There are two approaches of breaking a Deadlock:
- Process Termination: To eliminate the deadlock, we can simply kill one or more processes.
- Resource Preemption: To eliminate deadlocks using resource preemption, we preempt some resources from processes and give those resources to other processes.
What breaks the deadlock condition?
A deadlock occurs when all processes lock the resource simultaneously (black lines). The deadlock can be resolved by breaking the symmetry.
What are the methods to overcome the deadlock problem?
How To Avoid Deadlock. Avoid Nested Locks: A deadlock mainly happens when we give locks to multiple threads. Avoid giving a lock to multiple threads if we already have given to one. Avoid Unnecessary Locks: We can have a lock only those members which are required.
How can deadlock be recovered?
Killing the process
Killing all the processes involved in the deadlock. Killing process one by one. After killing each process check for deadlock again keep repeating the process till the system recovers from deadlock. Killing all the processes one by one helps a system to break circular wait condition.
Which of the following options would you use to prevent deadlock?
Although it is not possible to avoid deadlock condition but we can avoid it by using the following ways: Avoid Unnecessary Locks: We should use locks only for those members on which it is required. Unnecessary use of locks leads to a deadlock situation. We recommend you to use a lock-free data structure.
What is deadlock and its types?
Deadlock is a situation where a set of processes are blocked because each process is holding a resource and waiting for another resource acquired by some other process.A similar situation occurs in operating systems when there are two or more processes that hold some resources and wait for resources held by other(s).
What is deadlock and recovery?
Deadlock recovery performs when a deadlock is detected. When deadlock detected, then our system stops working, and after the recovery of the deadlock, our system start working again.The method/way is called as deadlock recovery.
What are the different ways to detect a deadlock in distributed system?
Various deadlock detection algorithms in the distributed system are as follows:
- Path-Pushing Algorithms.
- Edge-chasing Algorithms.
- Diffusing Computations Based Algorithms.
- Global State Detection Based Algorithms.
Which of the following are methods for preventing deadlocks Mcq?
Explanation: Preemption and transaction rollbacks, wait and die scheme, wound wait scheme are all different methods of deadlock prevention.
Which of the following options would you use to prevent deadlock in Java Mcq?
Explanation: To avoid deadlock situation in Java programming do not execute foreign code while holding a lock. 7. What is true about threading?
How can we prevent deadlock in database?
Tips on avoiding deadlocks
- Ensure the database design is properly normalized.
- Develop applications to access server objects in the same order each time.
- Do not allow any user input during transactions.
- Avoid cursors.
- Keep transactions as short as possible.
How can we prevent deadlock situation in Java?
How to avoid deadlock in java
- Avoid deadlock by breaking circular wait condition: In order to do that, you can make arrangement in the code to impose the ordering on acquisition and release of locks.
- Avoid Nested Locks: This is the most common reason for deadlocks, avoid locking another resource if you already hold one.
What are the different types of deadlock types and handling strategies?
Strategies for handling Deadlock
- Deadlock Ignorance. Deadlock Ignorance is the most widely used approach among all the mechanism.
- Deadlock prevention. Deadlock happens only when Mutual Exclusion, hold and wait, No preemption and circular wait holds simultaneously.
- Deadlock avoidance.
- Deadlock detection and recovery.
How many types of deadlock are there?
There are 2 different types of deadlocks. A cycle deadlock is what happens when a process A which is holding a lock on resource X is waiting to obtain an exclusive lock on resource Y, while at the same time process B is holding a lock on resource Y and is waiting to obtain an exclusive lock on resource X.
What are the different types of operating system?
Types of Operating Systems
- Batch Operating System This type of operating system does not interact with the computer directly.
- Time-Sharing Operating Systems
- Distributed Operating System
- Network Operating System
- Real-Time Operating System
What are the strategies followed for deadlock correction and detection?
There are three strategies for handling deadlocks, viz., deadlock prevention, deadlock avoidance, and deadlock detection. Under deadlock detection, deadlocks are allowed to occur. Then the state of the system is examined to detect that a deadlock has occurred and subsequently it is corrected.
What are the different ways mounting of the file system?
There are two types of mounts, a remote mount and a local mount. Remote mounts are done on a remote system on which data is transmitted over a telecommunication line. Remote file systems, such as Network File System (NFS), require that the files be exported before they can be mounted.
Which of the following options can be the state of a thread?
Explanation: A thread can be in one of the following states (as defined in the java. lang. Thread. State enumeration): NEW, RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, and TERMINATED.
What is two phase locking protocol in DBMS?
Two Phase Locking Protocol also known as 2PL protocol is a method of concurrency control in DBMS that ensures serializability by applying a lock to the transaction data which blocks other transactions to access the same data simultaneously.
How can we avoid deadlock in Oracle?
FOR UPDATE or SELECTLOCK IN SHARE MODE ), try using a lower isolation level such as READ COMMITTED . When modifying multiple tables within a transaction, or different sets of rows in the same table, do those operations in a consistent order each time. Then transactions form well-defined queues and do not deadlock.
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