Test - Postgresql - Data Querying

Tester of the Postgresql ability of querying speed on series data

Repository Structure

• build/, containing the generated .class files after compiling the java code;
• logs/, containing the log information of the queries executed;
• resources/, containing the PostgreSQL driver, the database credentials file and the logger properties;
• src/, containing the java source files;
• standalone/, containing the JAR standalone version of this repository.

In the main directory, there is:

• compile_and_run.bash, a bash file containing the commands for compiling the java code and running it.

Requirements

• PostgreSQL JDBC Driver (42.2.14)

Installation and running the project

• Create the folder build;
• Create the folder logs;
• Inside the folder resources,
  • Create a file called server_postgresql_credentials.txt, containing the username (first line) and the password (second line) to access the server PostgreSQL database;
  • Copy-paste the indicated PostgreSQL driver (called postgresql-42.2.14.jar);
• Execute bash compile_and_run.bash

Preparing an executable jar file

Since I couldn't manage to find a way with the command line, I used Eclipse:

• Create the folder standalone;
• Open the project in Eclipse;
• Set Java 8 as the default JRE:
  • Window > Preferences > Java > Installed JREs;
  • Select Java 8;
  • Apply and Close;
• Set Java 8 as the compiler version:
  • Window > Preferences > Java > Compiler;
  • Compiler compliance level: 1.8;
  • Apply and Close;
• Create the JAR file:
  • Right-click on the project folder > Export;
  • Java > Runnable JAR file > Next;
  • Launch Configuration: Main;
  • Export destination: test_postgresql_data_querying/standalone/DataQueryingTest.jar;
  • Finish.
• Execute the JAR file:
  • If you have this repository available:
    • From the main directory, execute java -jar standalone/DataQueryingTest.jar.
  • If you need a proper standalone version:
    • Check the next paragraph.

Preparing the standalone version on the server

• Connect to the unibz VPN through Cisco AnyConnect;
• Open the terminal:
  • Execute ssh -t sfracalossi@ironlady.inf.unibz.it "cd /data/sfracalossi ; bash";
  • Execute mkdir postgresql;
  • Execute mkdir postgresql/standalone_query;
  • Execute mkdir postgresql/standalone_query/resources;
• Send the JAR and the help files from another terminal (not connected through SSH):
  • Execute scp standalone/DataQueryingTest.jar sfracalossi@ironlady.inf.unibz.it:/data/sfracalossi/postgresql/standalone_query;
  • Execute scp resources/server_postgresql_credentials.txt sfracalossi@ironlady.inf.unibz.it:/data/sfracalossi/postgresql/standalone_query/resources;
  • Execute scp resources/logging.properties sfracalossi@ironlady.inf.unibz.it:/data/sfracalossi/postgresql/standalone_query/resources;
• Execute the JAR file (use the terminal connected through SSH):
  • Execute cd postgresql/standalone_query;
  • Execute nohup java -jar DataQueryingTest.jar [l/s] [test_table/test_table_n] > logs/out.txt &.