What is pessimistic concurrency control in SAP BC-ESI-RAP - RESTful ABAP Programming Model?

SAP Term: pessimistic concurrency control

• Component: BC-ESI-RAP

• Component Name: RESTful ABAP Programming Model

• Description: Pessimistic concurrency control prevents simultaneous modification access to data on the database by more than one user. In RAP this is ensured by the RAP locking mechanism.

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• Key Concepts: 
  Pessimistic concurrency control is a type of data access control used in the BC-ESI-RAP RESTful ABAP Programming Model. It is used to ensure that only one user can access and modify a particular piece of data at any given time. This prevents data corruption and ensures that all users are working with the same version of the data. 
  
  How to use it: 
  In order to use pessimistic concurrency control, a user must first acquire a lock on the data they wish to modify. This lock will prevent other users from accessing or modifying the data until the lock is released. Once the user has acquired the lock, they can then modify the data as needed. Once they are finished, they must then release the lock so that other users can access and modify the data. 
  
  Tips & Tricks: 
  When using pessimistic concurrency control, it is important to remember to always release the lock once you are finished with the data. This will ensure that other users can access and modify the data as needed. Additionally, it is important to be aware of how long you have had a lock on a particular piece of data, as this could lead to conflicts with other users who are trying to access or modify the same piece of data. 
  
  Related Information: 
  Pessimistic concurrency control is just one type of data access control used in the BC-ESI-RAP RESTful ABAP Programming Model. Other types of data access control include optimistic concurrency control and snapshot isolation. Additionally, there are various techniques for implementing these types of controls, such as using database transactions or using locks on individual records.