By having concurrency control you avoid dirty writes (or inconsistent data). It is like your traffic signal - allows one set of users (drivers) to pass through at a time. In computer terms, if a user wants to update some data then the following steps are taken: (a) the data is fetched along with the timestamp (the date, time when it was last modified) (b) the data is modified by the user who then submits the data for update / storage in the system (c) the system verifies the original timestamp with the current timestamp. (i) If both are same, the new data (including the new timestamp) is updated/stored in the system. (ii) If they are different, then obviously the data had changed between the time it was fetched and now - meaning that someone else had updated in the meanwhile. The system typically informs the user that the data had been modified by a different user and asks him/her to submit the modifications once again. The system would implicitly do step (a) above allowing the user to start from step (b) onwards.
concurrency control algorithm
I think the following could be the disadvantages of concurrency control: 1: resource consumption
Less time to access to your data
several problems can occur when concurrent transaction execute in an uncontrolled manner.
avoid the main problems with transaction the lost update problem and the inconsistent retrievals
The point of concurrency is the point intersection.
The Perpendicular bisector concurrency conjecture is the circumcenter
do you thing that pram allows exploitation of concurrency
The point of concurrency of the altitudes in a triangle is the orthocenter, while the point of concurrency for the perpendicular bisectors is the centroid/circumcenter. Sorry if this is late! xD
Depends on the point of concurrency of what. The point of concurrency of altitudes will be outside in any obtuse triangle.
the point of concurrency of the altitudes of a triangle is called the orthocenter.
Yes. Incidentally, every point is a point of concurrency (for some set of lines).
The circumcenter, the incenter is the point of concurrency of the angle bisectors of a triangle.
Yes. Every point in the Cartesian plane is a point of concurrency for some set of lines.
James Jei-Min Lee has written: 'Concurrency control through hierarchical synchronization'
Concurrency is when computer science and the system works together. Recovery is taking the time to heal.
the enviroment the advantage and disavantage of biology control in agriculture
Neither. The statement does not specify the point of concurrency of WHAT!
circumcenter circumcenter is wrong, it is the incenterbecause the point of concurrency is always on the inside of the triangle.
One advantage to having voluntary muscle control is that it is voluntary - we are able to control movement which has many benefits.
The advantage of the token economy is that you learn to control how to spend your money.
An advantage of quality control is that each product or service is consistent and the customer or consumer can count on it as a company. In a company, a lot of money is spent ensuring quality control.