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Memcached Edition Command Compatibility

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Last updated: 2026-03-17 18:11:00

Memcached Edition instances are compatible with the Memcached protocol and support the following commands: set, add, replace, append, prepend, cas, get, bget, gets, get_ext, gets_ext, delete, incr, decr.
Command
Compatible Version
Meaning
set
Memcached protocol 1.6
Set a key-value pair. If the key does not exist, it will create the key; if the key already exists, it will overwrite the old value.
add
﻿
Add a key-value pair to the cache, but only when the key does not exist. If the key already exists, however, the command does nothing.
replace
﻿
Replace a key-value pair in the cache, but only when the key already exists. If the key does not exist, however, the command does nothing.
append
﻿
Append data to the end of the existing value of a key. If the key does not exist, however, the command does nothing.
prepend
﻿
Prepend data to the beginning of the existing value of a key. If the key does not exist, however, the command does nothing.
cas
﻿
Compare and swap. This command first checks whether the current value of the key matches the provided value; if it does, the value is updated to the new one.
get
﻿
Retrieve the value of one or more keys from the cache. If no keys are found, an error will be returned.
bget
﻿
Batch Get. This is a binary protocol command used to retrieve the values of multiple keys from the cache.
gets
﻿
Similar to get, it obtains the value of a key in the cache and returns a version number.
get_ext
﻿
Extended binary protocol command that allows the client to specify more options to control the data retrieval process.
gets_ext
﻿
Extended command with versioning that allows the client to retrieve the value of a key while also obtaining a version number for subsequent atomic operations.
delete
﻿
Delete a key-value pair from the cache. If the key does not exist, however, the command does nothing.
incr
﻿
Increment the value of a key by a specified integer. If the key does not exist, an initial value can be specified. If the value of the key is not an integer, the operation will fail.
decr
﻿
Decrement the value of the key by the specified integer.

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Tencent Cloud Distributed Cache (Redis OSS-Compatible)

Memcached Edition Command Compatibility

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Command	Compatible Version	Meaning
set	Memcached protocol 1.6	Set a key-value pair. If the key does not exist, it will create the key; if the key already exists, it will overwrite the old value.
add			Add a key-value pair to the cache, but only when the key does not exist. If the key already exists, however, the command does nothing.
replace			Replace a key-value pair in the cache, but only when the key already exists. If the key does not exist, however, the command does nothing.
append			Append data to the end of the existing value of a key. If the key does not exist, however, the command does nothing.
prepend			Prepend data to the beginning of the existing value of a key. If the key does not exist, however, the command does nothing.
cas			Compare and swap. This command first checks whether the current value of the key matches the provided value; if it does, the value is updated to the new one.
get			Retrieve the value of one or more keys from the cache. If no keys are found, an error will be returned.
bget			Batch Get. This is a binary protocol command used to retrieve the values of multiple keys from the cache.
gets			Similar to get, it obtains the value of a key in the cache and returns a version number.
get_ext			Extended binary protocol command that allows the client to specify more options to control the data retrieval process.
gets_ext			Extended command with versioning that allows the client to retrieve the value of a key while also obtaining a version number for subsequent atomic operations.
delete			Delete a key-value pair from the cache. If the key does not exist, however, the command does nothing.
incr			Increment the value of a key by a specified integer. If the key does not exist, an initial value can be specified. If the value of the key is not an integer, the operation will fail.
decr			Decrement the value of the key by the specified integer.