The Ultimate Guide to High Availability with MariaDB

R Statistical Programming Using MariaDB as the Background Database

  1. Introduction to R
  2. The R Environment
  3. Using R with MariaDB
    1. R Installation
    2. Data Transfer between R and MariaDB
      1. Package: "odbc"
      2. Package: "RMariaDB"
      3. Other Packages: "readr", "RODBC"
    3. R Programming Resources
      1. A) Programming
      2. B) Statistics
      3. C) Cheatsheets: Concept Summary
      4. D) Search Engine & R Package Spotlight
      5. E) Statistical / Unsupervised Machine Learning, Deep Learning and Artificial Intelligence
      6. F) Text Mining
      7. G) Shiny Web Apps & RMarkdown Documents
      8. H) Advanced R Resources

Introduction to R

R is a language and environment for statistical computing and graphics. R provides a wide variety of statistical (linear and nonlinear modelling, classical statistical tests, time-series analysis, classification, clustering, …), graphical techniques, machine learning packages and is highly extensible.

One of R’s strengths is the ease with which well-designed publication-quality plots can be produced, including mathematical symbols and formulae where needed. Great care has been taken over the defaults for the minor design choices in graphics, but the user retains full control.

The R Environment

R is an integrated suite of software facilities for data manipulation, calculation, and graphical display. It includes:

• an effective data handling and storage facility,

• a suite of operators for calculations on arrays, in particular matrices,

• a large, coherent, integrated collection of intermediate tools for data analysis,

• graphical facilities for data analysis and display either on-screen or on hardcopy, and

• a well-developed, simple and effective programming language which includes conditionals, loops, user-defined recursive functions and input and output facilities.

Using R with MariaDB

R Installation

Some basic notions / tips on how to use R along with MariaDB are the following:

A. The recommended R distribution is “Base R”: CRAN

B. The recommended R GUIs are RStudio Desktop, or RStudio Server: RStudio

Alternative GUIs would be:

  • RCode (PGM Solutions): RCode.

“R” and “MariaDB Server” can be installed either in the same server, or in different servers, as an ODBC communication protocol will be used for the exchange of data between the two environments.

Data Transfer between R and MariaDB

Package: "odbc"

For the transfer of data between MariaDB Server and R Environment, it is recommended R's "odbc" Package: CRAN odbc

  • “odbc" is a new R package available on CRAN (Since 2017-02-05), and maintained by RStudio, which is designed to comply with the DBI specification.

The "odbc" package requires to have previously installed the MariaDB or MySQL ODBC connector:

For installing the "odbc" package from CRAN, execute in R:

install.packages("odbc")

Package: "RMariaDB"

“RMariaDB” R library, is a modern 'MariaDB' client based on 'Rcpp'.

For installing RMariaDB package through CRAN, execute the following R statement:

install.packages("RMariaDB")

And for connecting to MariaDB:

library(RMariaDB)

con <- dbConnect(
  drv = RMariaDB::MariaDB(), 
  username = NULL,
  password = NULL, 
  host = NULL, 
  port = 3306
)

Other Packages: "readr", "RODBC"

There are other alternatives for data transfer between R and MariaDB:

  • “readr” R package, for writing / reading CSV files. To be used in MariaDB along with “LOAD DATA INFILE”.
  • "RODBC" R package: Robust and well-tested (Since 2000-05-24) package which enables data transfer between R and MariaDB by means of an ODBC connector: CRAN RODBC
    • It is slightly slower than RStudio's new "odbc" package (See benchmarks): RStudio odbc
    • For bug report to the RODBC package maintainer, use the following R statement: bug.report(package = "RODBC")
    • A vignette on how to use the RODBC package can be found here: RODBC CRAN Vignette

R Programming Resources

A) Programming

Recommended resources for learning how to program in R are the following:

B) Statistics

A recommended book for understanding the underlying statistics in the R packages is:

C) Cheatsheets: Concept Summary

D) Search Engine & R Package Spotlight

E) Statistical / Unsupervised Machine Learning, Deep Learning and Artificial Intelligence

H2O.AI

The R Programming language has support for the H2O.ai library (h2o), which enables to create in-memory multi-cluster GPU powered machine learning models.

For installing H2O.ai through CRAN, execute: 

install.packages("h2o")

The following R Statements can be used for importing a MariaDB table to H2O.ai using the R Front End:

  • import_sql_table: "This function imports a SQL table to H2OFrame in memory".
  • import_sql_select: "This function imports the SQL table that is the result of the specified SQL query to H2OFrame in memory". 
connection_url <- "jdbc:mariadb://172.16.2.178:3306/ingestSQL?&useSSL=false"
username <- "root"
password <- "abc123"

# Whole Table:
table <- "citibike20k"
my_citibike_data <- h2o.import_sql_table(connection_url, table, username, password)

# SELECT Query:
select_query <-  "SELECT  bikeid  FROM citibike20k"
my_citibike_data <- h2o.import_sql_select(connection_url, select_query, username, password)

NOTE: Be sure to start the h2o.jar in the terminal with your downloaded JDBC driver in the classpath:

java -cp <path_to_h2o_jar>:<path_to_jdbc_driver_jar> water.H2OApp

KERAS

R package keras offers an interface to Python's 'Keras', a high-level neural networks 'API'.

'Keras' was developed with a focus on enabling fast experimentation, supports both convolution based networks and recurrent networks (as well as combinations of the two), and runs seamlessly on both 'CPU' and 'GPU' devices.

R LIBRARIES: CARET

A book which introduces core Machine Learning concepts:

F) Text Mining

Documentation on how to perform Text Mining in R can be found in the book "Text Mining With R":

G) Shiny Web Apps & RMarkdown Documents

SHINY WEB APPS

Shiny R Package makes it incredibly easy to build interactive web applications with R.

Automatic "reactive" binding between inputs and outputs and extensive prebuilt widgets make it possible to build beautiful, responsive, and powerful applications with minimal effort.

For deploy Shiny Web Applications using Open Source Alternatives, you can either use:

RMARKDOWN DOCUMENTS

H) Advanced R Resources

Some of the most advanced R resources for fully understanding the internals and nuances of the R Programming Language are the following:

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