This version of ScalarDB is no longer supported. We recommend that you update to the latest version of ScalarDB.

Scalar DB


Scalar DB is a universal transaction manager that achieves:

  • database/storage-agnostic ACID transactions in a scalable manner even if an underlying database or storage is not ACID-compliant.
  • multi-storage/database/service ACID transactions that can span multiple (possibly different) databases, storages, and services.


The library is available on Maven Central. You can install it in your application using your build tool such as Gradle and Maven.

To add a dependency on Scalar DB using Gradle, use the following:

dependencies {
    implementation group: 'com.scalar-labs', name: 'scalardb', version: '3.4.9'

To add a dependency using Maven:




This library is mainly maintained by the Scalar Engineering Team, but of course we appreciate any help.

  • For asking questions, finding answers and helping other users, please go to stackoverflow and use scalardb tag.
  • For filing bugs, suggesting improvements, or requesting new features, help us out by opening an issue.

Here are the contributors we are especially thankful for:


Scalar DB is dual-licensed under both the Apache 2.0 License (found in the LICENSE file in the root directory) and a commercial license. You may select, at your option, one of the above-listed licenses. The commercial license includes enterprise-grade tools, such as a multi-table consistent backup/restore tool for Cassandra. Regarding the commercial license, please contact us for more information.