Amazon Neptune
User Guide (API Version 2017-11-29)

Amazon Neptune Engine Updates 2018-09-06


Amazon Neptune is generally available. All new Neptune DB clusters, including those restored from snapshots, will be created in Neptune once the engine update is complete for that region.

Updates are applied to Neptune DB clusters during system maintenance windows. The timing when updates are applied depends on the region and maintenance window setting for the DB cluster, as well as the type of update.


The instance maintenance window does not apply to engine updates.

Updates are applied to all instances in a DB cluster simultaneously. An update requires a database restart on all instances in a DB cluster, so you will experience 20 to 30 seconds of downtime, after which you can resume using your DB cluster or clusters. You can view or change your maintenance window settings from the

Should you have any questions or concerns, the AWS Support Team is available on the community forums and through AWS Premium Support.


  • Fixed an issue where some SPARQL COUNT(DISTINCT) queries failed.

  • Fixed an issue where COUNT, SUM, MIN queries with a DISTINCT clause would run out of memory.

  • Fixed an issue where BLOB type data would cause a Neptune Loader job to fail.

  • Fixed an issue where duplicate inserts would cause transaction failures.

  • Fixed an issue where DROP ALL queries could not be cancelled.

  • Fixed an issue where Gremlin clients could hang intermittently.

  • Updated all error codes for payloads bigger than 150M to be HTTP 400.

  • Improved performance and accuracy of single-triple-pattern COUNT() queries.

  • Improved performance of SPARQL UNION queries with BIND clauses.

On this page: