Microsoft's Azure Storage Performance Checklist should be considered for performance tips and design guidelines.
A secondary index record was not created by the persister contained in the
NServiceBus. package. To provide backward compatibility, the
NServiceBus. package performs a full table scan across all partitions for secondary index records before creating a new saga. For systems that have only used the
NServiceBus. library, or have verified that all saga instances have a secondary index record, full table scans can be safely disabled by using the AssumeSecondaryIndicesExist setting.