Mikhail Gorbachev's policies of glasnost and perestroika had profound and unintended effects on the Soviet Union. In fact, many historians suggest these reforms led directly to the fall of communism and the breakup of the Soviet Union.
In SQL Server, you create a surrogate key by assigning an identity property to a column that has a number data type. A natural key is a naturally occurring descriptor of the data and one of a table's attributes that has no duplicate values. When you use a natural key as a table's primary key, each of the table's rows is uniquely identified.
If X is passed, the DEQUEUE function waits until the entry has been removed from the lock table. Otherwise it is deleted asynchronously, that is, if the lock table of the system is read directly after the lock is removed, the entry in the lock table may still exist. Exceptions of the ENQUEUE Function Module.4 modifying a record, user locks, so that no other person can be accessed it at taht time. then modifies the data, then again he releases the lock. to achive this concept in SAP, first youn eed to create a lock object, in se11, select Lock Object, and the naming convention for this is, it should start with EZ or EY.