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Memory Management Interview Questions & Answers - Learning Mode

Memory Management Interview Questions & Answers - Learning Mode

Memory management is the act of managing computer memory at the system level. The essential requirement of memory management is to provide ways to dynamically allocate portions of memory to programs at their request, and free it for reuse when no longer needed. Memory management is the functionality of an operating system which handles or manages primary memory. Memory management keeps track of each and every memory location either it is allocated to some process or it is free. It checks how much memory is to be allocated to processes.

Try Memory Management Interview Questions & Answers - Exam Mode

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Memory Management Interview Questions & Answers - Learning Mode
Try Memory Management Interview Questions & Answers - Exam Mode
Question: What is the use of RECORD LENGTH option in EXP command ?

Answer: Record length in bytes. Source:
Question: List the sequence of events when a large transaction that exceeds beyond its optimal value when an entry wraps and causes the rollback segment toexpand into another extend.

Answer: Transaction Begins.
An entry is made in the RES header for new transactions entry
Transaction acquires blocks in an extent of RBS
The entry attempts to wrap into second extent. None is available, so that the RBS must extent. The RBS checks to see if it is part of its OPTIMAL size. RBS chooses its oldest inactive segment.
Oldest inactive segment is eliminated. RBS extents
The Data dictionary table for space management are updated.
Transaction Completes. Source:
Question: When will be a segment released ?

Answer: When Segment is dropped.
When Shrink (RBS only)
When truncated (TRUNCATE used with drop storage option) Source:
Question: What is a logical backup?

Answer: Logical backup involves reading a set of database records and writing them into a file. Export utility is used for taking backup and Import utility is used to recover from backup. Source:
Question: What is mean by Program Global Area (PGA)

Answer: It is area in memory that is used by a Single Oracle User Process. Source:
Question: Why would an overlay be used?

Answer: Overlay be used as some programs require more main memory than the computer has. Source:
Question: What is the role of PCTFREE parameter is storage clause

Answer: This is used to reserve certain amount of space in a block for expansion of rows.
Question: How does memory compaction work?

Answer: Moves all processes into a single contiguous area at one end of memory, leaving an unused area at the other end. [Alternatively, one could create an unused area in the middle.] Source:
Question: What are disadvantages of having raw devices

Question: How can reply if interviewer say thats why you choose B.Tech after passing the exam of Bsc.

Answer: No one will go for if once he completed Bsc. Source:
Question: What is a Shared SQL pool?

Answer: The data dictionary cache is stored in an area in SGA called the Shared SQL Pool. This will allow sharing of parsed SQL statements among concurrent users. Source:
Question: What are the four main functions of a memory manager?

Answer: 1.Keep track of which parts of memory are in use. 2.Allocate memory to processes when they require it.
3.Protect memory against unauthorized accesses.

4.Simulate the appearance of a bigger main memory by moving data automatically between main memory and disk. Source:
Question: How will you estimate the space required by a non-clustered tables

Answer: Calculate the total header size
Calculate the available dataspace per data block
Calculate the combined column lengths of the average row
Calculate the total average row size.
Calculate the average number rows that can fit in a block
Calculate the number of blocks and bytes required for the table.

After arriving the calculation, add 10 % additional space to calculate the initial extent size for a working table. Source:
Question: Which parameter in Storage clause will reduce no. of rows per block?

Answer: PCTFREE parameter
Row size also reduces no of rows per block. Source:
Question: What is dictionary cache ?

Answer: Dictionary cache is information about the databse objects stored in a data dictionary table. Source:
Question: What is use of Rollback Segments In Database ?

Answer: They allow the database to maintain read consistency between multiple transactions. Source:
Question: What is a data segment?

Answer: Data segment are the physical areas within a database block in which the data associated with tables and clusters are stored. Source:
Question: What is the use of INDEXES option in EXP command ?

Answer: A flag to indicate whether indexes on tables will be exported. Source:
Question: How will you monitor the space allocation ?

Answer: By querying DBA_SEGMENT table/view. Source:
Question: What is redo log buffer

Answer: Changes made to entries are written to the on-line redo log files. So that they can be used in roll forward operations during database recoveries. Before writing them into the redo log files, they will first brought to redo log buffers in SGA and LGWR will write into files frequently.
LOG_BUFFER parameter will decide the size. Source:

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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
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When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
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