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Binary Schema Evolution

With eXtremeDB High Availability, Binary Schema Evolution (BSE) is used to implement “in-place” upgrades that involve changes to the database structure in running systems, without interrupting the availability of the system.

The high level concept is as follows:

  1. Install version N+1 of the system as a replica
  2. Connect the replica to the running master
  3. Master synchronizes the N+1 replica database, accommodating database changes along the way
  4. Upon completion of the synchronization:

A.  N+1 replica switches to master
B.  Version N former master shuts down

 

BSE can accommodate:

  • The presence of new and dropped classes
  • New fields and dropped fields
  • New indexes and dropped indexes
  • Changes to indexes
  • Changes to field types that don’t lose precision
Learn about High Availability
Flow chart of Binary schema evolution

eXtremeDB High Availability is a fault-tolerant version of eXtremeDB® designed to answer the challenge, “How can a database survive the failure of the software or hardware environment in which it operates?” Designed to power systems that cannot afford to fail, eXtremeDB-HA delivers the highest degree of reliability, along with its unsurpassed performance and exceptionally small footprint.