Beyond Basics

Disk structures and how to examine them

extents

dbsname tabname extnum size bitval count

accounts acctname 1 10000 0 5000

Bitval Interpretation:Value Description Value Description Value Description

0 Unused/free 1 Rem. - empty 2 Blob-empty

4 Home < 50% 5 Rem ɭ/3 6 Blob > 1/3

8 Index - full 9 Rem ɮ/3 10 Blob > 2/3

12 Home - full 13 Rem - full 14 Blob - full