
  • --config-file — path to configuration file in same format as for ClickHouse server, by default the configuration empty.
  • --help — arguments references for clickhouse-local.

还有每个ClickHouse配置变量的参数这些变量更常用而不是 --config-file.

echo -e "1,2\n3,4" | clickhouse-local -S "a Int64, b Int64" -if "CSV" -q "SELECT * FROM table"
Read 2 rows, 32.00 B in 0.000 sec., 5182 rows/sec., 80.97 KiB/sec.
1 2
3 4

前面的例子是一样的:

$ echo -e "1,2\n3,4" | clickhouse-local -q "CREATE TABLE table (a Int64, b Int64) ENGINE = File(CSV, stdin); SELECT a, b FROM table; DROP TABLE table"
Read 2 rows, 32.00 B in 0.000 sec., 4987 rows/sec., 77.93 KiB/sec.
1 2
3 4

现在让我们为每个Unix用户输出内存用户:

$ ps aux | tail -n +2 | awk '{ printf("%s\t%s\n", $1, $4) }' | clickhouse-local -S "user String, mem Float64" -q "SELECT user, round(sum(mem), 2) as memTotal FROM table GROUP BY user ORDER BY memTotal DESC FORMAT Pretty"
Read 186 rows, 4.15 KiB in 0.035 sec., 5302 rows/sec., 118.34 KiB/sec.
┏━━━━━━━━━━┳━━━━━━━━━━┓
┃ user     ┃ memTotal ┃
┡━━━━━━━━━━╇━━━━━━━━━━┩
│ bayonet  │    113.5 │
├──────────┼──────────┤
│ root     │      8.8 │
├──────────┼──────────┤
...

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