What is the most effective way to compare all the geometries in one layer to all the geometries in another?

Correct Answer: B 🗳️
SDO_RELATE -
Format: SDO_RELATE(geometry1, geometry2, param);

Description -
Uses the spatial index to identify either the spatial objects that have a particular spatial interaction with a given object such as an area of interest, or pairs of spatial objects that have a particular spatial interaction.
This operator performs both primary and secondary filter operations.
References: https://docs.oracle.com/cd/B28359_01/appdev.111/b28400/sdo_operat.htm#SPATL1039

In the following SQL statement:

What syntax should follow if you want to build each partitions index later for better manageability?

Correct Answer: B 🗳️
Create index mdsys.spatial_index local
Creating a Local Partitioned Spatial Index
If you want to create a local partitioned spatial index, Oracle recommends that you use the procedure in this section instead of using the PARALLEL keyword, to avoid having to start over if the creation of any partition's index fails for any reason (for example, because the tablespace is full). Follow these steps:
Create a local spatial index and specify the UNUSABLE keyword. For example:
CREATE INDEX sp_idx ON my_table (location)
INDEXTYPE IS mdsys.spatial_index
PARAMETERS ('tablespace=tb_name work_tablespace=work_tb_name')
LOCAL UNUSABLE;
This statement executes quickly and creates metadata associated with the index.
References:
https://docs.oracle.com/database/121/SPATL/creating-local-partitioned-spatial-index.htm

Which statement is true about the networks managed by the Oracle Spatial Network Data Model?

Correct Answer: C 🗳️
Incorrect Answers:
A: A link represents a relationship between two nodes.
B: Within a directed network, any link can be undirected (that is, able to be traversed either from the start node to the end node or from the end node to the start node) or directed (that is, able to be traversed only from the start node to the end node). Within an undirected network, all links are undirected.
D: An isolated node is a node that is not included in any links.
References:
https://docs.oracle.com/cd/B28359_01/appdev.111/b28399/sdo_net_concepts.htm#CIHFIHFB

Which statement correctly defines the corresponding Open Geospatial Consortium (OGC) Web Services standards?

Correct Answer: C 🗳️
VMS: The OpenGIS Web Map Service Interface Standard (WMS) provides a simple HTTP interface for requesting geo-registered map images from one or more distributed geospatial databases. A WMS request defines the geographic layer(s) and area of interest to be processed. The response to the request is one or more geo-registered map images (returned as JPEG, PNG, etc) that can be displayed in a browser application. The interface also supports the ability to specify whether the returned images should be transparent so that layers from multiple servers can be combined or not.
CSW: Catalogue services support the ability to publish and search collections of descriptive information (metadata) for data, services, and related information objects. Metadata in catalogues represent resource characteristics that can be queried and presented for evaluation and further processing by both humans and software. Catalogue services are required to support the discovery and binding to registered information resources within an information community.
WFS: The Web Feature Service Interface Standard (WFS) provides an interface allowing requests for geographical features across the web using platform- independent calls.
OpenLS: The OpenGIS Open Location Services Interface Standard (OpenLS) specifies interfaces that enable companies in the Location Based Services (LBS) value chain to "hook up" and provide their pieces of applications such as emergency response (E-911, for example), personal navigator, traffic information service, proximity service, location recall, mobile field service, travel directions, restaurant finder, corporate asset locator, concierge, routing, vector map portrayal and interaction, friend finder, and geography voice-graphics. These applications are enabled by interfaces that implement OpenLS services such as a Directory
Service, Gateway Service, Geocoder Service, Presentation (Map Portrayal) Service and others.
References:
http://www.opengeospatial.org/standards/wms