Memcache (using Telnet operation)

memcache (using telnet operation)

1. How to use

1. Connect to Memcached

Telnet 192.168.1.100 11211

Add Name 0 60 5 [description Add is the name of the directive name is the key (is stored in key/value), 0 flags, 60 means that the data stored 60s 5 to put in much data], if a key already exists, and then put in is failed.

Get name [Gets the value of name]

Update

Set name 0 60 5 [if name this key exists, is updated, if key does not exist, it is added]

Delete

Delete key value

2. Common Commands

basic commands for memcached (installation, uninstall, startup, configuration 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

Basic commands for memcached (when memcached is started for commands that relate to the data that Memcached manages and its own running state):

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

Keywords for viewing information in Chinese and English tables

Pid	Memcache The process ID of the server
Uptime	Number of seconds the server has been running
Time	Server's current UNIX timestamp
Version	Memcache version
Pointer_size	The current operating system pointer size (32-bit system is typically 32bit)
Rusage_user	Cumulative user time for the process
Rusage_system	Cumulative system time of the process
Curr_items	The number of items currently stored by the server
Total_items	Total number of items stored since server startup
bytes	The number of bytes consumed by the current server storage items
Curr_connections	The number of connections currently open
Total_connections	Number of connections that have been opened since the server was started
Connection_structures	Number of connection constructs that the server assigns
Cmd_get	Get command (gets) the total number of requests
Cmd_set	Set command (save) number of total requests
Get_hits	Total Hit Count
Get_misses	Total missed Hits
Evictions	Number of items deleted to get free memory (the space allocated to memcache needs to be removed from the old items to get space allocated to new items)
Bytes_read	Total Read bytes (number of bytes requested)
Bytes_written	Total Bytes sent (result bytes)
Limit_maxbytes	Size of memory allocated to Memcache (bytes)
Threads	Current number of threads

Special attention:If your site needs more than 64m of memcached memory, you should start this way

Memcached–m 256m–d Start

If the memory used by memcached exceeds the defined memory, the most infrequently used memory is removed, and the algorithm is LRU

If you want to change a port

Memcached-d-M 30-l 127.0.0.1-p 9000-d start this command does not work with UNIX