# Create and Manage Streams
# Attributes of a Stream
For fault tolerance and higher availability, every stream can be replicated across nodes in the cluster. A typical production setting is a replication factor of 3, i.e., there will always be three copies of your data, which is helpful just in case things go wrong or you want to do maintenance on the brokers. This replication is performed at the level of the stream.
The configuration controls how long streams of HStreamDB retain records after being appended. HStreamDB will discard the message regardless of whether it is consumed when it exceeds the backlog retention duration.
- Default = 7 days
- Minimum value = 1 seconds
- Maximum value = 21 days
The number of shards that a stream will have.
# Create a Stream
Create a stream before you write records or create a subscription.
# Delete a Stream
Deletion is only allowed when a stream has no subsequent subscriptions unless the force flag is set.
# Delete a stream with the force flag
If you need to delete a stream with subscriptions, enable force deletion. Existing stream subscriptions can still read from the backlog after deleting a stream with the force flag enabled. However, these subscriptions will have stream name
__deleted_stream__, no new subscription creation on the deleted stream would be allowed, nor new records would be allowed to be written to the stream.
# List Streams
To get all streams in HStreamDB: