Add a Covered Index to tables to get rid of “bookmark lookups.” The idea of bookmarks: SQL Server uses Bookmarks when you use columns in your query that are not non-clustered/clustered indexes. So if we have something like this:
SELECT AreaID, ContentID, ApprovalCodeID, isSubmissionPoint FROM ContentAreas WHERE AreaID = 31 AND ContentID > 30000 AND ModifierID > 65000
And let’s say that AreaID is a clustered index and ContentID is a non-clustered index. If ModifierID is not an index of any kind, it would function as a “bookmark lookup” in this query. To not use a “bookmark lookup,” use a Covered Index, which clumping the Modifier column with ContentID and turning both into a Covered Index (a kind of composite index).