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with PHP, I am getting text in this form:
key1,key2,keyn
I am then transforming this text into an array. Now, what I am trying to do is for each of this key, get its list lenght. I know I can do a foreach with a “llen” command inside, but is it possible to do it with just one query?
Also, more generally, is this usually possible to do with other DBs, like mySQL OR mongo? Is a simple “or” statement not too heavy if the values to search against are too many?
Thanks in advance.
No, there’s not “multi-llen” command. Do it in the loop.
If you pipeline all LLEN commands, it’s gonna be almost as fast as a single LLEN, because you don’t need to wait for a reply for each LLEN. Beware, though, that your redis client might not support getting results of pipelined commands.