if (db.exists()) {
if (db.isClosed())
db.open("admin", "admin");
db.drop();
db.create();
}
final OClass indexedClass = db.getMetadata().getSchema().createClass("IndexedClass");
indexedClass.createProperty("value", OType.STRING);
indexedClass.createIndex("indexValue", OClass.INDEX_TYPE.UNIQUE, "value");