INCR key : Increment value stored at key by one

Syntax

INCR key

    Increments the value of key by one.

Returns

Returns the value of key after the increment.

127.0.0.1:6379> set var 10 
OK 
127.0.0.1:6379> incr var 
(integer) 11 
127.0.0.1:6379> get var 
"11" 

 

"INCR" operation is limited to 64 bit signed integers, so if you try to perform on more than 64-bit numbers, it throws "out of range" error.

127.0.0.1:6379> set var 123456789098765432123456789 
OK 
127.0.0.1:6379> incr var 
(error) ERR value is not an integer or out of range 

 

“INCR” operaion performs on strings that can convert to integers, else error thrown.

127.0.0.1:6379> set var "hari" 
OK 
127.0.0.1:6379> incr var 
(error) ERR value is not an integer or out of range 
127.0.0.1:6379> 

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