set mykey \
\
在使用 Unix CLI 工具时，请确保使用 \r\n 作为换行符。例如\
printf "set mykey 0 60 4\r\ndata\r\n" |
| add | 添加新密钥 | `add newkey 0 60 5` |
| replace | 覆盖现有密钥 | `replace key 0 60 5` |
| append | 将数据附加到现有密钥 | `append key 0 60 15` |
| prepend | 将数据前置到现有密钥 | `prepend key 0 60 15` |
| incr | 将给定数字加到密钥值上 | `incr mykey 2` |
| decr | 将给定数字减去密钥值 | `decr mykey 5` |
| delete | 删除现有密钥 | `delete mykey` |
| flush\_all | 立即使所有项目无效 | `flush_all` |
| flush\_all | 在 n 秒内使所有项目无效 | `flush_all 900` |
| stats | 打印一般统计信息 | `stats` |
| | 打印内存统计信息 | `stats slabs` |
| | 打印更高级别的分配统计信息 | `stats malloc` |
| | 打印项目信息 | `stats items` |
| | | `stats detail` |
| | | `stats sizes` |
| | 重置统计计数器 | `stats reset` |
| lru\_crawler metadump | 转储缓存中所有项目的（大部分）元数据 | `lru_crawler metadump all` |
| version | 打印服务器版本。 | `version` |
| verbosity | 增加日志级别 | `verbosity` |
| quit | 终止会话 | `quit` |
#### 流量统计
您可以使用以下命令查询当前流量统计信息
```
stats
```
您将获得一个列出连接数、收发字节数等信息的清单。
示例输出：
```
STAT pid 14868
STAT uptime 175931
STAT time 1220540125
STAT version 1.2.2
STAT pointer_size 32
STAT rusage_user 620.299700
STAT rusage_system 1545.703017
STAT curr_items 228
STAT total_items 779
STAT bytes 15525
STAT curr_connections 92
STAT total_connections 1740
STAT connection_structures 165
STAT cmd_get 7411
STAT cmd_set 28445156
STAT get_hits 5183
STAT get_misses 2228
STAT evictions 0
STAT bytes_read 2112768087
STAT bytes_written 1000038245
STAT limit_maxbytes 52428800
STAT threads 1
END
```
#### 内存统计
您可以使用以下命令查询当前内存统计信息
```
stats slabs
```
````markdown
## Memcache Commands
### Stats Command
The `stats` command is used to retrieve general statistics about the Memcached server. This command can provide information such as total number of connections, memory usage, hit and miss ratio, and more.
To use the `stats` command, you can simply run:
```bash
stats
````
This will return a list of statistics that can help you analyze the performance and usage of the Memcached server.
### Set Command
The `set` command is used to store a new key with some data on the Memcached server. This command requires the key, flags, expiration time, and the length of data in bytes.
To use the `set` command, you can run:
```bash
set mykey 0 3600 5
hello
```
In this example, we are setting a key `mykey` with a value of `hello` that expires in 3600 seconds.
### Get Command
The `get` command is used to retrieve the data stored with a specific key on the Memcached server.
To use the `get` command, you can run:
```bash
get mykey
```
This will return the value associated with the key `mykey`, if it exists in the Memcached server.
```
```
STAT 1:chunk\_size 80 STAT 1:chunks\_per\_page 13107 STAT 1:total\_pages 1 STAT 1:total\_chunks 13107 STAT 1:used\_chunks 13106 STAT 1:free\_chunks 1 STAT 1:free\_chunks\_end 12886 STAT 2:chunk\_size 100 STAT 2:chunks\_per\_page 10485 STAT 2:total\_pages 1 STAT 2:total\_chunks 10485 STAT 2:used\_chunks 10484 STAT 2:free\_chunks 1 STAT 2:free\_chunks\_end 10477 \[...] STAT active\_slabs 3 STAT total\_malloced 3145436 END
```
如果您不确定您的memcached实例是否有足够的内存，请始终关注“stats”命令提供的“evictions”计数器。如果实例有足够的内存，“evictions”计数器应为0，或者至少不会增加。
#### 使用了哪些键？
没有内置函数可以直接确定当前的键集。但是您可以使用
```
stats items
```
### Command to determine how many keys do exist.
查询存在多少个键的命令。
```
stats items STAT items:1:number 220 STAT items:1:age 83095 STAT items:2:number 7 STAT items:2:age 1405 \[...] END
```
这至少有助于查看是否使用了任何键。要从已经执行memcache访问的PHP脚本中转储键名称，您可以使用来自[100days.de](http://100days.de/serendipity/archives/55-Dumping-MemcacheD-Content-Keys-with-PHP.html)的PHP代码。
