Databases Reference
In-Depth Information
determining when to make an investment. This function is sometimes described as
providing MapReduce-like functionality in the Oracle Database as it greatly simplifies
pattern-matching coding and the maintenance of such code.
The MATCH_RECOGNIZE clause typically is used to perform a PARTITION BY to
identify a data item of interest (such as a company name) and ORDER BY to order each
row partition. Then it will search each row for matches in a defined PATTERN by
incrementally looking for the match row by row. It calculates the row pattern measure
columns after a match is found (as defined by MEASURES). It will report ONE ROW
PER MATCH or ALL ROWS PER MATCH depending on which is specified, and uses
AFTER MATCHES SKIP to determine where to continue to look for row pattern
matches after a match is found.
Advanced Analytics Option
The Advanced Analytics Option consists of Oracle R Enterprise and Oracle's former
Data Mining Option. This option, first available in 2012, enables advanced statistics and
data mining algorithms to be applied to data residing in an Oracle Enterprise Edition
Database.
R
is the increasingly popular open source programming language for statistical analysis
and graphical display. First developed in 1994, R became popular in universities in the
past decade and there are now over 2 million users.
Oracle R Enterprise is an embedded component of the Oracle Database available for
Linux and several other popular operating systems. Workstation memory constraints
and scalability are removed since R scripts and the development environment (RStudio)
take advantage of the power of the database platform during data preparation, model
development, and model deployment. Oracle R Enterprise includes an R-SQL package
transparency framework providing transparent database table access and in-database
execution, a database library statistics engine, and SQL extensions enabling in-database
execution of R code. Any CRAN open source packages can be run in the database either
via Oracle R Enterprise to SQL function pushdown or in native R mode. The Oracle
Database statistics engine includes R support for:
• Density, probability, and quantile functions
• Special functions (such as Gamma functions)
• Tests (such as Chi-square, simple & weighted kappas, and correlation)
• Base SAS equivalents (such as frequency, summary, sort, rank, and others)
Data mining
, an often overused and misunderstood term in data warehousing, is the
use of mathematical algorithms to model relationships in the data that wouldn't be
apparent by using other tools. Most companies shouldn't approach data mining unless
analysts have met the following criteria:
