Required access permissions and other restrictions

Only the piadmin user or the piadmins group can create, delete, and edit point classes. You must also have read and write permissions on the Point Database (PIPOINT). The piadmin user always has read/write access to PIPOINT, but if you are using piadmins, you might need to set the permissions explicitly.

The following restrictions apply when editing and deleting point classes (but not when creating them).

• You can edit and delete point classes only in stand-alone mode. During stand-alone mode, existing PI SDK, PI API, and PI Server Application connections close, and attempts to reconnect are refused. Subsystems and locally run utilities such as piconfig and piartool can connect. Default-only attribute edits are supported in normal mode.

• You cannot rename attributes.

• You can add attribute sets to any point class.

• You can delete attribute sets from a point class (only if not used by any point) except:

  • Required attribute sets contained in predefined point classes (see Predefined point classes)

  • In-use point classes

• You can rename any point classes, except predefined point classes.

• You can delete any point classes, except:

  • Predefined attribute sets

  • In-use point classes

These restrictions may limit your ability to undo some actions. Before editing point classes, back up the PI Point Database.