The 'Transaction commit' activity commits the database changes made in between the start of a transaction and this activity.

Activity properties
begin var Connection := CodolexFramework.DatabaseQueryProvider['Codolex'].Connection; Connection.Commit; end;  | 
Resulting code
Select one of the available databases that can work with transactions in the properties.
When multiple transactions are started on a database, the last transaction will be committed by this activity.