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The default database of user manager is the H2 database that comes with WSO2 products. You can configure it to point to databases by other vendors.
classpath
by dropping the JAR into <PRODUCT_HOME>/repository/components/lib
.<PRODUCT_HOME>
/dbscripts
and restart the server: sh wso2server.sh
or sh wso2server.sh
wso2server.bat
or wso2server.bat