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What are disadvantages of concurrency control?
I think the following could be the disadvantages of concurrency control: 1: resource consumption
Which are the concurrency control protocols ensure both conflict serializability and freedom from deadlock?
TIMESTAMP PROTOCOL. The protocol manages concurrent execution such that the timestamps determine the serializability order. Timestamp protocol ensures freedom from deadlock as no transaction ever waits.
What is vf speed control?
It is used for sensorless motor control. With vf speed control u can control speed of any induction motor.
What is a congestion control mechanism?
Congestion control mechanisms are tools that control how backed up a substance may get. Traffic congestion control mechanisms can be stop lights, for example.
What is a derivative control?
Derivative control applied in control engineering, usually for the operation of control valves and its importance came during valve tuning. Derivative control is popularly known as anticipatory control. ( controller starts its control action, by anticipating the trend of present value (PV) of parameter.) Derivative control anticipates parameter values and and it will take control action to control the parameter with in set point. Eg: In a water heating system, water temperature is controlled by controlling steam valve opening. Let set point for water is 80°C, and derivative control will check the status of water temperature and if it is slowly increasing range ( may be due to some load change), controller will starts to control temperature by slowly closing steam valve. ( and vice versa) Actually this type control action just observe at control parameter values and initiates control action.
What are the various types of locks used for concurrency control?
Concurrency control employs various types of locks to manage access to shared resources, ensuring data integrity. The primary types include shared locks, which allow multiple transactions to read a resource but prevent writing, and exclusive locks, which permit only one transaction to read or write a resource. Additionally, read locks and write locks can be used to differentiate between operations, while optimistic and pessimistic locking strategies determine when locks are applied based on expected contention levels. Each type of lock addresses different concurrency scenarios, balancing performance and data consistency.
What are disadvantages of concurrency control?
I think the following could be the disadvantages of concurrency control: 1: resource consumption
What Database management system is how to control concurrency?
Concurrency control in a Database Management System (DBMS) is managed through techniques that ensure multiple transactions can occur simultaneously without leading to inconsistency. Common methods include locking mechanisms, where resources are locked for exclusive access, and optimistic concurrency control, which allows transactions to proceed and only checks for conflicts before committing. Additionally, isolation levels define how transaction integrity is visible to other transactions, influencing concurrency behavior. These strategies help maintain data integrity while allowing for efficient access in multi-user environments.
What is concurrency control techniques?
several problems can occur when concurrent transaction execute in an uncontrolled manner.
Difference between coordination and control mixed?
differentiate coordination and control
What concurrency control techniques are used in MySQL?
MySQL employs several concurrency control techniques, primarily using multi-version concurrency control (MVCC) to manage concurrent transactions. MVCC allows transactions to read data without locking, thus improving performance and reducing contention. InnoDB, the default storage engine, utilizes row-level locking for write operations, ensuring that multiple transactions can occur simultaneously without interfering with each other. Additionally, MySQL supports various isolation levels, such as READ COMMITTED and SERIALIZABLE, to control the visibility of changes made by concurrent transactions.
The dbms or some other related software components which enforce certain recovery and concurrency control are called are?
that's auto-recovery!
Differentiate between conditional and unconditional transfer control?
لااعلم
Who had pessimistic view of human nature and a dread of democratic excess?
Thomas Hobbes had a pessimistic view of human nature and a dread of democratic excess. He believed that humans are naturally selfish and competitive, and that without a strong central authority to control them, society would fall into chaos and violence.
How are locking techniques used for concurrency control?
Concurrency means use of database by many users at the same time.Concurrency control techniques (Different techniques) are used control multiple transactions interfere each other to produce wrong results. therefore one of the main techniques used to control concurrent execution of transaction is based on the concept of locking of data item. A lock is a variable associated with a data item in the database and describes the status of that item with respect to possible operation that can be applied to that item. Generally there is a one lock for each data item in the database.
What is control lost update problem?
The lost update problem occurs in database systems when multiple transactions read and update the same data concurrently, leading to one transaction's updates being overwritten by another. For example, if two transactions read the same value and then both update it, the first update may be lost when the second transaction commits its changes. This issue can result in inconsistent data and violates the principles of atomicity and isolation in transaction management. To prevent the lost update problem, systems often implement locking mechanisms or use optimistic concurrency control.
What is disadvantages of concurrency control?
Disadvantage of concurrent control: Since concurrent control uses a series of checks throughout the process/project chain, clarity about the standards required at each control point is essential. This requires a thorough and detailed understanding of the specific tasks involved and their relationship to the desired end product/project outcomes.
