To synchronize databases between disparate data processing environments, a buffer, which is part of a first data processing environment having a first database, is loaded with a database update. Loading the buffer does not commit the database update to the first database in the first data processing environment. A remote function is called in the first data processing environment to apply the database update to a second database in a disparate second data processing environment. In response to the remote function determining that the second database has been successfully updated with the database update, the database update is committed to the first database. In response to the remote function determining that the second database has not been successfully updated with the database update, the database update is rolled back in the buffer such that the first data processing environment is unaware of an attempted update to the first database.