Auto Increment in Redis

[Madhusudhana]

Hello Redis Experts,

I have one requirement in my app, where users are hitting on one URL, that URL count has to increase automatically, I can use MongoDB but it will be a burden to DB.

So I decided to use Redis but in Redis, there is no auto-increment on one field.

Any better approach would be nice to share 

Thanks

Madhusudhan Reddy

[Greg Andrews]

I'm not sure what you mean by "auto-increment". Are you envisioning a field in a hash key that Redis increments when some other command is received, such as reading or writing the contents of the key?  Something else?

[David Maier (Redis)]

Hi Madhusudhana,

The easiest is to just use the URL as the key and let the application perform an INCR command on that key whenever the URL is visited. You might also want to take a look at the HyperLogLog commands in order to track the unique visitors in a space-efficient way.

BTW: In relational databases auto-incrementing columns are usually associated to events that change data (e.g., inserting). You can implement something similar by using keyspace notifications or triggers and functions with Redis.

Regards,

David

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[Bill Schoonmaker]

INCR has been in there since version 1. Couple this with functions and triggers in 7.2 and you should be able to implement a nice auto increment pretty handily. Good luck!

127.0.0.1:6379> set counter 0
OK
127.0.0.1:6379> incr counter
(integer) 1
127.0.0.1:6379> get counter
"1"
127.0.0.1:6379> incr counter
(integer) 2
127.0.0.1:6379> get counter
"2"
127.0.0.1:6379> incr counter
(integer) 3
127.0.0.1:6379> get counter
"3"
127.0.0.1:6379>