Database Reference
In-Depth Information
AllegroGraph 7 is a high-performance, persistent graph database which e-
ciently utilizes memory in conjunction to disk-based storage to scale to billions of
quads without compromising performance. It is offered via standalone, clustered
and cloud-based versions. It fully supports SPARQL, exploits 7 indices for triple
storage and exhibits advanced text indexing per predicate, while a column-based
compression of indices is also imposed for reduced paging and better perfor-
mance. Concerning the geo-spatial support, it provides a novel mechanism for
ecient storage and retrieval of 2D geo-spatial data by also supporting both
Cartesian and spherical coordinate systems.
BigData 8 is a horizontally scaled storage and computing fabric featuring
high concurrency and high aggregate I/O rates. It is offered in a standalone or
clustered mode. It includes a RDF database which supports RDFS and performs
distributed operations on a cluster with dynamic key-range sharding of indices.
This database also supports full-text indexing suitable for entity matching and
integration hooks for full text search and indexing using Lucene. Basic geospatial
support has been recently advertized through the creation of a new geospatial
index and the use of one and many Z-values for points and regions, respectively.
OWLIM 9 is a family of semantic repositories which exploit native RDF
engines developed in Java as well as Sesame and Jena for RDF management
and guaranteeing high-performance levels. It is offered via different versions: a
standalone, a clustered and a cloud-based one. The clustered version of OWLIM
(OWLIM-SE) exploits file-based indices in order to scale to billions of state-
ments. A literal index is also built for faster lookups of numeric and date/time
object values, while index compression can also be switched on. OWLIM-SE
supports 2D spatial data which use the WGS84 Geo Positioning RDF Vocab-
ulary, while R-Tree indices are created for these data to allow the evaluation
of particular query types which exploit particular topological relation functions.
Only spherical Coordinate Reference Systems (CRSs) are supported.
Virtuoso 10 is a middleware and database engine hybrid combining the func-
tionality of R/ODBMS, RDF Stores, and Web Application and File Servers. It
is offered via three variants: (a) standalone, (b) clustered, and (c) cloud-based.
The current version of Virtuoso employs a column-based indexing scheme. Two
main indices are created on RDF data as well as three partial indices. Strings
are given a unique Integer ID to save space but also to keep a full text index of
them. Geometries are represented as object values in an RDF quad conforming
to the WKT vocabulary and are indexed through R-Trees. Only 2D geometries
are currently supported.
Oracle 11 provides an open, scalable, secure and reliable RDF management
platform called Oracle Spatial and Graph RDF Semantic Graph. Oracle performs
7 www.franz.com/agraph/allegrograph/ .
8 www.systap.com/bigdata.htm .
9 www.ontotext.com/owlim&www.ontotext.com/owlim/geo-spatial .
10 http://virtuoso.openlinksw.com .
11 http://www.oracle.com/technetwork/database-options/spatialandgraph/overview/
rdfsemantic-graph-1902016.html .
Search WWH ::




Custom Search