thanks. If use drop option to drop mydb, the how can I load it? create a new and then load? how about the configuration?
I also try it like:
update sysdatabases set status = -32768 where name = 'mydb'
dbcc dbrepair(orderentry, ltmignore)
then got info:
An attempt was made to read logical page '10281806' for object '8' in database
'5' from disk. Wrong logical page '553806' was brought into cache 'default data
cache'.
I have change default data cache size before restore master, but can't remember the original size.