Transaction groups are used to store history, log events, synchronize databases tables with PLC, perform calculations, and many more data-centric tasks. To get started, let's create a basic History Group and start logging some PLC values to your database.
Switch the Designer to the Transaction Group workspace by clicking on "Transaction Groups" in the Project Browser panel.
Make a new Historical Group by clicking on File > New > New Historical Group. Your new group, named "Group" will be selected. The OPC-browser panel is now docked to the lower left side of the screen. Browse your OPC device again and drag some OPC tags into the Basic OPC/Group Items section.
Your group starts out disabled. To enable logging, press the Enabled button above the item tables. You can also change the Table Name field under the Action tab to name your table something interesting.
Right now your group only exists in the Designer - you need to Save the project to start the group. Groups execute on the Ignition Gateway. Save your project now.
Your group is now running, logging data to your database connection. To see the data, you can use the Ignition Designer's built-in database query browser. The easiest way to do this is to click on the Query Browser ( 
) button to the right of your group's Table Name field. The Query Browser is a convenient way to directly query your database connection without leaving the Ignition Designer. Of course - you can also use any query browser tools that came with your database.