Representative embodiments enable the management of index structures for data tables within a database. The techniques can include (1) receiving a request to perform an operation (e.g., read, write, etc.) on a row identifier (ID) associated with an index structure, (2) identifying a plurality of segments that corresponds to the index structure, where each segment stores a respective bitmap, (3) identifying, based on the row ID, a logical block ID of a logical block that encompasses the row ID, (4) utilizing the logical block ID to identify, among the plurality of segments, a subset of segments encompassed by the logical block, and (5) parsing each segment of the subset of segments to identify a respective bitmap that encompasses the row ID, and (6) in response to identifying the respective bitmap: performing an operation on a bitmap value that corresponds to the row ID.