Tair:Limits on commands supported by Tair

Usage notes

Cluster and read/write splitting instances do not support the SWAPDB, CLIENT ID, or SORT (with the BY and GET options) command, and have limits on specific commands. For more information, see Limits on commands supported by cluster instances and Limits on the commands supported by read/write splitting instances.

Supported commands

Limits on commands supported by Tair instances

• DRAM-based instances

  No limits.

• Persistent memory-optimized instances

  Command group	Unsupported command
  Keys	RENAME, RENAMENX, and MOVE Note Persistent memory-optimized instances that run the minor version 1.2.4 or later are compatible with MOVE and RENAME commands. You can specify the pena_rename_move_compatible_enabled parameter to use these commands. For more information, see Modify the values of parameters for an instance.
  Server	SWAPDB
  Streams	XACK, XADD, XCLAIM, XDEL, XGROUP, XINFO, XLEN, XPENDING, XRANGE, XREAD, XREADGROUP, XREVRANGE, and XTRIM Note Persistent memory-optimized instances that run the minor version 1.2.3 or later support the Streams command group.

  If your persistent memory-optimized instance runs the minor version earlier than 1.2.4, the instance performance degrades as the size of keys increases when you perform specific UPDATE commands. If the size of keys increases to the MB level, the latency of the engine significantly rises. These commands include SETRANGE, SETBIT, APPEND, and BITFIELD. To run these commands, update your instance to V1.2.4 or later. For more information, see Update the minor version of an instance.

• ESSD-based instances

  Command group	Unsupported command
  Geo	GEOADD, GEODIST, GEOHASH, GEOPOS, GEORADIUS, GEORADIUS_RO, GEORADIUSBYMEMBER, and GEORADIUSBYMEMBER_RO
  Hyperloglog	PFADD, PFDEBUG, PFCOUNT, PFMERGE, and PFSELFTEST
  Keys	RENAME, RENAMENX, MOVE, OBJECT, SORT, and TOUCH
  Lists	BRPOP, BLPOP, and BRPOPLPUSH Note ESSD-based instances that run the minor version 2.3.2 or later support these commands. To run these commands, update your instance to V2.3.2 or later.
  Scripting	EVAL, EVALSHA, SCRIPT DEBUG, SCRIPT EXISTS, SCRIPT FLUSH, SCRIPT KILL, and SCRIPT LOAD Note ESSD-based instances that run the minor version 2.3.1 or later support commands of Lua scripts by using the txn-isolation-lock and #no_loose_lua-strict-mode parameters. To run these commands, update your instance to V2.3.1 or later. For more information, see Modify the values of parameters for an instance.
  Strings	BITCOUNT, BITFIELD, BITOP, BITPOS, GETBIT, and SETBIT Note ESSD-based instances that run the minor version 2.3.1 or later support these commands.
  Server	SWAPDB
  Transactions	DISCARD, EXEC, MULTI, UNWATCH, and WATCH Note ESSD-based instances that run the minor version 2.3.1 or later support these commands by using the txn-isolation-lock parameter. To run these commands, update your instance to V2.3.1 or later. For more information, see Modify the values of parameters for an instance.
  Streams	XACK, XADD, XCLAIM, XDEL, XGROUP, XINFO, XLEN, XPENDING, XRANGE, XREAD, XREADGROUP, XREVRANGE, and XTRIM

• Hybrid-storage instances (phased out)

  Command group	Unsupported command
  Keys	RENAME, RENAMENX, MOVE, and SORT (STORE option)
  Lists	LINSERT and LREM
  Server	SWAPDB
  Scripting	SCRIPT DEBUG and SCRIPT LOAD