The below table is a comparision table of the ERP software books listing all the important highlights of the books. The highlights listed gives a snapshot of the features.
See the contents pages of the books for a detailed listing.
A common scenario where pessimistic concurrency control is valid is in reservations.
If it's been 30 minutes since the user has last loaded the page, does that mean that they're busily editing the data, and need it to remain locked, or that they've closed their browser and gone home for the night?
As you can see, with pessimistic concurrency control steps must be taken to ensure that data isn't inadvertently locked and therefore unable to be modified by other users.
In many web applications users can only modify data specific to their account, so there's no concern or need for concurrency control.
But in applications where concurrency conflicts may occur, it's worthwhile to consider adding some form of concurrency control.
These controls allow page developers to declaratively access and modify data without writing any code to perform the data access. ) Because multiple users can visit the same web page concurrently, it is possible for a user visiting a data modification page to inadvertently overwrite the modifications made by another user. If two users visit this page simultaneously from different computers and both edit the same row, whomever saves the first will have her changes overwritten by whomever saves the row last.
This article is one in a series of articles on ASP. This type of behavior is known as "last write wins" and is the default behavior for web applications.Because of these challenges and the diminished user experience that follows, pessimistic concurrency control is rarely used.It's only used in situations where concurrency conflicts cannot, under any circumstance, happen.Microsoft offers a form of optimistic concurrency control from the Sql Data Source control that can be enabled by ticking a checkbox.This article looks at different types of concurrency control and then shows how to implement the built-in optimistic concurrency control offered by the Sql Data Source control. Before we explore concurrency control options and see how to utilize the Sql Data Source control's built-in optimistic concurrency control functionality, let's first take a moment to discuss why concurrency control may be needed.Welcome to the Coding Forums, the place to chat about anything related to programming and coding languages.