Supported and restricted Valkey, Redis OSS and Memcached commands - Amazon ElastiCache

Supported and restricted Valkey, Redis OSS and Memcached commands

Supported Valkey and Redis OSS commands

Supported Valkey and Redis OSS commands

The following Valkey and Redis OSS commands are supported by serverless caches. In addition to these commands, these Supported Valkey and Redis OSS commands are also supported.

Bitmap Commands

  • BITCOUNT

    Counts the number of set bits (population counting) in a string.

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  • BITFIELD

    Performs arbitrary bitfield integer operations on strings.

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  • BITFIELD_RO

    Performs arbitrary read-only bitfield integer operations on strings.

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  • BITOP

    Performs bitwise operations on multiple strings, and stores the result.

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  • BITPOS

    Finds the first set (1) or clear (0) bit in a string.

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  • GETBIT

    Returns a bit value by offset.

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  • SETBIT

    Sets or clears the bit at offset of the string value. Creates the key if it doesn't exist.

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Cluster Management Commands

  • CLUSTER COUNTKEYSINSLOT

    Returns the number of keys in a hash slot.

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  • CLUSTER GETKEYSINSLOT

    Returns the key names in a hash slot.

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  • CLUSTER INFO

    Returns information about the state of a node. In a serverless cache, returns state about the single virtual “shard” exposed to the client.

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  • CLUSTER KEYSLOT

    Returns the hash slot for a key.

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  • CLUSTER MYID

    Returns the ID of a node. In a serverless cache, returns state about the single virtual “shard” exposed to the client.

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  • CLUSTER NODES

    Returns the cluster configuration for a node. In a serverless cache, returns state about the single virtual “shard” exposed to the client.

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  • CLUSTER REPLICAS

    Lists the replica nodes of a master node. In a serverless cache, returns state about the single virtual “shard” exposed to the client.

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  • CLUSTER SHARDS

    Returns the mapping of cluster slots to shards. In a serverless cache, returns state about the single virtual “shard” exposed to the client.

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  • CLUSTER SLOTS

    Returns the mapping of cluster slots to nodes. In a serverless cache, returns state about the single virtual “shard” exposed to the client.

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  • CLUSTER SLOT-STATS

    Allows tracking of per slot metrics for key count, CPU utilization, network bytes in, and network bytes out.

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  • READONLY

    Enables read-only queries for a connection to a Valkey or Redis OSS Cluster replica node.

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  • READWRITE

    Enables read-write queries for a connection to a Valkey or Redis OSS Cluster replica node.

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  • SCRIPT SHOW

    Returns the original source code of a script in the script cache.

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Connection Management Commands

  • AUTH

    Authenticates the connection.

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  • CLIENT GETNAME

    Returns the name of the connection.

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  • CLIENT REPLY

    Instructs the server whether to reply to commands.

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  • CLIENT SETNAME

    Sets the connection name.

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  • ECHO

    Returns the given string.

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  • HELLO

    Handshakes with the Valkey or Redis OSS server.

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  • PING

    Returns the server's liveliness response.

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  • QUIT

    Closes the connection.

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  • RESET

    Resets the connection.

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  • SELECT

    Changes the selected database.

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Generic Commands

  • COPY

    Copies the value of a key to a new key.

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  • DEL

    Deletes one or more keys.

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  • DUMP

    Returns a serialized representation of the value stored at a key.

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  • EXISTS

    Determines whether one or more keys exist.

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  • EXPIRE

    Sets the expiration time of a key in seconds.

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  • EXPIREAT

    Sets the expiration time of a key to a Unix timestamp.

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  • EXPIRETIME

    Returns the expiration time of a key as a Unix timestamp.

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  • PERSIST

    Removes the expiration time of a key.

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  • PEXPIRE

    Sets the expiration time of a key in milliseconds.

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  • PEXPIREAT

    Sets the expiration time of a key to a Unix milliseconds timestamp.

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  • PEXPIRETIME

    Returns the expiration time of a key as a Unix milliseconds timestamp.

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  • PTTL

    Returns the expiration time in milliseconds of a key.

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  • RANDOMKEY

    Returns a random key name from the database.

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  • RENAME

    Renames a key and overwrites the destination.

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  • RENAMENX

    Renames a key only when the target key name doesn't exist.

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  • RESTORE

    Creates a key from the serialized representation of a value.

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  • SCAN

    Iterates over the key names in the database.

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  • SORT

    Sorts the elements in a list, a set, or a sorted set, optionally storing the result.

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  • SORT_RO

    Returns the sorted elements of a list, a set, or a sorted set.

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  • TOUCH

    Returns the number of existing keys out of those specified after updating the time they were last accessed.

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  • TTL

    Returns the expiration time in seconds of a key.

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  • TYPE

    Determines the type of value stored at a key.

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  • UNLINK

    Asynchronously deletes one or more keys.

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Geospatial Commands

  • GEOADD

    Adds one or more members to a geospatial index. The key is created if it doesn't exist.

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  • GEODIST

    Returns the distance between two members of a geospatial index.

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  • GEOHASH

    Returns members from a geospatial index as geohash strings.

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  • GEOPOS

    Returns the longitude and latitude of members from a geospatial index.

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  • GEORADIUS

    Queries a geospatial index for members within a distance from a coordinate, optionally stores the result.

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  • GEORADIUS_RO

    Returns members from a geospatial index that are within a distance from a coordinate.

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  • GEORADIUSBYMEMBER

    Queries a geospatial index for members within a distance from a member, optionally stores the result.

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  • GEORADIUSBYMEMBER_RO

    Returns members from a geospatial index that are within a distance from a member.

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  • GEOSEARCH

    Queries a geospatial index for members inside an area of a box or a circle.

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  • GEOSEARCHSTORE

    Queries a geospatial index for members inside an area of a box or a circle, optionally stores the result.

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Hash Commands

  • HDEL

    Deletes one or more fields and their values from a hash. Deletes the hash if no fields remain.

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  • HEXISTS

    Determines whether a field exists in a hash.

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  • HGET

    Returns the value of a field in a hash.

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  • HGETALL

    Returns all fields and values in a hash.

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  • HINCRBY

    Increments the integer value of a field in a hash by a number. Uses 0 as initial value if the field doesn't exist.

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  • HINCRBYFLOAT

    Increments the floating point value of a field by a number. Uses 0 as initial value if the field doesn't exist.

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  • HKEYS

    Returns all fields in a hash.

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  • HLEN

    Returns the number of fields in a hash.

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  • HMGET

    Returns the values of all fields in a hash.

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  • HMSET

    Sets the values of multiple fields.

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  • HRANDFIELD

    Returns one or more random fields from a hash.

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  • HSCAN

    Iterates over fields and values of a hash.

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  • HSET

    Creates or modifies the value of a field in a hash.

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  • HSETNX

    Sets the value of a field in a hash only when the field doesn't exist.

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  • HSTRLEN

    Returns the length of the value of a field.

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  • HVALS

    Returns all values in a hash.

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HyperLogLog Commands

  • PFADD

    Adds elements to a HyperLogLog key. Creates the key if it doesn't exist.

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  • PFCOUNT

    Returns the approximated cardinality of the set(s) observed by the HyperLogLog key(s).

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  • PFMERGE

    Merges one or more HyperLogLog values into a single key.

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List Commands

  • BLMOVE

    Pops an element from a list, pushes it to another list and returns it. Blocks until an element is available otherwise. Deletes the list if the last element was moved.

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  • BLMPOP

    Pops the first element from one of multiple lists. Blocks until an element is available otherwise. Deletes the list if the last element was popped.

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  • BLPOP

    Removes and returns the first element in a list. Blocks until an element is available otherwise. Deletes the list if the last element was popped.

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  • BRPOP

    Removes and returns the last element in a list. Blocks until an element is available otherwise. Deletes the list if the last element was popped.

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  • BRPOPLPUSH

    Pops an element from a list, pushes it to another list and returns it. Block until an element is available otherwise. Deletes the list if the last element was popped.

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  • LINDEX

    Returns an element from a list by its index.

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  • LINSERT

    Inserts an element before or after another element in a list.

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  • LLEN

    Returns the length of a list.

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  • LMOVE

    Returns an element after popping it from one list and pushing it to another. Deletes the list if the last element was moved.

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  • LMPOP

    Returns multiple elements from a list after removing them. Deletes the list if the last element was popped.

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  • LPOP

    Returns the first elements in a list after removing it. Deletes the list if the last element was popped.

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  • LPOS

    Returns the index of matching elements in a list.

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  • LPUSH

    Prepends one or more elements to a list. Creates the key if it doesn't exist.

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  • LPUSHX

    Prepends one or more elements to a list only when the list exists.

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  • LRANGE

    Returns a range of elements from a list.

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  • LREM

    Removes elements from a list. Deletes the list if the last element was removed.

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  • LSET

    Sets the value of an element in a list by its index.

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  • LTRIM

    Removes elements from both ends a list. Deletes the list if all elements were trimmed.

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  • RPOP

    Returns and removes the last elements of a list. Deletes the list if the last element was popped.

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  • RPOPLPUSH

    Returns the last element of a list after removing and pushing it to another list. Deletes the list if the last element was popped.

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  • RPUSH

    Appends one or more elements to a list. Creates the key if it doesn't exist.

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  • RPUSHX

    Appends an element to a list only when the list exists.

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Pub/Sub Commands

Note

PUBSUB commands internally use sharded PUBSUB, so channel names will be mixed.

  • PUBLISH

    Posts a message to a channel.

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  • PUBSUB CHANNELS

    Returns the active channels.

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  • PUBSUB NUMSUB

    Returns a count of subscribers to channels.

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  • PUBSUB SHARDCHANNELS

    Returns the active shard channels.

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  • PUBSUB SHARDNUMSUB

    Returns the count of subscribers of shard channels.

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  • SPUBLISH

    Post a message to a shard channel

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  • SSUBSCRIBE

    Listens for messages published to shard channels.

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  • SUBSCRIBE

    Listens for messages published to channels.

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  • SUNSUBSCRIBE

    Stops listening to messages posted to shard channels.

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  • UNSUBSCRIBE

    Stops listening to messages posted to channels.

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Scripting Commands

  • EVAL

    Executes a server-side Lua script.

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  • EVAL_RO

    Executes a read-only server-side Lua script.

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  • EVALSHA

    Executes a server-side Lua script by SHA1 digest.

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  • EVALSHA_RO

    Executes a read-only server-side Lua script by SHA1 digest.

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  • SCRIPT EXISTS

    Determines whether server-side Lua scripts exist in the script cache.

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  • SCRIPT FLUSH

    Currently a no-op, script cache is managed by the service.

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  • SCRIPT LOAD

    Loads a server-side Lua script to the script cache.

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Server Management Commands

  • ACL CAT

    Lists the ACL categories, or the commands inside a category.

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  • ACL GENPASS

    Generates a pseudorandom, secure password that can be used to identify ACL users.

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  • ACL GETUSER

    Lists the ACL rules of a user.

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  • ACL LIST

    Dumps the effective rules in ACL file format.

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  • ACL USERS

    Lists all ACL users.

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  • ACL WHOAMI

    Returns the authenticated username of the current connection.

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  • DBSIZE

    Return the number of keys in the currently-selected database. This operation is not guaranteed to be atomic across all slots.

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  • COMMAND

    Returns detailed information about all commands.

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  • COMMAND COUNT

    Returns a count of commands.

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  • COMMAND DOCS

    Returns documentary information about one, multiple or all commands.

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  • COMMAND GETKEYS

    Extracts the key names from an arbitrary command.

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  • COMMAND GETKEYSANDFLAGS

    Extracts the key names and access flags for an arbitrary command.

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  • COMMAND INFO

    Returns information about one, multiple or all commands.

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  • COMMAND LIST

    Returns a list of command names.

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  • FLUSHALL

    Removes all keys from all databases. This operation is not guaranteed to be atomic across all slots.

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  • FLUSHDB

    Remove all keys from the current database. This operation is not guaranteed to be atomic across all slots.

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  • INFO

    Returns information and statistics about the server.

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  • LOLWUT

    Displays computer art and the Valkey or Redis OSS version.

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  • ROLE

    Returns the replication role.

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  • TIME

    Returns the server time.

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Set Commands

  • SADD

    Adds one or more members to a set. Creates the key if it doesn't exist.

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  • SCARDT

    Returns the number of members in a set.

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  • SDIFF

    Returns the difference of multiple sets.

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  • SDIFFSTORE

    Stores the difference of multiple sets in a key.

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  • SINTER

    Returns the intersect of multiple sets.

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  • SINTERCARD

    Returns the number of members of the intersect of multiple sets.

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  • SINTERSTORE

    Stores the intersect of multiple sets in a key.

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  • SISMEMBER

    Determines whether a member belongs to a set.

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  • SMEMBERS

    Returns all members of a set.

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  • SMISMEMBER

    Determines whether multiple members belong to a set.

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  • SMOVE

    Moves a member from one set to another.

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  • SPOP

    Returns one or more random members from a set after removing them. Deletes the set if the last member was popped.

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  • SRANDMEMBER

    Get one or multiple random members from a set

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  • SREM

    Removes one or more members from a set. Deletes the set if the last member was removed.

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  • SSCAN

    Iterates over members of a set.

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  • SUNION

    Returns the union of multiple sets.

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  • SUNIONSTORE

    Stores the union of multiple sets in a key.

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Sorted Set Commands

  • BZMPOP

    Removes and returns a member by score from one or more sorted sets. Blocks until a member is available otherwise. Deletes the sorted set if the last element was popped.

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  • BZPOPMAX

    Removes and returns the member with the highest score from one or more sorted sets. Blocks until a member available otherwise. Deletes the sorted set if the last element was popped.

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  • BZPOPMIN

    Removes and returns the member with the lowest score from one or more sorted sets. Blocks until a member is available otherwise. Deletes the sorted set if the last element was popped.

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  • ZADD

    Adds one or more members to a sorted set, or updates their scores. Creates the key if it doesn't exist.

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  • ZCARD

    Returns the number of members in a sorted set.

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  • ZCOUNT

    Returns the count of members in a sorted set that have scores within a range.

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  • ZDIFF

    Returns the difference between multiple sorted sets.

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  • ZDIFFSTORE

    Stores the difference of multiple sorted sets in a key.

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  • ZINCRBY

    Increments the score of a member in a sorted set.

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  • ZINTER

    Returns the intersect of multiple sorted sets.

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  • ZINTERCARD

    Returns the number of members of the intersect of multiple sorted sets.

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  • ZINTERSTORE

    Stores the intersect of multiple sorted sets in a key.

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  • ZLEXCOUNT

    Returns the number of members in a sorted set within a lexicographical range.

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  • ZMPOP

    Returns the highest- or lowest-scoring members from one or more sorted sets after removing them. Deletes the sorted set if the last member was popped.

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  • ZMSCORE

    Returns the score of one or more members in a sorted set.

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  • ZPOPMAX

    Returns the highest-scoring members from a sorted set after removing them. Deletes the sorted set if the last member was popped.

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  • ZPOPMIN

    Returns the lowest-scoring members from a sorted set after removing them. Deletes the sorted set if the last member was popped.

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  • ZRANDMEMBER

    Returns one or more random members from a sorted set.

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  • ZRANGE

    Returns members in a sorted set within a range of indexes.

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  • ZRANGEBYLEX

    Returns members in a sorted set within a lexicographical range.

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  • ZRANGEBYSCORE

    Returns members in a sorted set within a range of scores.

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  • ZRANGESTORE

    Stores a range of members from sorted set in a key.

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  • ZRANK

    Returns the index of a member in a sorted set ordered by ascending scores.

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  • ZREM

    Removes one or more members from a sorted set. Deletes the sorted set if all members were removed.

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  • ZREMRANGEBYLEX

    Removes members in a sorted set within a lexicographical range. Deletes the sorted set if all members were removed.

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  • ZREMRANGEBYRANK

    Removes members in a sorted set within a range of indexes. Deletes the sorted set if all members were removed.

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  • ZREMRANGEBYSCORE

    Removes members in a sorted set within a range of scores. Deletes the sorted set if all members were removed.

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  • ZREVRANGE

    Returns members in a sorted set within a range of indexes in reverse order.

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  • ZREVRANGEBYLEX

    Returns members in a sorted set within a lexicographical range in reverse order.

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  • ZREVRANGEBYSCORE

    Returns members in a sorted set within a range of scores in reverse order.

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  • ZREVRANK

    Returns the index of a member in a sorted set ordered by descending scores.

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  • ZSCAN

    Iterates over members and scores of a sorted set.

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  • ZSCORE

    Returns the score of a member in a sorted set.

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  • ZUNION

    Returns the union of multiple sorted sets.

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  • ZUNIONSTORE

    Stores the union of multiple sorted sets in a key.

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Stream Commands

  • XACK

    Returns the number of messages that were successfully acknowledged by the consumer group member of a stream.

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  • XADD

    Appends a new message to a stream. Creates the key if it doesn't exist.

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  • XAUTOCLAIM

    Changes, or acquires, ownership of messages in a consumer group, as if the messages were delivered to as consumer group member.

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  • XCLAIM

    Changes, or acquires, ownership of a message in a consumer group, as if the message was delivered a consumer group member.

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  • XDEL

    Returns the number of messages after removing them from a stream.

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  • XGROUP CREATE

    Creates a consumer group.

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  • XGROUP CREATECONSUMER

    Creates a consumer in a consumer group.

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  • XGROUP DELCONSUMER

    Deletes a consumer from a consumer group.

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  • XGROUP DESTROY

    Destroys a consumer group.

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  • XGROUP SETID

    Sets the last-delivered ID of a consumer group.

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  • XINFO CONSUMERS

    Returns a list of the consumers in a consumer group.

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  • XINFO GROUPS

    Returns a list of the consumer groups of a stream.

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  • XINFO STREAM

    Returns information about a stream.

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  • XLEN

    Return the number of messages in a stream.

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  • XPENDING

    Returns the information and entries from a stream consumer group's pending entries list.

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  • XRANGE

    Returns the messages from a stream within a range of IDs.

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  • XREAD

    Returns messages from multiple streams with IDs greater than the ones requested. Blocks until a message is available otherwise.

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  • XREADGROUP

    Returns new or historical messages from a stream for a consumer in a group. Blocks until a message is available otherwise.

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  • XREVRANGE

    Returns the messages from a stream within a range of IDs in reverse order.

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  • XTRIM

    Deletes messages from the beginning of a stream.

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String Commands

  • APPEND

    Appends a string to the value of a key. Creates the key if it doesn't exist.

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  • DECR

    Decrements the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.

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  • DECRBY

    Decrements a number from the integer value of a key. Uses 0 as initial value if the key doesn't exist.

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  • GET

    Returns the string value of a key.

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  • GETDEL

    Returns the string value of a key after deleting the key.

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  • GETEX

    Returns the string value of a key after setting its expiration time.

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  • GETRANGE

    Returns a substring of the string stored at a key.

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  • GETSET

    Returns the previous string value of a key after setting it to a new value.

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  • INCR

    Increments the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.

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  • INCRBY

    Increments the integer value of a key by a number. Uses 0 as initial value if the key doesn't exist.

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  • INCRBYFLOAT

    Increment the floating point value of a key by a number. Uses 0 as initial value if the key doesn't exist.

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  • LCS

    Finds the longest common substring.

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  • MGET

    Atomically returns the string values of one or more keys.

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  • MSET

    Atomically creates or modifies the string values of one or more keys.

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  • MSETNX

    Atomically modifies the string values of one or more keys only when all keys don't exist.

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  • PSETEX

    Sets both string value and expiration time in milliseconds of a key. The key is created if it doesn't exist.

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  • SET

    Sets the string value of a key, ignoring its type. The key is created if it doesn't exist.

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  • SETEX

    Sets the string value and expiration time of a key. Creates the key if it doesn't exist.

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  • SETNX

    Set the string value of a key only when the key doesn't exist.

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  • SETRANGE

    Overwrites a part of a string value with another by an offset. Creates the key if it doesn't exist.

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  • STRLEN

    Returns the length of a string value.

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  • SUBSTR

    Returns a substring from a string value.

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Transaction Commands

Restricted Valkey and Redis OSS commands

To deliver a managed service experience, ElastiCache restricts access to certain cache engine-specific commands that require advanced privileges. For caches running Redis OSS, the following commands are unavailable:

  • acl setuser

  • acl load

  • acl save

  • acl deluser

  • bgrewriteaof

  • bgsave

  • cluster addslot

  • cluster addslotsrange

  • cluster bumpepoch

  • cluster delslot

  • cluster delslotsrange

  • cluster failover

  • cluster flushslots

  • cluster forget

  • cluster links

  • cluster meet

  • cluster setslot

  • config

  • debug

  • migrate

  • psync

  • replicaof

  • save

  • slaveof

  • shutdown

  • sync

In addition, the following commands are unavailable for serverless caches:

  • acl log

  • client caching

  • client getredir

  • client id

  • client info

  • client kill

  • client list

  • client no-evict

  • client pause

  • client tracking

  • client trackinginfo

  • client unblock

  • client unpause

  • cluster count-failure-reports

  • fcall

  • fcall_ro

  • function

  • function delete

  • function dump

  • function flush

  • function help

  • function kill

  • function list

  • function load

  • function restore

  • function stats

  • keys

  • lastsave

  • latency

  • latency doctor

  • latency graph

  • latency help

  • latency histogram

  • latency history

  • latency latest

  • latency reset

  • memory

  • memory doctor

  • memory help

  • memory malloc-stats

  • memory purge

  • memory stats

  • memory usage

  • monitor

  • move

  • object

  • object encoding

  • object freq

  • object help

  • object idletime

  • object refcount

  • pfdebug

  • pfselftest

  • psubscribe

  • pubsub numpat

  • punsubscribe

  • script kill

  • slowlog

  • slowlog get

  • slowlog help

  • slowlog len

  • slowlog reset

  • swapdb

  • unwatch

  • wait

  • watch

Supported Memcached commands

ElastiCache Serverless for Memcached supports all of the memcached commands in open source memcached 1.6 except for the following:

  • Client connections require TLS, as a result UDP protocol is not supported.

  • Binary protocol is not supported, as it is officially deprecated in memcached 1.6.

  • GET/GETS commands are limited to 16KB to avoid potential DoS attack to the server with fetching large number of keys.

  • Delayed flush_all command will be rejected with CLIENT_ERROR.

  • Commands that configure the engine or reveal internal information about engine state or logs are not supported, such as:

    • For STATS command, only stats and stats reset are supported. Other variations will return ERROR

    • lru / lru_crawler - modification for LRU and LRU crawler settings

    • watch - watches memcached server logs

    • verbosity - configures the server log level

    • me - meta debug (me) command is not supported