olemus
andmebaasihalduri komponent, ülesandeks
andmete tegelik salvestus, võtt, uuendus ja kustutus,
enamasti on võimalik eraldi kasutada
andmebaasihalduri rakendusliidese kaudu

Wiktionary:
the underlying component that a database management system uses to create, retrieve, update and delete data

ülevaateid
https://www.techopedia.com/definition/1188/database-engine

https://image.slidesharecdn.com/databaseengine-13316327496315-phpapp02-120313050124-phpapp02/95/database-engine-2-1024.jpg

https://en.wikipedia.org/wiki/Database_engine

https://hackernoon.com/how-sql-database-engine-work-483e32o7

https://medium.com/@grepdennis/how-a-sql-database-engine-works-c67364e5cdfd

näiteid
https://www.kdnuggets.com/2016/06/top-nosql-database-engines.html

https://dc.etsu.edu/cgi/viewcontent.cgi?article=2271&context=etd