Installing Adaptive Server version 15.7 and later overwrites the
        current Adaptive Server software. Before installing, verify that your databases are error
        free, and back up the Sybase directory.
            
            
            
            
            
            
        
- To ensure that your database is error free, run dbcc
                        checkdb, dbcc checkcatalog, and
                        dbcc checkstorage before loading any new
                    Adaptive Server binaries, including the master database. If the dbcc commands reveal problems, check the Error Messages and Troubleshooting Guide for actions
                    necessary to fix the problem. If the error is not listed in the manual, call
                    Sybase Technical Support.
- After you have verified that your database is error free, back
                    up your $SYBASE directory in case you need to roll back
                    to the original version of the software.
- Adaptive Server provides the uninstmsgs.ebf
                    script for backing up sysmessages before upgrading to 15.7
                    ESD #2. Use it to back up sysmessages before running
                        instmsgs.ebf.