Introduction, installation, command of memcached

I. Overview of memcached

Memcache (memory, Cache): A high-performance distributed Memory object caching system. By maintaining a huge hash table in memory. (Key=value)

Hash table

Key (Keys)	Value (values)
Var1	"123456"
Var2	Array (' AB ', ' CD ')
Var3	Object value

Second, memcached installation (Windows)

1, download memcached software. Click to download >>

2, copy the memcached software to a directory, preferably in the PHP development environment directory, easy to manage.

3, into the Windows command console, enter the directory, install memcached.exe–d install [uninstall use memcached.exe-d Uninstall]

Note: You can use the memcached command directly in the command console by adding the directory where the memcached resides to the Path. For specific actions, please click to view similar operation steps.

4, Start/stop memcached service, memcached-d Start[stop]

If you start successfully, you can see in the service:

5, the default use of Memcached port is: 11211

Special Note: memcached The default boot maximum memory is M. If the required memcached memory is greater than 64M, you should start this way

Memcached–m 256m–d Start

iii. Basic command of memcached

Install, uninstall, start, configure related

-P Listening Port
The IP address of the-l connection, the default is native
-D Start memcached service
-D Restart Restart memcached service
-D Stop|shutdown shut down the running memcached service
-D Install installation memcached service
-d Uninstall Uninstall memcached service
-U Run as (only valid when run as root)
-m maximum memory usage, in MB. Default 64MB
-Returns an error when M memory is exhausted instead of deleting the item
-C Maximum Simultaneous connection number, default is 1024
-F Block size growth factor, default is 1.25
-N Minimum allocation space, key+value+flags default is 48
-H Display Help

iv. operation of Memcached

telnet localhost 11211--telnet memcached

Command	Description	Example
Get	Reads a value	Get MyKey
Set	Set a key unconditionally	Set MyKey 0 60 5
Add	ADD a new key	Add Newkey 0 60 5
Replace	Overwrite existing Key	Replace key 0 60 5
Append	Append data to existing key	Append key 0 60 15
Prepend	Prepend data to existing key	Prepend Key 0 60 15
incr	Increments numerical key value by given number	INCR MyKey 2
Decr	Decrements numerical key value by given number	DECR MyKey 5
Delete	Deletes an existing key	Delete MyKey
Flush_all	Invalidate specific items immediately	Flush_all
Invalidate all items in n seconds	Flush_all 900
Stats	Prints General statistics	Stats
Prints Memory statistics	Stats Slabs
Prints Memory statistics	Stats malloc
Print Higher level allocation statistics	Stats items
	Stats Detail
	Stats sizes
Resets statistics	Stats Reset
Version	Prints server version.	Version
Verbosity	Increases log level	Verbosity
Quit	Terminate Telnet session	Quit