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druid sql part-17

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liujianhuan 2020-06-29 19:23:05 +08:00
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Configuration/core-ext/druid-basic-security.md Normal file
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Querying/druidsql.md
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**SERVERS表** **SERVERS表**
Servers表列出集群中发现的所有服务器 Servers表列出集群中发现的所有服务器
| 字段 | 类型 | 注意 | | 字段 | 类型 | 注意 |
|-|-|-| |-|-|-|
| `server` | STRING | 服务名称，格式为host:port | | `server` | STRING | 服务名称，格式为host:port |
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SELECT * FROM sys.servers; SELECT * FROM sys.servers;
``` ```
**SERVER_SEGMENTS表**
SERVER_SEGMENTS表用来连接服务与段表
| 字段 | 类型 | 注意 |
|-|-|-|
| `server` | STRING | 格式为host:port的服务名称， [SERVER表](#SERVERS表) 的主键 |
| `segment_id` | STRING | 段标识符，[SEGMENTS表](#SEGMENTS表) 的主键 |
"SERVERS"和"SEGMENTS"之间的联接可用于查询特定数据源的段数，按SERVER分组，示例查询：
```sql
SELECT count(segments.segment_id) as num_segments from sys.segments as segments
INNER JOIN sys.server_segments as server_segments
ON segments.segment_id = server_segments.segment_id
INNER JOIN sys.servers as servers
ON servers.server = server_segments.server
WHERE segments.datasource = 'wikipedia'
GROUP BY servers.server;
```
**TASKS表**
**SUPERVISORS表**
### 服务配置 ### 服务配置
Druid SQL计划发生在Broker上，由 [Broker runtime properties](../Configuration/configuration.md#broker) 配置。
### 安全性 ### 安全性
有关进行SQL查询需要哪些权限的信息，请参阅基本安全文档中的 [定义SQL权限](../Configuration/core-ext/druid-basic-security.md) 。