Tagged: memcached

As we see before we have done Set CAS operation to increment counter key value. Here is a operator to increment and decrement values directly.

incr  is the operation key is the key we want to increment incrementvalue the value we want to increment Example Let’s do simple example

Now we have a key named counter we want to increment it.

Decrement

decr  is the operation key is the...

Get CAS is used to track key-values in Memcached. Get CAS provides the value with a token. This token is used to Set CAS operation. Syntax is similar to get.

gets verb key  the key we want its value Example We can get an existing value with gets. First we will add some data nırmmaly.

Now we want to get the data with token by using gets.

gets is...

We store key-values all time but I belive that the time to get these values have came :). Now we will look how to get values by providing keys. The simplest syntax in memcached is get operation.

get is the verb of the operation. key1  is the key of the value we want to get key2,key3,… are the keys we want to get. We can get multiple values with single get....

Check and Set Operation aka CAS is a update for existing key-value. For example we get a key-value counter-123 and we increased it to locally 124. Then we try to update the key-value like counter-124 Memcached checks if the value is changed by others. If it is changed we get an error. To track changes Memcached gives us a token.

cas the name of the operation key the key we want...

Prepend operation is simple and made on existing key-value. Newly provided value will be added at the beginning of existing value. Syntax is the same as other commands.

prepend the operation key the key where its value will be prepended flag  as you know expiretime  how much time key-value will be hold bytes the size of the value Let’s add some data for start

Now append more data please

prepend as we guess operation...

Append operation is simple and made on existing key-value. Newly provided value will be added at the end of existing value. Syntax is the same as other commands.

append the operation key the key where its value will be appended flag  as you know expiretime  how much time key-value will be hold bytes the size of the value Let’s add some data for start

Now append more data please

append as...

Replace operation will change existing key-value. If the key-value do not exists we will get an response like NOT_STORED. Its syntax is similar to add.

replace is the name of the verb key the key which replaced flag as flag expiretime  the time range the key-value stored in memcached bytes  the size of the new value value new value Let’s add new data  and check it exists.

We will replace poftut key-value with new value....

To remove stored key-value pairs delete operation is used. Delete is one of the most simple command in Memcached.

delete is the operation key is the key we want to delete Example Let’s add some key-value to delete 🙂

We we can delete key-value with our delete operation.

Add operation is similar to the set operation but the difference is that is a key is all ready exists NOT_STORED code is returned. This makes add operation more reliable than set and aware of the key overwrite. Syntax is like below

key is the identifier of the value flags is operations details expiretime  is the time the key-value will be hold in memory. bytes is total size of the value...

Set is most used command in Memcached. Its store data. If the data exists it will be over written. New data is always added at the top of the LRU. LRU means Last Recently Used.  Syntax of the set is like below.

Now we will add and url  with set operation.

set is the operation poftut is the key to find data 0 is the flag so there is no flag...