Set the default DbProvider to be used by the Scheduler. If set, this will override corresponding settings in Quartz properties.
Note: If this is set, the Quartz settings should not define a job store "dataSource" to avoid meaningless double configuration.
A Spring-specific subclass of Quartz' JobStoreSupport will be used. It is therefore strongly recommended to perform all operations on the Scheduler within Spring-managed transactions. Else, database locking will not properly work and might even break (e.g. if trying to obtain a lock on Oracle without a transaction).