Copies the value of a key to a new key.
COPY source
destination [DB
destination-db] [REPLACE]
This command copies the value stored at the source key
to the destination key.
By default, the destination key is created in the
logical database used by the connection. The DB option
allows specifying an alternative logical database index for the
destination key.
The command returns zero when the destination key
already exists. The REPLACE option removes the
destination key before copying the value to it.
One of the following:
Integer reply:
1 if source was copied.
Integer reply:
0 if source was not copied when the destination
key already exists.
O(N) worst case for collections, where N is the number of nested items. O(1) for string values.
@keyspace @slow @write
SET dolly "sheep"
COPY dolly clone
GET cloneDEL, DUMP, EXISTS, EXPIRE, EXPIREAT, EXPIRETIME, KEYS, MIGRATE, MOVE, OBJECT, OBJECT ENCODING, OBJECT FREQ, OBJECT HELP, OBJECT IDLETIME, OBJECT REFCOUNT, PERSIST, PEXPIRE, PEXPIREAT, PEXPIRETIME, PTTL, RANDOMKEY, RENAME, RENAMENX, RESTORE, SCAN, SORT, SORT_RO, TOUCH, TTL, TYPE, UNLINK, WAIT, WAITAOF.