Persistency

Pier has several options for surviving a crash. The main way to avoid losing data is accomplished by the Persistency. A example of checking the persistence for this wiki is Check Image Save. It can be updated with a component.

An example of using a persistency component in a test image:

1. Create a link:

   Create a */Persistency* in this image

   Having a / creates this under the root page.
2. After saving the page, click on the /Persistency link.
3. Choose to create a PRComponent and click add:
   
4. From the list of components, choose PRPersistencySettings:
   
   Next click save.
5. When logged in an admin user, click on the /Persistency link again to open:
   
   If the user is not an admin, then an informative message appears.
   • Options are:
     • History Persistency - This adds the possibility of viewing the history under changes.
     • Null Persistency - Changes & history are not kept.
     • Image Persistency - save the image based on a time, automatically cleans up backups. When this is used, each edit is stored immediately in the file transactions.txt (similar to how each do-it is stored in the changes file).