Recs.
Updated
SpecsUpdate
Pros
Pro Extensive documentation
VoltDB documentation is very extensive. It provides examples and tutorials starting from the basic to its advanced features. It also provides best practices and guides for improving performances. This means that its documentation is beginner friendly while retaining extensive documentation for advanced users who wants to test its limit.
Pro Open Source
VoltDB has a community edition which is currently licensed under GNU Affero General Public License. This means that it is free to use. You are also allowed to customize its features or add plugins according to your business needs. This is applicable to those who needs cheap solution and flexible customization of database implementation.
Pro Keeps logs of all transaction
It uses synchronous command logging to track all completed transactions even before the data is committed to the database. This ensures that all transactions that are committed into the database are logged. This means that it is impossible for a transaction to be lost.
Cons
Con No prices for other edition
The prices for other editions are not displayed on their website. If you want to upgrade to another edition to get additional features such as support for data replication, export integration to big data analytics and guaranteed no downtime, you will need to contact their customer support for a price quote.