The following storage engines are no longer maintained.
| Title | Description |
|---|---|
| EXAMPLE Storage Engine | Legacy storage engine designed to assist developers with writing new storage engines |
| FEDERATED Storage Engine | A legacy storage engine no longer in active development. |
| IBMDB2I Storage Engine | Legacy storage engine designed to allow storage on DB2 tables |
| PBXT | PBXT is a general purpose transactional storage engine. It's however not maintained anymore. |
| BDB | BDB storage engine |
| NDB in MariaDB | MySQL Cluster has been removed from MariaDB |
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https://mariadb.com/kb/en/legacy-storage-engines/