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Memcached : Basic Usage
2016/09/11 |
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This is Basic Usage of Memcached when connectiong with Telnet client.
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| [1] | Install Telnet client. |
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root@dlp:~# apt-get -y install telnet
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| [2] | This is Basic Usage of Memcached. |
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# connect to local Memcached root@dlp:~# telnet localhost 11211 Trying ::1... Connected to localhost. Escape character is '^]'. # show status of Memcached stats STAT pid 10856 STAT uptime 12222 STAT time 1468912383 ..... ..... STAT evictions 0 STAT reclaimed 0 END # save data (on memory) # set [Key] [Flag] [Validity Term(sec)] [Data Size(byte)] # Flag : 0=compression off, 1=compression on # Validity Term=0 means indefinite # after inputting command above, input a Value of the Key
set test_key 0 0 10
test_value
STORED
# refer to Value of a Key
get test_key
VALUE test_key 0 10
test_value
END
# replace Value of a Key replace test_key 0 0 11 test_value2 STORED get test_key VALUE test_key 0 11 test_value2 END # append Value of a Key append test_key 0 0 5 ,test STORED get test_key VALUE test_key 0 16 test_value2,test END # prepend Value of a Key prepend test_key 0 0 6 test1, STORED get test_key VALUE test_key 0 22 test1,test_value2,test END # delete a Key
delete test_key
DELETED
# increment Value of a Key set mycounter 0 0 1 1 STORED incr mycounter 1 2 get mycounter VALUE mycounter 0 1 2 END # decrement Value of a Key decr mycounter 1 1 get mycounter VALUE mycounter 0 1 1 END # delete all caching data on memory flush_all OK |
| [3] | For CAS (Check And Set) operarion, use "cas" command like follows. |
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# refer to Value with CAS ID # on the example below, CAS ID = 15
gets test_key
VALUE test_key 0 10 15
test_value
END
# update data with cas command # cas [Key] [Flag] [validity term(sec)] [data size(byte)] [CAS ID] cas test_key 0 0 11 15 test2_value STORED gets test_key VALUE test_key 0 11 16 test2_value END |