Extents

Hi, Im doing my first extent sizing exercise in an attempt to improve performance. in the sysmaster database I am using the following sql: select dbsname,tabname,count(*) number, sum(size) from sysextents group by dbsname,tabname order by number desc Is the size the size of the extent in k - some of my figures dont seem to add up.... Tony Reynolds, NEC Group, Birmingham , UK 8-))