domain: redis.io · 8 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Install any Redis client (redis-cli, or a library like redis-py / node-redis) and connect to the server.
Append an entry: `XADD mystream * sensor-id 1234 temp 19.8`. The `*` asks Redis to auto-generate a unique monotonically increasing ID (`<ms>-<seq>`).
Add field-value pairs after the ID - XADD requires at least one field/value pair.
Multiple pairs: `XADD mystream * field1 value1 field2 value2` - ordering of fields is preserved in the stream.
Cap the stream during the same call to stop unbounded growth: `XADD mystream MAXLEN ~ 1000 * field value` (approximate trim, more efficient than exact `=`).
Prevent accidental stream creation: `XADD mystream NOMKSTREAM * ...` errors if the key does not exist.
Also trim by min ID: `XADD mystream MINID 1700000000000-0 * ...` evicts entries with IDs lower than the threshold.
Read back with `XLEN mystream` and `XRANGE mystream - +` (all entries).
Known gotchas
XADD creates the stream automatically if absent unless NOMKSTREAM is used.
IDs are always monotonically increasing; after a clock jump backward or failover Redis uses the top entry time and increments the seq, so IDs stay ordered.
Explicit IDs (<ms>-<seq>) must be greater than all existing IDs or the command errors - only use them when matching an external system.
Approximate trim (`~`) may leave a few tens of entries over the cap - that is expected and faster.
XADD is the ONLY way to add to a stream; XDEL/XTRIM remove data.
Since Redis 8.2 the default KEEPREF preserves consumer-group references during trim.
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