Components of a database management system (from google)
- Storage engine.
- Query language.
- Query processor.
- Optimization engine.
- Metadata catalog.
- Log manager.
- Reporting and monitoring tools.
- Data utilities.
I’d like to say few thinks, and to arrange them (at Oracle)
- all code that manages the engnine
- database languages like SQL, PL/SQL (internal)
- database languages + code that communicate an external language like PRO*C
- tools to write reports, forms like rpt/rpf, Oracle Forms in oracle and more
- monitoring, tuning tools
- tools to import data like SQL*Loader
- backup utilities
- recovery utilities
- security utilities to not loose data (like simulation of Trash Bin)
- software of other companies as cluster Sun Cluster 3.1 (fault tolerant tech like spacecrafts)
- and many more
