Fragmenting data for the purposes of persistent storage across multiple immutable data structures

A tangible, non-transitory, machine-readable medium storing instructions that when executed by one or more processors effectuate operations comprising:

• receiving, with one or more processors, one or more write requests to write a plurality of values to a plurality of fields in one or more tuples of a relational database, different ones of the values corresponding to different ones of the fields;
• detecting, with one or more processors, duplicates of the values with steps for expediting detection of duplicates;
• selecting, with one or more processors, a first subset of the values based on the first subset of values corresponding to fields in a first subset of the fields, the first subset of fields being designated as higher-security fields than a second subset of fields among the plurality of fields;
• causing, with one or more processors, the relational database to store the first and the second subsets of the values, wherein:
• the first subset of the values is not written to the relational database in response to the one or more write requests;
• and
• one or more pointers are stored in the relational database in association with the given field of the given tuple to which the one or more write requests request the first value be written.