Type Definition and storage in Documentum

When I first met Documentum, I started to work on the project. During project execution, I found that the original type definition mode is also very important.

As mentioned before, dm_document can be said to be the root type of all document types. Basically, the custom type comes from this type. here we need to pay attention to the following: we recommend that you create a basic document type for a project. All other types are extended from this basic type. This facilitates data query and management, because all child data types store a record in the parent data table.

For example, to create a type smepc_doc with smepc_doc as the parent type, and then create a type smepc_tech_doc; then, all data of the smepc_tech_doc type has two views:

There are records in smepc_tech_doc_sp and smepc_doc_sp. In other words, if you want to query data of the smepc_doc type, you can see the corresponding document information of all child types whose parent type is smepc_doc.

Is it very convenient? Once the document type has been created and the corresponding data exists, the corresponding parent type cannot be changed. This is very depressing. This is because you have met such a requirement and are very confused.