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Multiple-mode locks: It offers two locks: exclusive locks and shared locks. But why do we require these two locks? There are a lot of transactions in the database system that never updates the data values. These transactions can coexist with some other transactions that update the database. In such a condition multiple reads are permitted on a data item, so multiple transactions can lock a data item in the read or shared lock. On the other hand, if a transaction is an updating transaction, i.e., it updates the data items, it has to make sure that no other transaction can access (read or write) those data items that it needs to update. In this situation, the transaction places an exclusive lock on the data items. Therefore, a somewhat higher level of concurrency can be achieved in comparison to the binary locking scheme
Question: Using the data model express the following queries in SQL. (a) Create the Table named "Cinema" and make the cinema_code to be the primary key of the relation and
The C_Artist application will be developed using the C language (C99 standards) and will be able to compile without warnings and link and run in the Swinburne computer laboratorie
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Code an Oracle Database trigger to enforce the constraint that an employee can never change his or her department.
Data slice explanation
How to create a biological database based on viruses. How to decide which attribute should be there in the table and schema? How to identify the primary keys, foreign keys, domain,
what is 3nf
WRITE SHORT NOTES ON INDEX STRUCTURE OF FILES? There are two basic parts of indices 1. Ordered indices 2. Hash indices Every technique must be evaluated on the bas
discuss the array implementation of a stack.
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
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