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kdb+4.0 released

New Contributor II
New Contributor II
Kdb+ 4.0 (formerly 3.7t) has now reached production status and is available on

Highlights include:
  • Multithreaded primitives
  • Data at rest encryption
  • Profiler
  • Optane Support
  • Debugger enhancements 
An executive summary of features can be found at

Suggested upgrade process
Even though we have run a wide range of tests on V4.0, and various customers have been kind enough to repeatedly run their own tests during the last few months of development, customers who wish to upgrade to V4.0 should run their own tests on their own data and code/queries before promoting to production usage. In the event that you do discover a suspected bug, please email

kind regards,