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dbms c++ serializability shared locks exclusive locks intention locks acid rollup order by create table ddl cursors pl/sql records 1nf 2nf 3nf bcnf functional dependencies fd normalization first normal form second normal form dbms vs file based advantages of dbms c++ constants c++ keyword c++ operators c++ variables if else switch case default c++ break do while continue for loops while group by select into projection from where selection cube select third normal form degree of relationship types of relationship transaction atomicity consistency durability isolation precedence graph conflict equivalent time stamp ordering data file heap organization pile file sequential organisation primary index dense index cluster index hashing b+tree multilevel boyce codd partial dependency transitivity dependecny #transaction #schedule recoverability locks acid properties lost update dirty read unrepeatable reads phantoms timestamp granularity er diagram erp entity customer relationship management attributes cardinality