OceanBase vs MySQL
MySQL is the usual starting point for teams that later evaluate OceanBase. The trigger is often write scale, multi-zone HA, or reporting that no longer fits a single primary plus replicas. OceanBase MySQL mode reduces SQL rewrites, but OMS, charset checks, and OBProxy still belong in the cutover plan.
Where they differ
OceanBase is a distributed relational database for multi-tenant clusters (cloud or on-prem). MySQL remains a practical choice for many single-node or simpler HA setups. The decision usually turns on write scale-out, multi-region quorum, and whether you want OLTP and reporting on one system.
Where OceanBase is usually stronger
- Write-heavy OLTP that has outgrown a single primary's CPU or storage.
- Multi-region designs that need Paxos quorum and automatic leader election.
- HTAP workloads that should avoid a separate warehouse for most reporting.
When OceanBase may not be the right choice
- Small, stable workloads with light HA needs.
- Heavy dependence on MySQL-specific extensions you cannot replace.
- Teams that cannot operate a distributed cluster (or buy managed operations).
- Projects that only need a short-lived database and will not amortize migration cost.
Operations and migration
Expect more moving parts than a single-primary MySQL deployment: zones, units, log streams, and OBProxy. Migration is rarely a dump-and-restore. Budget time for schema differences, CDC lag monitoring, and a tested rollback path.
FAQ
01 Can OceanBase replace MySQL without application changes?
It depends on SQL dialect and compatibility mode. MySQL-mode OceanBase covers a large share of MySQL-shaped workloads. Oracle-mode targets a subset of PL/SQL. There is no PostgreSQL mode. Run an OMA (or equivalent) assessment before you commit to a cutover date.
02 How does replication differ?
OceanBase replicates per log stream with Paxos. Leader election and multi-zone quorum are built into that model. Classic single-primary replication does not give you the same automatic leader election or split-brain protection across zones.
03 What about HTAP?
OceanBase can serve transactional and analytical queries on one cluster, with optional columnar storage for analytical paths. Many MySQL deployments still split OLTP and OLAP, or accept replica lag for reporting.
04 What does migration usually involve?
OceanBase Migration Service (OMS) supports incremental CDC from several sources. Plan checksum validation, a dual-write or shadow period if needed, and DNS rollback for the cutover window.