What is the best database for eCommerce?
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PostgresSQL
MongoDB
I'm much less inclined to mention products here, and more about having proper database management and DBA expertise available to support the database. You can use a technology that seems to match your workload best while still lacking in proper support, hardening, modelling and the like, resulting in a failed product and operational stability overall.
Furthermore, if you seek out an eCommerce software product, they will mention what databases they support - or even provide as part of the package, although that will get your DBAs to sigh and roll their eyes a bit, as such delivered database engines are often not sufficiently tailorable to the setup and support structure that your DBA team has in place.
Mongodb and PostgreSQL mostly works
I've worked in a huge eCommerce company.
MySQL or MariaDB to support the eCommerce front end.
PostgreSQL for sales interface.
Couchbase for unstructured data.