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NEW QUESTION: 1
Which of the following ACID property in DBMS means that once a transaction has been committed, it will remain so, even in the event of power loss, crashes, or errors?
A. Isolation
B. Atomicity
C. Consistency
D. Durability
Answer: D
Explanation:
Explanation/Reference:
Durability - Durability means that once a transaction has been committed, it will remain so, even in the event of power loss, crashes, or errors.
For CISA exam you should know below information about ACID properties in DBMS:
Atomicity - Atomicity requires that each transaction is "all or nothing": if one part of the transaction fails, the entire transaction fails, and the database state is left unchanged. An atomic system must guarantee atomicity in each and every situation, including power failures, errors, and crashes. To the outside world, a committed transaction appears (by its effects on the database) to be indivisible ("atomic"), and an aborted transaction does not happen.
Consistency - The consistency property ensures that any transaction will bring the database from one valid state to another. Any data written to the database must be valid according to all defined rules, including but not limited to constraints, cascades, triggers, and any combination thereof. This does not guarantee correctness of the transaction in all ways the application programmer might have wanted (that is the responsibility of application-level code) but merely that any programming errors do not violate any defined rules.
Isolation - The isolation property ensures that the concurrent execution of transactions results in a system state that would be obtained if transactions were executed serially, i.e. one after the other. Providing isolation is the main goal of concurrency control. Depending on concurrency control method, the effects of an incomplete transaction might not even be visible to another transaction. [citation needed] Durability - Durability means that once a transaction has been committed, it will remain so, even in the event of power loss, crashes, or errors. In a relational database, for instance, once a group of SQL statements execute, the results need to be stored permanently (even if the database crashes immediately thereafter). To defend against power loss, transactions (or their effects) must be recorded in a non-volatile memory.
The following were incorrect answers:
Consistency - The consistency property ensures that any transaction will bring the database from one valid state to another. Any data written to the database must be valid according to all defined rules, including but not limited to constraints, cascades, triggers, and any combination thereof. This does not guarantee correctness of the transaction in all ways the application programmer might have wanted (that is the responsibility of application-level code) but merely that any programming errors do not violate any defined rules.
Isolation - The isolation property ensures that the concurrent execution of transactions results in a system state that would be obtained if transactions were executed serially, i.e. one after the other.
Atomicity requires that each transaction is "all or nothing": if one part of the transaction fails, the entire transaction fails, and the database state is left unchanged.
The following reference(s) were/was used to create this question:
CISA review manual 2014 Page number 218
NEW QUESTION: 2
A wireless device uses Frequency Hopping Spread Spectrum (FHSS). Which of the following devices can it communicate with?
A. Only another device using FHSS
B. Both a device using FHSS and a device using DSSS)
C. Any other wireless device
D. Only a device using Direct Sequence Spread Spectrum (DSSS)
Answer: C
NEW QUESTION: 3
Ein kleines Büro in einer abgelegenen Gegend erwägt einen neuen ISP. Welcher der folgenden Breitbandtypen basiert auf der Entfernung zur nächsten Zentrale?
A. Faser
B. Kabel
C. DSL
D. Satellit
Answer: D