COPY source destination [DB destination-db] [REPLACE]

Available since 6.2.0.

Time complexity: O(N) worst case for collections, where N is the number of nested items. O(1) for string values.

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 an error when the destination key already exists. The REPLACE option removes the destination key before copying the value to it.

*Return value

Integer reply, specifically:

  • 1 if source was copied.
  • 0 if source was not copied.

*Examples

SET dolly "sheep"
COPY dolly clone
GET clone