A Deadlock inDBMS can be termed as theundesirable condition which appears when a process waits for a resource indefinitely whereas this resource is detained by another process. In order to understand the deadlock concept better, let us consider a transaction T1 which has a lock on a few rows...
This DBMS Lock depends on the technique of message transitory where the transactions and lock manager interchange messages to control the locking as well as unlocking of the data record items. In this tool, the required data structure used for locking the DBMS transaction process is known to be ...
* We now have exclusive use of the printer, print the check. ... * * Unlock the printer so other people can use it * EXEC SQL EXECUTE BEGIN DBMS_LOCK.RELEASE ( :LOCKHANDLE ); END; END-EXEC. Viewing and Monitoring LocksOracle provides two facilities to display locking information for...
Describe five components of the DBMS environment and discuss how they relate to each other. Assume your computer clock runs at the speed of 2.5 GHz (G=10^9). a. what is the clock cycle time of your computer? Reduce your answer to the final value in microseconds. b. what ...
Why does Deadlock occur in DBMS? A deadlock arises when two transactions wait endlessly for each other to unlock data. A deadlock arises when two transactions, P1 and P2, exist in the following mode: P1 = access data items X and Y ...
* We now have exclusive use of the printer, print the check. ... * * Unlock the printer so other people can use it * EXEC SQL EXECUTE BEGIN DBMS_LOCK.RELEASE ( :LOCKHANDLE ); END; END-EXEC. Viewing and Monitoring LocksOracle provides two facilities to display locking information for...
SQL EXECUTEBEGIN DBMS_LOCK.ALLOCATE_UNIQUE ( :LOCKNAME, :LOCKHANDLE );END; END-EXEC.* Lock the printer in exclusive mode (default mode).EXEC SQL EXECUTEBEGIN DBMS_LOCK.REQUEST ( :LOCKHANDLE );END; END-EXEC.* We now have exclusive use of the printer, print the check...* Unlock the ...