limit_action.md

# 限制用户使用资源

Joe 需要限制数据分析组（role analysis）的用户, 每小时查询次数不能超过10000次。应该怎么操作？

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* `show databases;` 列出所有数据库
* `show tables;` 列出所有表

## 答案

```sql
alter user analysis with MAX_QUERIES_PER_HOUR 10000;
```

## 选项

### A

```sql
set user analysis with MAX_QUERIES_PER_HOUR 10000;
```


### B

```sql
alter role analysis with MAX_QUERIES_PER_HOUR 10000;
```

### C

```sql
alter role analysis with MAX_QUERIES_PER_HOUR=10000;
```

### D

```sql
alter user analysis set MAX_QUERIES_PER_HOUR 10000;
```