18. The system of claim 14 , wherein the processor is further configured to: determine the datastore of the plurality of datastores, based at least partly on data retrieval latency information for the datastore, and on the storage metadata indicating that data for the at least one data attribute identified by the normalized attribute identifiers is stored in the datastore, the determining of the datastore further based on data quality information indicating a quality of the data stored in the datastore.
18. The system of claim 14 , wherein the processor is further configured to: determine the datastore of the plurality of datastores, based at least partly on data retrieval latency information for the datastore, and on the storage metadata indicating that data for the at least one data attribute identified by the normalized attribute identifiers is stored in the datastore, the determining of the datastore further based on data quality information indicating a quality of the data stored in the datastore. 19. The system of claim 18 , wherein the determining of the datastore is further based on time estimates.