From the CRS report, Resolutions of Inquiry: An Analysis of Their Use in the House, 1947-2017 (Nov. 9, 2017 R40879):
A resolution of inquiry is a simple resolution making a direct request or demand of the President or the head of an executive department to furnish the House with specific factual information in the Administration’s possession. Under the rules and precedents of the House of Representatives, such resolutions, if properly drafted, are given a privileged parliamentary status. This means that, under certain circumstances, a resolution of inquiry can be brought to the House floor for consideration even if the committee to which it was referred has not reported it and the majority party leadership has not scheduled it for action.
Although Representatives of both political parties have utilized resolutions of inquiry, in recent Congresses, such resolutions have overwhelmingly become a tool of the minority party in the House. This development has led some to question whether resolutions of inquiry are being used primarily for partisan gain or are unduly increasing the workload of certain House committees. Others have attributed the increase to a frustration among minority party Members over their inability to readily obtain information from the executive branch.
Available data suggest that 28% of the time, a resolution of inquiry has resulted in the production of information to the House. In half of the cases examined here, however, it is simply unknown, unclear, or in dispute whether the resolution of inquiry produced any of the requested information, a fact which might suggest the need for additional investigation of the efficacy of this parliamentary oversight tool by policymakers.