Skip to content

Heterogeneous-Memory Storage Engine

HSE is a fast embeddable key-value store designed for SSDs and persistent memory. HSE optimizes performance and endurance by orchestrating data placement across DRAM and multiple classes of solid-state storage devices.

HSE is ideal for powering Databases, Software-Defined Storage (SDS), High-Performance Computing (HPC), Internet of Things (IoT), and Machine Learning (ML).

Key Features

  • Rich set of key-value operations
  • Full transactions with snapshot-isolation spanning multiple independent key-value collections
  • Cursors for iterating over snapshot views
  • Data model for optimizing mixed use-case workloads in a single data store
  • Key and value compression
  • Flexible durability controls
  • Configurable data orchestration schemes
  • Native C library that can be embedded in any application


  • Scales to terabytes of data and hundreds of billions of keys per store
  • Efficiently handles thousands of concurrent operations
  • Dramatically improves throughput, latency, write-amplification, and read-amplification versus common alternatives for many workloads
  • Optionally combines multiple classes of solid-state storage to optimize performance and endurance