XDEL key ID [ID …]

Time complexity: O(1) for each single item to delete in the stream, regardless of the stream size.

Normally you may think at a Redis stream as an append-only data structure, however Redis streams are represented in memory, so we are able to also delete entries. This may be useful, for instance, in order to comply with certain privacy policies.

*Understanding the low level details of entries deletion

Eventually if all the entries in a macro-node are marked as deleted, the whole node is destroyed and the memory reclaimed. This means that if you delete a large amount of entries from a stream, for instance more than 50% of the entries appended to the stream, the memory usage per entry may increment, since what happens is that the stream will start to be fragmented. However the stream performances will remain the same.

: the number of entries actually deleted.

*Examples