Mycat2 vs OceanBase Database

Mycat2 is free, open-source distributed relational database middleware for Linux and self-hosted deployment. It supports distributed SQL queries and the MySQL communication protocol while connecting to multiple backend databases through the Java ecosystem. Its query engine handles MySQL syntax and value types, rule- and cost-based optimization, and an independent physical execution engine. Data fragmentation is described as improving query processing. Users can customize and load sharding, serial-number and load-balancing algorithms. A project DSL manipulates physical query plans, forwards SQL and caches result sets. The README currently supports Java 8 only. Release notes for v1.22-2022-6-25 list ClickHouse as a backend for SELECT and INSERT, without returning auto-increment values. They also describe SQL permission interception, RSA encryption for user.json, and recycling inactive backend connections after a default 180-second timeout. The repository identifies an Apache License from 2023.8.

OceanBase Database is a distributed database for transactional, analytical, and AI workloads in one system. Built-in compatibility with Oracle and MySQL is intended to simplify migration. Deployment choices include the open-source Community Edition, self-hosted Enterprise, and fully managed OceanBase Cloud across cloud providers. Documentation describes high availability and disaster recovery at node, data-center, and region levels. Linux installation packages are listed for Alibaba Cloud Linux, CentOS, Red Hat, Ubuntu, Debian, and Anolis OS. Docker deployment can be used on Windows and macOS, though the documentation cautions that this method has not been validated at scale. A standalone instance can be used for learning; production environments require at least three servers. Community Edition is free and includes full kernel capabilities. Enterprise pricing is available on request. Security features include role and permission management, network whitelists, encrypted communication, transparent data encryption, and SQL auditing, but Community Edition does not support security audit.