Checking run time characteristics according to the handling of customised indexes

Hello, Some indexes are generally supported also by the software “BaseX”. https://docs.basex.org/wiki/Indexes Some data processing approaches would usually depend on indexes for primary and foreign keys. https://en.wikipedia.org/wiki/Primary_key How much do run time characteristics influence data transfers (and conversion of corresponding data structures) for the available indexing technologies? Regards, Markus