Earn $100 Online Daily. Work From Home. Click Here

What is the correct answer?


In a multi-user database, if two users wish to update the same record at the same time, they are prevented from doing so by

A. jamming

B. password

C. documentation

D. record lock

Related Questions

Drop Table cannot be used to drop a table referenced by a ______ constraint. Use of UNIQUE while defining an attribute of a table in SQL means that… What are the desirable properties of a decomposition ______is a preferred method for enforcing data integrity The cost of reading and writing temporary files while evaluating a query… Which of the following statement on the view concept in SQL is invalid? Which two files are used during operation of the DBMS? A DBMS is a ____ user if at most one user can use the system and is mostly… A transaction is in state after the final statement has been executed. The ______ language consists of SQL statements for operating on the data… Which of the following relational algebraic operations is not from set… Which of the following relational algebra operations do not require the… A relation is in attribute of other composite key. if an attribute of… The fact that all employees of a particular organization should not have… The normalization was first proposed by . Which of the syntax is correct for insert statement? i) insert into values… Tree structures are used to store data in In E-R Diagram total participation is represented by DROP is a statement in SQL. Whenever two independent one-to-many relationships are mixed in the same… _____clause is an additional filter that is applied to the result. The set of all values that can be taken by the attribute is called as… Which of the following is not a recovery technique? ______ keyword is used to find the number of values in a column. ______is a special type of integrity constraint that relates two relations… The part of a database management system which ensures that the data remains… It is an abstraction through which relationships are treated as higher… A _____ is a logical unit of database processing that includes one or… In 2NF The normal form that is not necessarily dependency preserving is