In Redis, the SORT
command allows us to sort lists, sets, and sorted sets.
We can have the sorted elements returned to the client, or we can store them in a separate key.
Continue readingIn Redis, the SORT
command allows us to sort lists, sets, and sorted sets.
We can have the sorted elements returned to the client, or we can store them in a separate key.
Continue readingIn Redis, the TYPE
command returns a key’s type. More specifically, it returns the string representation of the type of the value stored at a given key.
In Redis, the UNLINK
command removes the specified keys. It’s similar to the DEL
command, except that it performs the memory reclaiming in a different thread, so it is not blocking. The DEL
command, on the other hand, doesn’t do this.
More specifically, the UNLINK
command unlinks the keys from the keyspace, and then removes it later asynchronously.
In Redis, the RENAMENX
command renames a key, but only if the new key doesn’t already exist.
RENAMENX
is similar to the RENAME
command, except that it only renames the key if the new one doesn’t already exist. The RENAME
command on the other hand, will overwrite the new key if it already exists.
The Redis CLI allows us to easily run a command multiple times. All we need to do is prefix the command with the number of times we want it to run.
Continue readingIn Redis, the RENAME
command renames a key. It allows us to give a key a new name.
In Redis, the COPY
command copies the value from one key to another.
This command was introduced in Redis 6.2.0.
Continue readingIn Redis, the RESTORE
command creates a key associated with a value that is obtained by deserialising the provided serialised value (obtained via the DUMP
command).
The serialisation format contains a 64-bit checksum, as well as the RDB version. The RESTORE
command checks the RDB version and data checksum. If they don’t match an error is returned.
In Redis, the GETRANGE
command allows us to get part of a string at a given key, starting and ending at the specified offsets.
The GETRANGE
command replaced the SUBSTR
command, which basically does the same thing. The SUBSTR
command is now considered deprecated (as of Redis 2.0.0).
In Redis, the SETRANGE
command allows us to overwrite part of a string at a given key, starting at a specified offset. It overwrites the old value from the specified offset, for the entire length of the new value.