A method, system and article of manufacture for accessing data in a database independent of the particular manner in which the data is physically represented and for preventing alterations of data in the database when a query is executed against the database are provided. One embodiment provides a method of preventing alterations of data in a database when a query is executed against the database. The method includes providing a logical representation of the data defining a plurality of logical fields abstractly describing associated physical entities of the data; receiving an abstract query comprising at least one logical field of the plurality of logical fields; and locking the at least one logical field before executing the abstract query.