Category: Redis

Redis ZRANGEBYSCORE Replacement

Posted on by Ian

Starting with Redis 6.2.0, the ZRANGE command added the REV, BYSCORE, BYLEX and LIMIT options. The addition of the first three options means that the ZRANGE command can now do what the ZREVRANGE, ZRANGEBYSCORE, ZREVRANGEBYSCORE, ZRANGEBYLEX and ZREVRANGEBYLEX commands can do.

As a result, those commands are now deprecated (as of Redis 6.2.0).

Therefore, we should no longer use the ZRANGEBYSCORE command when we need to return a sorted set by score. Instead, we should use the ZRANGE command with the BYSCORE argument.

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Fix “ERR wrong number of arguments for ‘srem’ command” in Redis

Posted on by Ian

If you’re getting an error that reads “ERR wrong number of arguments for ‘srem’ command” in Redis, it’s probably because you’re calling the SREM command with the wrong number of arguments.

To fix this issue, make sure you pass the correct number of arguments. At the time of writing, the SREM command requires at least two arguments.

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How to Allow Duplicate Fields when using HRANDFIELD in Redis

Posted on by Ian

By default, Redis’s HRANDFIELD command returns distinct fields. In other words, it won’t return the same field multiple times – each field that’s returned by the command will only be returned once.

However, we can override this behaviour by using an negative count value for the count argument.

When we pass a negative count argument, the HRANDFIELD command allows non-distinct fields to be returned.

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