PostgreSQL – Useful Links

PostgreSQLUseful Links

Here are some PostgreSQL references, which may be useful.

Reference Type Link
PostgreSQL Home page & Download https://www.postgresql.org/
PostgreSQL Online Documentation https://www.postgresql.org/docs/manuals/
Citus – Scalability and Parallelism Extension https://github.com/citusdata
Free PostgreSQL Training https://www.enterprisedb.com/free-postgres-training

Related References

The Business Industries Using PostgreSQL

PostgreSQL is an open-source database, which was released in 1996. So, PostgreSQL has been around a long time.   So, among the many companies and industries which know they are using PostgreSQL, many others are using PostgreSQL and don’t know it because it is embedded as the foundation in some other application’s software architecture.  

I hadn’t paid much attaint to PostgreSQL even though it as been on the list leading databases used by business for years.  Mostly I have been focused on the databases my customer were using (Oracle, DB2, Microsoft SQL Server, and MySQL/MariaDB).  However, during a recent meeting I was surprised to learn that io had been using and administering PostrgresSQL embedded as part of another software vendors application, which made me take the time to pay attention to PostgreSQL. Especially, who is using PostgreSQL and what opportunities that may provide for evolving my career? 

The Industries Using PostgreSQL

According to enlyft, the major using the PostgreSQL are Computer Software and Information Technology And services companies.  

  PostgreSQL Consumers Information

Here is the  link to enlyft page, which provides additional information companies and industries using PostgreSQL:

Related References

The Most Important Databases In Business

If you are looking to learn a Structured Query Language (SQL) skills and have marketable database knowledge, then it is time to talk about which are the most important business databases.

Why Learn The Most Important Databases Used By Business Are?

Well, I assume that you are reading this article with an eye toward improving your employment prospects.   If improving your employment prospects is what you are after, then why waste time learning databases skills, learning advanced SQL language chrematistics of a database, or get after a certification, which will have a small market?  The most important or most used databases, if you like, to business will likely be where the most work opportunities will be no matter whether you plan to be a company employee, independent contractor, consultant or like me have moved through all of these at one time or another.

Focus On Market Opportunity

The top five databases have a solid 85% of the market, so, this allows a person to build their skill is a database which will have employment opportunities.  While there are non-business users of databases of other databases not discussed here, most of us will, thorough out our careers, be working in work for or with business to earn our living.  

The Top Five Database Most Popular In Businesses

Now to the heart of this article, in 2019 the top five databases used in a business are listed in order of most popular to least popular are:

Database Name Percent of market
Oracle 25.31%
MySQL 24.04%
Microsoft SQL Server 20.39%
PostgreSQL 9.06%
MongoDB 7.71%

Related References

Databases – Database Isolation Level Cross Reference

Database Type Isolation Levels Cross Reference
Database And Tables

 

Here is a table quick reference of some common database and/or connection types, which use connection level isolation and the equivalent isolation levels. This quick reference may prove useful as a job aid reference, when working with and making decisions about isolation level usage.

Database isolation levels

Data sources

Most restrictive isolation level

More restrictive isolation level

Less restrictive isolation level

Least restrictive isolation level

Amazon SimpleDB

Serializable Repeatable read Read committed Read Uncommitted

dashDB

Repeatable read Read stability Cursor stability Uncommitted read

DB2® family of products

Repeatable read Read stability* Cursor stability Uncommitted read

Informix®

Repeatable read Repeatable read Cursor stability Dirty read

JDBC

Serializable Repeatable read Read committed Read Uncommitted

MariaDB

Serializable Repeatable read Read committed Read Uncommitted

Microsoft SQL Server

Serializable Repeatable read Read committed Read Uncommitted

MySQL

Serializable Repeatable read Read committed Read Uncommitted

ODBC

Serializable Repeatable read Read committed Read Uncommitted

Oracle

Serializable Serializable Read committed Read committed

PostgreSQL

Serializable Repeatable read Read committed Read committed

Sybase

Level 3 Level 3 Level 1 Level 0

 

Related References