Updating the crowd.cfg.xml file is not the right way to do what you want to do.
Here is a link to Atlassian's documentation regarding Crowd migration to another database: https://confluence.atlassian.com/crowd/migrate-to-another-database-180290495.html
So here is what you must do:
A bit of a late reply, but hopefully this might help others too. While the XML option is what's documented, we've done numerous database migrations in the past for Crowd between mysql > mysql and later psql > psql (standard dump and restore) and updated the connector in the crowd.cfg.xml file and the process worked well. Given it's easier to script a DB dump - we use this then push offsite as part of our DR/BC process.
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