How Databases Work -
http://coding-geek.com/how-databases-work/
Implementing Sorting in Database Systems -
http://wwwlgis.informatik.uni-kl.de/archiv/wwwdvs.informatik.uni-kl.de/courses/DBSREAL/SS2005/Vorlesungsunterlagen/Implementing_Sorting.pdf
http://coding-geek.com/how-databases-work/
Implementing Sorting in Database Systems -
http://wwwlgis.informatik.uni-kl.de/archiv/wwwdvs.informatik.uni-kl.de/courses/DBSREAL/SS2005/Vorlesungsunterlagen/Implementing_Sorting.pdf