(Assuming you are using icons without labels. Also, avoiding answering with icon suggestions based on comments under question.)
Proximity - The Disable and Delete actions are similar because they affect the availability of the rows, so placing the icons next to each other would be beneficial. A user, who is looking for a delete icon, may instead choose to disable once they see the option is available right next to the delete icon.
Descriptive Tooltips - Instead of using "Disable" and "Delete", you can provide more information in the tooltip to offer the user better guidance.
Immediate Action vs. Dialogue - The Disable action is easily reversed, so this action can be performed immediately after a user selects the disable icon. If the user is unhappy with the result, they should be able reverse the action easily with an enable button (ideally the disable button would turn into an enable button). On the other hand, the Delete action is more destructive, and can be prompted with a dialogue box that would ensure the user wanted to perform this action. The result of clicking each icon informs the user of what actions occurred and are easily reversible.