Command Restrictions

Some Redis commands are supported by Redis Cluster DCS instances for multi-key operations in the same slot. For details, see Table 1.

Some commands support multiple keys but do not support cross-slot access. For details, see Table 2.

**Table 1** Redis commands restricted in Redis Cluster DCS instances
Category	Description
Set
SINTER	Returns the members of the set resulting from the intersection of all the given sets.
SINTERSTORE	Equal to SINTER, but instead of returning the result set, it is stored in destination.
SUNION	Returns the members of the set resulting from the union of all the given sets.
SUNIONSTORE	Equal to SUNION, but instead of returning the result set, it is stored in destination.
SDIFF	Returns the members of the set resulting from the difference between the first set and all the successive sets.
SDIFFSTORE	Equal to SDIFF, but instead of returning the result set, it is stored in destination.
SMOVE	Moves member from the set at source to the set at destination.
Sorted Set
ZUNIONSTORE	Computes the union of numkeys sorted sets given by the specified keys.
ZINTERSTORE	Computes the intersection of numkeys sorted sets given by the specified keys.
HyperLogLog
PFCOUNT	Returns the approximated cardinality computed by the HyperLogLog data structure stored at the specified variable.
PFMERGE	Merges multiple HyperLogLog values into a unique value.
Keys
RENAME	Renames key to newkey.
RENAMENX	Renames key to newkey if newkey does not yet exist.
BITOP	Performs a bitwise operation between multiple keys (containing string values) and stores the result in the destination key.
RPOPLPUSH	Returns and removes the last element (tail) of the list stored at source, and pushes the element at the first element (head) of the list stored at destination.
String
MSETNX	Merges multiple HyperLogLog values into a unique value.

While running commands that take a long time to run, such as FLUSHALL, DCS instances may not respond to other commands and may change to the faulty state. After the command finishes executing, the instance will return to normal.

**Table 2** Multi-key commands of Proxy Cluster instances
Category	Command
Multi-key commands that support cross-slot access	DEL, MGET, MSET, EXISTS, SUNION, SINTER, SDIFF, SUNIONSTORE, SINTERSTORE, SDIFFSTORE, ZUNIONSTORE, ZINTERSTORE
Multi-key commands that do not support cross-slot access	SMOVE, SORT, BITOP, MSETNX, RENAME, RENAMENX, BLPOP, BRPOP, RPOPLPUSH, BRPOPLPUSH, PFMERGE, PFCOUNT, BLMOVE, COPY, GEOSEARCHSTORE, LMOVE, ZRANGESTORE