ALEXANDRIA, Va., March 19 -- United States Patent no. 12,253,994, issued on March 18, was assigned to NASDAQ INC. (New York).

"Dynamically selecting among learned and non-learned indexes for data access" was invented by Jonathan Rivers (Brighton, Mass.), Douglas Hamilton (Boston) and Leonid Rosenfeld (Brookline, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "The described technology relates to systems and techniques for accessing a database by dynamically choosing an index from a plurality of indexes that includes at least one learned index and at least one non-learned index. The availability of learned and non-learned indexes for accessing the same database provides for flexibility in accessing the da...