Comparison: MySQL vs Redis

Modified date: Monday, June 30, 2025

Table of Contents

Introduction
General
Data Types
SQL
Storage and System
Benchmarking
Tools
Export Regulations
Internal
Internal - Optimizer
Internal - Runtime
Internal - Storage Engine

General

Feature	MySQL	Redis	Definition
intro	MySQL is an open source relational database management system (RDBMS) that’s used to store and manage data.	Redis (REmote DIctionary Server) is an open source, in-memory, NoSQL key/value store that is used primarily as an application cache or quick-response database.	in their own words - but I reserved the rights to remove some bold claims like "the best", unless it is widely recognized.
vendor	Oracle	Redis
initial release	1995	2009
latested version	9	8	We don't put a release date here as the software is patching frequently. So tracking it is not much useful.
db-engines ranking	2	7	ranks from https://db-engines.com/en/ranking (06/25)
relational?	yes	no	Is it a relational database? (1) Most database are actually with some extensions, for example, nested data types, graph support, etc, which we usually called "multi-model". (2) Some of them are product family, meaning they have more than one database. Here we focus on the main one but explain others when needed.
open source?	yes	yes/no	mainly the engine code
license	commerical, GNU a dual-license model: an open-source license (GPL) and commercial licenses	Tri-licensing model Starting with Redis 8, Redis Open Source is moving to a tri-licensing model with all new Redis code contributions governed by the updated Redis Software Grant and Contributor License Agreement. After this release, contributions are subject to your choice of: (a) the Redis Source Available License v2 (RSALv2);or (b) the Server Side Public License v1 (SSPLv1); or (c) the GNU Affero General Public License v3 (AGPLv3). Redis Open Source 7.2 and prior releases remain subject to the BSDv3 clause license.
price: box software	$0 ~ $32,100 (2023) MySQL pricing by edition (annual subscriptions): （1）Community Edition: Open-source and free — from $0 (2) Standard Edition: Starts at $2,140/year for a two-core server; can scale up to $12,840/year as you add more cores portable.io (3) Enterprise Edition: Starts at $5,350/year for two cores; increases up to $32,100/year depending on core count
on-premise offering	yes	yes	if no means you can't buy "box" software from them
cloud offering	None	Redis Cloud
technical doc	https://dev.mysql.com/doc/	https://redis.io/docs/latest/
supported platforms		RHEL, Ubuntu, Amazon Linux Here is the Redis Enterprise version. The open source one shall be runnable on *BSD, Linux, MacOS.	supported OS/CPU platforms

SQL

Feature	MySQL	Redis	Definition
SQL: standard complaince	medium	No SQL
PL: main	SQL + SP		main programming lanage: most database suports SQL because SQL is a well established standard. However, each database would like to extend SQL more or less.
PL: other language support	no		PL lanaguage other than PL/SQL, like PL/Java, PL/Rust etc
Object-Relational?	no
vector search	no native		does it support vector search
SQL: extensions		There are multiple open source projects to add SQL support on top of Redis. For example, RediSQL.
Extension Mechanism		Redis Modules API

Storage and System

Feature	MySQL	Redis	Definition
arch: server	C/S	C/S	Embedded or traditional C/S?
arch: run in browser?	no	no	It also known as a client-side database, is a database that is stored and managed within a user's web browser, rather than on a remote server.
arch: Multi-master support?	no		if multi-master support?
arch: primary/read replica?	yes		if primary + mulitiple read replica supported
replication: sync/async	both		Can commits wait or w/o wait for replicas to acknowledge
ACID	yes/atomic DDL (non-transactional) Atomic DDL is not transactional DDL. DDL statements, atomic or otherwise, implicitly end any transaction that is active in the current session, as if you had done a COMMIT before executing the statement. This means that DDL statements cannot be performed within another transaction, within transaction control statements such as START TRANSACTION ... COMMIT, or combined with other statements within the same transaction.		for DML and DDL
ACID: durability	yes	yes
Materialized View: support?	no	no

Benchmarking

Feature	MySQL	Redis	Definition
any official TPC benchmarks?	no	no	The TPC benchmark includes a set of tests simulating real-world scenarios to evaluate database performance.

Tools

Feature	MySQL	Redis	Definition
command line client	mysql	redis-cli	it means "sql client" for database supporting SQL. For embedded atabase, the client includes the server together.
admin(GUI)	MySQL workbench

Export Regulations

Feature	MySQL	Redis	Definition
Jurisdiction	US	US	Which country controls export
ECCN	None	None	An Export Control Classification Number (ECCN) is a five-character alphanumeric code used to categorize items on the Commerce Control List (CCL) for export control purposes. Most database may fall into 5D992.c category, "mass market encryption", which means it has some ordinary encryption related code, for example, the SSL connection code.
Eligible License Exception / CCATS	Not required There is no ECCN for open source software	Not required There is no ECCN for open source software	A License Exception is an authorization that allows you to export or reexport items subject to the EAR without needing to obtain a specific export license, provided certain conditions are met. CCATS stands for Commodity Classification Automated Tracking System. The BIS assigns a CCATS number to products that it has classified under the Commerce Control List (CCL).
Encryption Components	SSL	SSL	Crypto functionality that triggers control

Internal

Feature	MySQL	Redis	Definition
concurrency control	InnoDB: MVCC
MVCC: implemented?	yes		if implement MVCC for concurrency control
MVCC: rollback segment	yes MySQL supports multiple storage engines, with InnoDB is popular. So we focus on InnoDB here.		if uses rollback segment (RS) to store old versions. Without RS, old versions and new versions are mixed stored, then the database engine has to find a way to efficiently drop the old versions at certain point.
Implementation language	C++		A DBMS may use mulitple programming languages, for example, supports its stored procedure. The major programming language used to implement the engine.

Internal - Optimizer

Feature	MySQL	Redis	Definition
CBO?	yes		if it employees a cost based optimizer
framework	System-R		System-R is more like a dynamic programming, bottom up optimizer, while Cascades/Volcano gebaseerd optimizer is more like top-down optimizer.
stats: multi column	no		Multi-column stats may cause storage space bloat: for example, if one dimension has 100 buckets, then three dimensions will require 1M buckets - but reducing the total number of buckets will result in reduced accuracy.
plan guide?	no		Can we use plan guide to correct the plan? This is a more systematic and accurate way to repair the plan than plan hints. Especially during system upgrades, if the plan becomes worse, we can use plan guide to force a query to use a previous plan.

Internal - Runtime

Feature	MySQL	Redis	Definition
spilling support	yes		"spilling" refers to the process of writing temporary data or intermediate results of a query to disk when the available memory is exhausted. This is crucial for handling large datasets or complex queries that require more memory than available.
model	Volcano		The operator scheduling model: pull-gebaseerd (Volcano), push etc.
support intra-parallel query?	no		meaning a single query can utilize multi hardware threads to run it
adaptive execution (AQP)?	no		Traditionally, after the optimizer determines the plan, the runtime must execute it completely without any room for adjustment, such as which of the two tables should be built. The adaptive method allows the runtime to make some adjustments based on the actual situation, and the optimizer must also prepare for this uncertainty, such as preparing an alternative plan.
vectorization	no native. HeatWave supports it (not open source).		Speed up OLAP queries using vectorized execution. A vectorized runtime exchange a bunch of rows between iterators, and these rows are physically sotre with column-oriented order.
iterator: join methods	except MJ		Hash Join (HJ), Sort-Merge Join (MJ) and Nested loop Join (NLJ) are 3 major ones
Error: out-of-range and overflow	strict mode: abort. Non-strict mode: continue with warning.		To maintain atomic requirement of ACID, database engine usually fail the statement and abort the transaction.

Internal - Storage Engine

Feature	MySQL	Redis	Definition
Page Size	4K, 8K, 16K, 32K, 64K Every tablespace in a MySQL instance has the same page size. By default, all tablespaces have a page size of 16KB; you can reduce the page size to 8KB or 4KB by specifying the innodb_page_size option when you create the MySQL instance. You can also increase the page size to 32KB or 64KB.		The physical disk block size for storage and I/O.
Storage Compression	ROW_FORMAT=COMPRESSED
ACID: durability mechanism	InnoDB: WAL	AOF	How is it implements durability. Database's classic way is write ahead logging (WAL).