Memcached basics 15

cas

cas namely checked and set It means , Only if the last parameter and gets Only when the obtained parameters match can they be stored , Otherwise return to “EXISTS”

gets a

VALUE a 0 8 11

lkjhgfds

END

cas a 0 0 8 12

asdfghjk

EXISTS

gets a

VALUE a 0 8 11

lkjhgfds

END

cas a 0 0 8 11

asdfdsas

STORED

gets a

VALUE a 0 8 12

asdfdsas

END

append

Add cached data after existing cached data , As existing cached key No server exists. The response is ERROR

get a

VALUE a 0 8

asdfdsas

END

append a 0 0 8

lkjhhjkl

STORED

get a

VALUE a 0 16

asdfdsaslkjhhjkl

END

append uu

ERROR