In Redis, the ZREM command removes one or more members from the specified sorted set.
Category: Redis
Fix “WRONGTYPE Operation against a key holding the wrong kind of value” when using ZUNION or ZUNIONSTORE in Redis
If you get an error that reads “WRONGTYPE Operation against a key holding the wrong kind of value” when using the ZUNION or ZUNIONSTORE commands in Redis, it’s because you’re passing a key with the wrong data type.
To fix this issue, make sure the keys you pass to these commands contain either sets or sorted sets. Although these commands are for sorted sets, they also work with non-sorted sets.
Continue readingRedis ZINCRBY Command Explained
In Redis, the ZINCRBY command increments the score of a given member in a sorted set.
Redis ZREVRANGE Replacement
Starting with Redis 6.2.0, the ZRANGE command added the REV, BYSCORE, BYLEX and LIMIT options. The addition of the first three 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 ZREVRANGE command when we need to return a sorted set in descending order. Instead, we should use the ZRANGE command with the REV argument.
Redis BZPOPMAX Command Explained
In Redis, the BZPOPMAX command is the blocking variant of the ZPOPMAX command.
The BZPOPMAX command works similar to ZPOPMAX when any of the sorted sets contain elements. That is, it pops a member with the highest score from the sorted set.
Redis BZPOPMIN Command Explained
In Redis, the BZPOPMIN command is the blocking variant of the ZPOPMIN command.
The BZPOPMIN command works similar to ZPOPMIN when any of the sorted sets contain elements. That is, it pops a member with the lowest score from the sorted set.
Redis ZPOPMAX Command Explained
In Redis, the ZMPOPMAX command removes and returns (pops) members with the highest scores from the specified sorted set. By default it pops one member, but we can also specify how many members we want to pop.
Redis ZPOPMIN Command Explained
In Redis, the ZMPOPMIN command removes and returns (pops) members with the lowest scores from the specified sorted set. By default it pops one member, but we can also specify how many members we want to pop.
Redis BZMPOP Command Explained
In Redis, the BZMPOP command is the blocking variant of the ZMPOP command.
The BZMPOP command works exactly like ZMPOP when any of the sorted sets contain elements. It also works exactly like ZMPOP when used inside a MULTI/EXEC block. That is, it pops one or more elements from the first non-empty sorted set in the provided list of keys.
However, if all of the specified sorted sets are empty, then BZMPOP will block the connection until another client adds members to one of the keys or until the specified timeout elapses. It’s possible to block the connection indefinitely by using a timeout of zero.
Redis ZMPOP Command Explained
In Redis, the ZMPOP command removes and returns one or more elements from the first non-empty sorted set in the provided list of keys.
The ZMPOP command was introduced in Redis 7.0.0.