greg/stasis-aries-wal
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

sec2

Browse source
This commit is contained in:
Eric Brewer 2006-08-12 21:35:22 +00:00
parent f706cb6d22
commit 22ae1ab5de
1 changed files with 4 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
doc/paper3/LLADD.tex
View file

@ -228,9 +228,9 @@ database systems and research projects for at least 25 years.
Database systems are often thought of in terms of the high-level
abstractions they present. For instance, relational database systems
implement the relational model~\cite{codd}, object oriented
databases implement object abstractions, XML databases implement
hierarchical datasets, and so on. Before the relational model,
implement the relational model~\cite{codd}, object-oriented
databases implement object abstractions \eab{[?]}, XML databases implement
hierarchical datasets~\eab{[?]}, and so on. Before the relational model,
navigational databases implemented pointer- and record-based data models.
An early survey of database implementations sought to enumerate the
@ -257,7 +257,7 @@ transactions (OLTP), the physical model would probably translate sets
of tuples into an on-disk B-Tree. In contrast, if the database needed
to support long-running, read only aggregation queries (OLAP) over high
dimensional data, a physical model that stores the data in a sparse array format would
be more appropriate~\cite{molap}. While both OLTP and OLAP databases are based
be more appropriate~\cite{molap}. Although both OLTP and OLAP databases are based
upon the relational model they make use of different physical models
in order to serve different classes of applications.}