Create monitoring tables using the installmontables script located in the $SYBASE/ASE-15_0/scripts directory (%SYBASE%\ASE-15_0\scripts for Windows).
Run the installmontables script using the isql utility. For example:
isql -Usa -Ppassword -Sserver_name -i $SYBASE/ASE-15_0/scripts/installmontables