/** Unlock all read locks. This is done if the transaction isolation mode is READ_COMMITTED. */ public void unlockReadLocks() { if (database.isMultiVersion()) { // MVCC: keep shared locks (insert / update / delete) return; } // locks is modified in the loop for (int i = 0; i < locks.size(); i++) { Table t = locks.get(i); if (!t.isLockedExclusively()) { synchronized (database) { t.unlock(this); locks.remove(i); } i--; } } }