What is a Persistable entity? - Answer-An Entity that can be saved in the database.
What is a Non-Persistable entity? - Answer-An entity that can only be saved in runtime memory.
What is a Generalized entity? - Answer-An entity that lends its attributes, associations, event handlers, validati...
MENDIX - ADVANCED CERTIFICATE STUDY Q&A
What is a Persistable entity? - Answer-An Entity that can be saved in the database.
What is a Non-Persistable entity? - Answer-An entity that can only be saved in runtime
memory.
What is a Generalized entity? - Answer-An entity that lends its attributes, associations,
event handlers, validation rules and any other properties to another entity.
What is a Specialized entity? - Answer-An entity that inherits all or part of its attributes,
associations, event handlers, validation rules and any other properties from another
entity.
what are the system member properties? - Answer-CreatedDate, ChangedDate, Owner,
ChangedBy
How do you show multiple specialized entities in the same list view? - Answer-By
adding a template for every specialized entity while using the default for the generalized
entity.
What do you need to do after an Object type decision? - Answer-Cast to entity to the
correct specialization.
What should you do if the Object type decision is empty? - Answer-Create a log
message, since this is unexpected behavior.
Why should you use inheritence? - Answer-It allows you to make reusable microflow,
which increases the consistency and maintainability of your app.
when should you use a 1-1 association over inheritance? - Answer-when the entity in
question isn't a true specialization of the generalized entity and/or the generalized
entity's properties are not required when dealing with the entity in question.
Why is creating a new entity and making it a specialization of the FileDocument or
Image entity preferred over using original entities? - Answer-The original entities are
part of the System module, which makes them ineditable.
What indicates ownership over an association. - Answer-A dot on that entity's side of
the association.
Why is the main downside of a *-* association - Answer-It uses a lot more memory that
other associations.
What is an index? - Answer-An extra table for a given entity in the database with ID's
and a specified attribute(s) in a sorted order which allows for faster queries.
, When do you use an index? - Answer-On entities with a lot of objects that are read
more than written and on the most searched attributes, that also have many
possibilities.
What is the downside of an index? - Answer-every time an object is added, the entire
index table needs to be updated, which can potentially cause performance issues.
What are the 4 stages of a domain model restructering? - Answer-1. extend your
domain model
2. model the data conversion
3. deploy the new model and convert the data.
4. clean up the model.
What does the expression [reversed ()] do? - Answer-it tells mendix to reverse the
direction in which a association is read.
What does localization on a datetime attribute do? - Answer-It changes the datetime
value to the time zone of the user when used or viewed. The value is still stored on UTC
time.
When should you turn localization off? - Answer-when time offset is irrelevant
What is the Mendix Client? - Answer-The Client runs in your browser and renders the
front-end of your application. it makes use of HTML, CSS and JavaScript. It talks with
Mendix Runtime and stores local objects within a session.
What is mendix runtime? - Answer-This is the application server that provides the
Runtime environment of your apps and executes any logic defined in the application
model. it talks with both the mendix client and the database server.
What is the Database server? - Answer-Any form of database that is supported by
mendix. stores all data from your app and is structured based on the domain models. it
talks with mendix runtime.
what type of resource are pages, stylesheets and images in mendix? - Answer-Static
resources
Why would you choose database over Xpath as a data source for a list view? - Answer-
Constrains are easier to specify and are less resource intensive, furthermore they can
be used by offline mobile apps.
How do you analyze SQL Queries in Mendix. - Answer-By setting the log level on
ConnectionBus_Retrieve to Trace and checking the console logs.
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