Odd that they chose MySQL, when they were previously using Postgres. In particular, Postgres&#x27; JSON support is so extensive (including indexing, which now is even more extensive [1]), and offers performance benefits over MySQL.<p>The advantage of MySQL in this situation is probably the support for multimaster replication.<p>[1] <a href="http:&#x2F;&#x2F;pgxn.org&#x2F;dist&#x2F;jsquery&#x2F;" rel="nofollow">http:&#x2F;&#x2F;pgxn.org&#x2F;dist&#x2F;jsquery&#x2F;</a>