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？

<hr/>

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

## 答案

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

## 选项

### A

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


### B

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

### C

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

### D

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