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== Transaction support == HSQLDB version 2.0 has three transaction control modes. It supports read committed and serializable [[Isolation (database systems)#Isolation levels|transaction isolation levels]] with table level locks or with [[multiversion concurrency control]] (MVCC), or a combination of locks and MVCC. Version 1.8.1 supports transaction isolation level 0 (read uncommitted) only.<ref>{{cite web | title = HSQLDB Documentation | url = http://hsqldb.org/doc/2.0/guide/sessions-chapt.html#sqlgeneral_trans_cc-sect | publisher=hsqldb.org}}</ref>
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