Tabular database regrouping

There may be provided a method for managing column extents of a tabular database, the method may include (a) generating a multi-snapshot row score to each row of a group of rows of the tabular database multiple rows; wherein the multi-snapshot score is indicative of fullness of the row in the multiple snapshots; wherein the group of rows comprises column extents associated with column extents metadata; and (b) improving a column extent metadata parameter by reordering the rows of the group of rows according to the multi-snapshot row scores to provide a re-ordered group of rows that comprises re-ordered group extents associated with re-ordered column extents associated with re-ordered column extents metadata.