Key-Value Stores, such as Redis, DynamoDB, and Cosmos DB, are: For example, MongoDB uses a key value store called WiredTiger as their default storage engine. Key-value stores are often used as the underlying storage for higher level databases. While databases are typically categorized as SQL or NoSQL, there are many intricacies to NoSQL databases. Relational databases have since addressed many of these concerns.Designed to address structure, performance, data volume, and scalability.NoSQL doesn’t mean anything (Non-SQL, Non-relational SQL, Not Only SQL).About 10 years ago the NoSQL movement caught on to address these concerns and changed the database landscape forever. Relational databases are the most common database in production today, but they were not designed for the scale and agility of modern applications. There are several awesome use cases for relational databases situations where data integrity is absolutely paramount (financial applications, defense and security, private health information), highly structured data, and automation of internal processes. Note: While some RDBMS systems can now handle JSON, they are not purpose built to do so. However on the negative side, SQL databases cannot handle unstructured or semi-structured data, their tables don’t necessarily map to objects, they require complicated ETL (Extract, Transform, Load) and maintenance, have row locking, and pricing for some products (Oracle, SAP) are out of reach for developers and some organizations. On the plus side, relational databases use mature technology that is widely understood and well-documented, SQL standards are well-defined, defined constraints enforce data integrity, they avoid data duplication and are highly secure and ACID-compliant. Extra features like Triggers & Stored Procedures.ACID compliance (Atomicity, Consistency, Isolation, and Durability).Data accessed via Structured Query Language (SQL).Relationships between tables are defined through foreign keys which reference primary keys.Rows are identified with a unique attribute, or grouping of attributes, called a primary key (typically a single column).Relational (SQL) Databases such as Oracle, MySQL, PostgreSQL, Microsoft SQL Server, and SQLite, organize data into tables with columns, each with a specified name and datatype. Now, For the Part You’ve Been Waiting For: D atabase Architectures. Servers are maintained by cloud providers, organizations maintain database software and operating system running on the machineįlexible scaling and no server upkeep, but no control over physical server and potential network limitationsĭatabase maintained by service provider, organizations only charged for usage of serviceĬost effective and zero upkeep, but data stewardship and potential network limitations More control, but usually more expensive and time consuming You may already know that there are generally 3 database hosting options:ĭatabase fully maintained by organization on servers running within their data center(s) The more you know about these factors, the easier it will be to pick the right database for your project. It’s important to understand things such as data type / structure, data volume, consistency, write & read frequency, hosting, cost, security, and integration constraints. Let’s start with general considerations when selecting a database. This article will provide an overview of database architectures, including use cases and pros & cons for each of them. You can watch this talk at the link, but since this is such a prominent discussion topic we thought it might be helpful to summarize. In most cases, it’s not that one database is better than the other, it’s that one is a better fit for a specific use case due to numerous factors.Ī couple of months back, our CTO Kyle Bernhardy, led an awesome talk titled A Deep Dive Into Database Architectures. NoSQL and other database comparisons all over social media and platforms like dev.to. We continue to see the common debate of SQL vs. With over 300 databases on the market, how do you determine which is right for your specific use case or skill set?
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