I can not find alfresco-global.properties in shared folder. In fact i try to find this file through out application. i could not find any where and i am sure the schema name is changed. what else i can try?
you are looking for a property called db.name or possibly db.url.
If you are not using alfresco-global.properties then your configuration settings should be in "custom-repository.properties" which will be in shared/alfresco/extension.
If you can't find that grep for db.name and db.url in all files in your shared folder. What do you find?
Failing that have you hacked any of the files below webapps/alfresco/WEB-INF? In particular repository.properties?