Unfortunately, MariaDB is not a supported platform for Crowd at the moment.
There is an open feature request for supporting this type of database here: here https://jira.atlassian.com/browse/CWD-3584. If you are interested in this feature, please watch and vote for this ticket. Customer feedback helps us to shape Crowd future roadmaps.
Is there any particular reason you could not use any of the databases listed in Crowd documentation?
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