Limits

The tables below provide guidance on HSE operating limits. A few are enforced, but most are based on testing and experience.

The limits appropriate for a specific HSE application are largely dependent on the performance requirements of that application, and the hardware it runs on.

Feel free to push these limits in testing and let us know how far you get and what you observe.

KVDB Limits

Entity	Description	Limit	Enforced
KVDB count	Active KVDB per system	8	No
KVS count	KVSs in a KVDB	16	No
Key count	Total keys in a KVDB (billions)	200	No
Capacity	Total storage capacity of a KVDB (TB)	12	No
Transaction count	Concurrent transactions in a KVDB	1,000 per CPU	Yes
Cursor count	Concurrent cursors in a KVDB	10,000	No

Info

An application can only have a single KVDB open at a time. We expect to remove this limitation in a later release.

KVS Limits

Entity	Description	Limit	Enforced
Key size	Range of valid key sizes (bytes)	1 – 1,334	Yes
Value size	Range of valid value sizes (bytes)	0 – 1MiB	Yes
Key count	Total keys in a KVS (billions)	50	No
Capacity	Total storage capacity of a KVS (TB)	4	No
Cursor count	Concurrent cursors in a KVS	8,000	No