https://www.percona.com/blog/tokudb_storage_engine_for_mysql/
TokuDB Storage Engine for MySQL - Percona
Mar 25, 2026 - Tokutek officially announced the TokuDB for MySQL v2.0 Storage Engine, v2.0 on April 16th, 2009. TokuDB uses Fractal Tree (TM) technology to boost MySQL...
tokudbstorageenginemysqlpercona
https://jira.mariadb.org/browse/MDEV-6162?attachmentViewMode=list
[MDEV-6162] TokuDB: multiple locks and unlock of not locked TOKUDB_SHARE::num_DBs_lock - Jira