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How to create a queue like structure in SQL Server


How to create a queue like structure in SQL Server

By : user2174009
Date : October 19 2020, 08:10 AM
like below fixes the issue Use a float column for prioritisation and an approach similar to Celko trees:
If you have items with priorities 1, 2, and 3 and the last needs to become second, calculate an average between its new neighbours, 1.5 in this example; If another one needs to become second, its priority would be 1.25. This can go on for quite a while; When displaying queued items by their priority, use row_number() instead of float values in UI; If items become too close together (say, 1e-10 or less), have a stored procedure ready to renumber them as integers.
code :


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Sql Server Service Broker: How to structure Conversations for a simple queue scenario?

Sql Server Service Broker: How to structure Conversations for a simple queue scenario?


By : Khaled El Hadidi
Date : March 29 2020, 07:55 AM
this will help You should start with each work item on its own conversation. The producer (initiator) begins a dialog and send the message describing the work item, then commits. The consumer (target) receives the message (or gets activated), inspects the payload to understand the work item details, executes the work, then ends the dialog and commit. The resulting EndDialog message gets sent back to the initiator service queue, and an activated procedure on the initiator queue responds to it by ending the dialog on the initiator side.
This is the simplest deployment and getting it up and running will ensure you have a sound foundation to build upon. Don't cut corners and end the dialog on the initiator side from when the producer enqueues the work item, this is fire-and-forget and has several draw backs.
Which data structure(s) to back a Final Fantasy ATB-style queue? (a delay queue)

Which data structure(s) to back a Final Fantasy ATB-style queue? (a delay queue)


By : user1836435
Date : March 29 2020, 07:55 AM
I wish this help you You store the entities in a Heap and group them by their time left to wait. The group of entities that are next to move would be at the top of the Heap. You only have to update these entities. When their time remaining to wait drops to 0, you remove them from the heap. Put the next group of entities in line at the top of the Heap while decrementing their time to wait by the amount of time that just passed before the previous move.
For example:
How do I dynamically create a queue with an underlying data structure of list in c++?

How do I dynamically create a queue with an underlying data structure of list in c++?


By : Madeline
Date : March 29 2020, 07:55 AM
this one helps. The new instruction returns a pointer, so you don't finish that line at all. You need the variable type to be a pointer if you insist on using new. And the type on the right of new will be the same type as the pointer type of the variable you're initializing.
code :
queue<int, list<int> >* myQueue = new queue<int, list<int> >;
typedef queue<int, list<int> > int_list_queue;
int_list_queue* myQueue = new int_list_queue;
queue<int, list<int> > myQueue;
// or
int_list_queue myQueue;
Create mergeable priority queue interface structure

Create mergeable priority queue interface structure


By : Jandries
Date : March 29 2020, 07:55 AM
wish helps you I have following interfaces: , I think I have found the solution:
code :
public interface IMergeablePriorityQueue<TQ, T> : IPriorityQueue<T>
    where TQ : IMergeablePriorityQueue<TQ, T>
{
    TQ Union(TQ Queue);
}
public class LeftistHeap<T> : IMergeablePriorityQueue<LeftistHeap<T>, T>
    where T : IComparable<T>
{
    public LeftistHeap<T> Union(LeftistHeap<T> Q)
    {
        return new LeftistHeap<T>(Union(root, Q.root), Size + Q.Size);
    }
    ...
}
Is it better to create a queue in a freeRTOS application using freeRTOS queue API, or by using a custom data structure?

Is it better to create a queue in a freeRTOS application using freeRTOS queue API, or by using a custom data structure?


By : cekvirus
Date : March 29 2020, 07:55 AM
wish of those help It depends. Queues are included in freeRTOS because they are required for task switching and other core OS features to work. If you are getting low on storage space (flash memory), it may make sense to use the "free" (as in, it's going to already be there) implementation in freeRTOS. In addition, freeRTOS's queue implementation is pretty good overall.
If you are in somewhat of a timecrunch and you have plenty of flash, I'd just keep with what works. If you've tested it and it works, keep using it.
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