>>Definitely Doug! I know it can increase the indexing time but indexing a 2 million records table is a process that takes already a long time and because I don't show the progression, the user presses the button a second time anyway!
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>Once the user clicks the button to start indexing, disable the button before the indexing starts.

Not sure it will work each time - I had such a thing with a Save button which did some lengthy processing, and I actually had to place a transparent shape over it, to eat the extra clicks. Disabled button seemed to still accumulate clicks, so I called its click from the shape's click, if it was enabled. It solved the extra clicks problem.