This figure illustrates how 4 contiguous locks are allocated to cover one datafile with 8 data blocks, while another datafile does not have any locks allocated to it. There are four shading patterns on the 16 blocks in the one datafile. The second datafile's blocks have no shading pattern. The first file shows one shading pattern covering the first, fifth, ninth, and thirteenth data blocks. The second pattern covers the second and sixth blocks, and so on.