BDB
BDB was a storage engine included in old versions of MySQL.
This storage engine was removed from the 5.1 tree at some point, before the birth of MariaDB.
BDB permitted the use of a patched version of the Berkeley DB key-value store. It was a transactional storage engine. Locking was performed at page level.
Limitations
- Indexes per table: 31
- Columns per index: 16
- Index size: 1024 bytes
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