Database

RDBMS – Relational database management system is used for the last decades as the main data platform to store the company’s critical operational, business, and transaction data.

Relational databases are known for their safe transaction mechanism as data is saved persistently when it’s being saved/committed. Data is being saved in tables with a predefined structured schema containing columns from different data types. The table presents a business entity like Orders, Order Items, Items, etc. The idea of relational databases is that every piece of data must be stored once to avoid conflicts between other data tables. When a user/application needs the data he can run SQL Query on several tables using join to link between the data tables to bring one logical record. The table must have a primary key containing one or more columns that define the record’s uniqueness. Primary keys are used to prevent duplicate data in the table and a way to join between tables (entities). A relational database is also known for its data integrity so data will be stored clean, according to business rules and without duplication. To do that every relational database must  have the following constraints to keep the data integrity :

  • Primary Key – Define the record uniqueness 
  • Unique Key – define column uniqueness but can contain nulls
  • Foreign Key – column or column values must exist in related tables.
    For example: in orderItems, the orderID must exist in Orders Table
  • Check constraints – available values the column can have 

To enable queries to run fast on large tables databases are using indexes that are created on one or more columns with high cardinality where users can filter or sort by. 

Relational databases also use stored procedures and functions to enable running database routines from the database itself. These objects are used to run heavy transactional operations inside the database to avoid large network traffic latency between clients and servers and run the operations close to the data inside a strong database server. Stored procedures are also used as the single point of business logic that all application components can use.

Triggers can also be used on tables to trigger another action when data is changed on the table. 

 

SeaData specializes in open source and cloud databases and provides consulting services and projects in the worlds of DBA and Data Engineering to the leading companies in Israel and the world.

Our great expertise is reflected in large databases as well as a large number of transactions and high data volumes

The databases in which we are experts:

MySQL

MySQL is a free open source relational database management system under the terms of the GNU General Public License.

It’s one of the most popular databases in the market and is used by very large companies such as Facebook and booking.com and more.

It supports ACID (Atomicity, Consistency, Isolation, Durability). It’s highly stable, reliable, and can scale to 10K’s of concurrent reads and writes per second very easily.

Read more About MySQL 

PostgreSQL

PostgreSQL is free open Source relational database management with the ability to handle Data Warehouses or Online Applications such as web and mobile applications.

PostgreSQL supports ACID ( Atomicity, Consistency, Isolation, Durability) with very rich functionality as any Enterprise Database. It has features like Materialized view, Analytic functions, Parallel queries, etc.

Read More About PostgreSQL

Oracle

Oracle Database is licensed Relational database management used to run on a mixed load of online transaction processing and data warehouse.

Oracle is known for its high reliability, high availability, and rich functionality.

Oracle is mainly used in Enterprise corporations like Banks, credit card companies, Insurance companies, etc.

Read More About Oracle

SQL Server

Microsoft SQL Server is licensed Relation database management used to run on a mixed load of online transaction processing and data warehouse.

SQL Server is mainly installed on Windows Operating system although it started to support Linux as well.

SQL Server initially was ported from Sybase ~1989 and was first released in 1993 (Version 4.2).

SQL Server is very fast, reliable, and rich with functionality that makes it one of the most popular databases for companies based on Windows server operating systems.

Read More About SQL Server

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