https://userapps.support.sap.com/sap/support/knowledge/en/2712273
2712273 - How to change a db device when set as a wrong segmap and wrong sequence - SAP ASE | SAP...
While creating a new database same as before, given a wrong sequence of device and set a wrong segmap.
https://userapps.support.sap.com/sap/support/knowledge/en/2221283
2221283 - sysusages shows device segments with segmap 0. Why? - SAP ASE | SAP Knowledge Base Article
A database device fragment has the segmap set to 0 in the sysusages system table, and is therefore some database pages are unusable. Can these pages be made...