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The correct answer is B: Refer to a manifest and utilize the --defer and --state flags.

According to dbt’s official documentation, the --defer flag enables developers to defer the resolution of model references (ref(), source()) to an existing manifest—commonly the one generated from a production run. When this flag is used along with --state, dbt reads the prior project state and uses the already-built production models instead of rebuilding upstream dependencies. This is essential because production models are typically large and compute-intensive. By deferring to production artifacts, developers can test only the models they have modified, dramatically reducing warehouse costs and speeding up development cycles.

This approach is foundational to dbt’s recommended development workflow, especially when working with CI/CD or large DAGs. It preserves the integrity of the dependency graph while avoiding unnecessary recomputation.

Option A violates dbt best practices by removing dependency awareness. Option C is unnecessary operational overhead and does not integrate with dbt’s state management. Option D is incomplete because --state alone does not prevent upstream model execution—--defer is required to substitute those models with existing artifacts.

The selector source_status:fresher+ depends entirely on freshness metadata created by a previous dbt source freshness run. Source freshness results are stored in artifacts, and the --state flag points dbt to the location where these artifacts were previously generated. Without first running dbt source freshness, dbt has no stored freshness status and therefore cannot filter sources by “fresher” status. This makes option A required.

Additionally, source freshness checks only work when sources include a freshness block in their YAML configuration. This block specifies the loaded_at_field and the warn_after / error_after thresholds. If no freshness block exists, dbt does not compute freshness at all, meaning such sources cannot appear in the source_status:fresher+ selector. Therefore D is also required.

Options B and E are unrelated to source freshness artifacts and do not contribute to the preconditions for this selector. Option C does not impact freshness logic, as generic tests have no role in generating freshness metadata.

Thus, the two prerequisites are:

Running dbt source freshness (to create freshness metadata).

Defining a freshness configuration on the relevant sources.

In dbt, grants can be configured globally, at the project level, or directly inside a model using the config() function. When a grant is set in dbt_project.yml, it becomes a base definition, and individual models may extend (append to) or override that configuration.

According to dbt documentation, prefixing a grant with a plus sign (+) means “extend the list defined in higher-level configurations.”

Thus, if the project-level config already sets:

select: ['reporter']

…and a model needs to add an additional role (here, bi) without removing the existing one, the correct syntax is:

{{ config(grants = { '+select': ['bi'] }) }}

This tells dbt: “Take the existing grant list (reporter) and append bi to it.”

Option B is incorrect because '+bi' is not a valid grants syntax.

Option C is invalid because grants do not use an inherits parameter.

Option D is invalid because include: is not a grants configuration key.

Therefore, Option A correctly applies dbt’s documented merging behavior for grants.

The correct answer is E: They are written using the {% macro %} wrapper.

Generic tests in dbt are implemented as macros, which means they must be defined using the {% macro %} Jinja syntax. These macros return a SQL query that evaluates to rows representing test failures. dbt executes these queries and marks the test as failed if any rows are returned. This requirement is explicitly documented: all generic tests are macros located in a test directory or within a package.

Option A is partially correct but not universal. Generic tests typically accept arguments such as model or column_name, but dbt does not require both or either. Custom tests can accept any parameters defined by the user. Option B is incorrect because tests do not require ref(); dbt injects the model relation for you when the test is executed. Option C is false because generic tests must be declared in YAML under a model or source for dbt to run them. Option D is incorrect because tests do not always need a column_name (e.g., relationship tests, row-count tests, table-level validations).

Therefore, the defining and universally required characteristic is that generic tests are written as macros, making E the correct answer.

The dbt compilation error explicitly states that the model fct_tasks depends on a node named stg_tasks, but dbt cannot find any resource with that name in the project. dbt resolves ref('stg_tasks') at compile time by searching for a model, seed, or source named stg_tasks. When no such model exists, dbt raises the exact error shown: “depends on a node named 'stg_tasks' which was not found.”

This error occurs before execution and is unrelated to whether the table exists in the warehouse. For dbt, the existence of a warehouse table is irrelevant during compilation—only the presence of a declared dbt resource matters. Therefore, option C (no table in the warehouse) cannot cause this error.

Option A is incorrect because ephemeral models still count as dbt models, and dbt can resolve ref() to them without problem.

Option D is wrong because defining a model in schema.yml is optional and unrelated to dbt’s ability to find the model. Tests and documentation require YAML entries, but model definitions do not.

Thus, the only correct explanation is that no model file named stg_tasks.sql exists under /models, making Option B the correct choice.

The correct answer is C: Model groups can limit references by other models which aren’t in the same group.

According to the dbt documentation, dbt provides a formal access-control mechanism for models through model groups and the access property. Models can be assigned to groups, and each model can be marked as public, protected, or private. The purpose of this system is to create clear boundaries within a project, making it possible to control which models are allowed to reference others. Specifically, dbt enforces rules where models in a group can restrict references from models outside that group, which helps maintain modularity and prevents accidental coupling of unrelated data layers. This is extremely valuable in large analytics engineering projects where teams manage different domains or data products.

Option A is incorrect because dbt does not use Git user groups or any form of identity-based access control for model usage. Option B is incorrect because dbt does not integrate with warehouse roles for controlling model references—access is handled strictly within the dbt project’s metadata. Option D is incorrect because user emails or platform identities have no role in determining which models can reference others. dbt enforces usage rules only through its metadata-driven grouping and access configuration system.

This error occurs because the YAML structure is incorrectly indented, causing dbt’s parser (and YAML itself) to misinterpret the test definitions. In dbt, generic tests must be declared as a list under the tests: key, but YAML is extremely sensitive to indentation levels. In the faulty YAML, unique and not_null are indented incorrectly relative to the tests: key, which produces the error: “mapping values are not allowed in this context.”

According to the dbt Testing documentation, valid generic test syntax follows this exact pattern:

columns:

- name: id

tests:

- unique

- not_null

The indentation under tests: must be consistent and aligned so that YAML interprets the items as list elements, not as malformed mappings. When indentation is wrong, YAML attempts to parse list entries as key-value mappings, which leads to the error seen during compilation.

dbt does not require generic test names to be quoted, nor does it expect tests to be a dictionary. The test list format is correct—only the indentation is wrong. Therefore, the root cause is incorrect YAML indentation, making Option D correct.

This test is a singular test, meaning it is defined as a standalone SQL file placed inside the /tests directory (not attached through YAML like generic tests). dbt executes singular tests by running the SQL query, and the test fails if the query returns any rows. In this case, the test selects all records from fct_orders where status_code = 13. That means if even one row in fct_orders has a status code of 13, the test will fail, because dbt interprets returned rows as evidence of a data-quality issue.

The configuration block at the top sets severity='error', meaning the test raises an error when it fails, rather than a warning. This setting overrides default severity behavior, so option B is incorrect. Singular tests do not need to be attached in YAML because they run automatically when placed under /tests → making option A incorrect. Meanwhile, generic tests live in /tests/generic, but singular tests should live directly under /tests (option C incorrect).

Therefore, the only correct statement is that records with status_code = 13 will cause the test to fail, because the test query is explicitly written to identify such rows.

In dbt, when you configure a generic test like not_null in YAML, the configuration for that test must be a mapping, not another list item. The correct structure is:

tests:

- not_null:

config:

where: "state = 'completed'"

In your original YAML, you wrote:

tests:

- not_null:

- config:

where: "state = 'completed'"

The extra dash (- config) makes config an element of a list rather than a key under the not_null test. This breaks the expected shape of the test definition. When dbt parses the schema.yml, it fails to correctly interpret the patch for the stg_tasks model, which leads to the warning: “Did not find matching node for patch with name 'stg_tasks'…”.

By removing the extra dash and nesting config directly under not_null, dbt now reads this as a single generic test named not_null with a config block that passes the where argument. This allows dbt to correctly attach the test to the completed_at column of the stg_tasks model and eliminates the compiler warning.

Therefore, Option B is the only structurally valid configuration and is the correct answer.

The correct answers are A: schema and C: tags.

In dbt, the dbt_project.yml file is the central configuration file that defines model-level settings. Under the models: section, you can specify a wide range of model configurations such as schema, materialized, tags, alias, and custom meta fields. The schema configuration allows you to control which database schema a model should be built in, giving analytics engineers the flexibility to organize models by domain or environment. The tags configuration is also valid under models: and is widely used to group models logically for selection, documentation, or orchestration workflows.

Option B (source) is incorrect because sources are defined under YAML files in the sources: section, not under models: in dbt_project.yml. Option D (test) is incorrect because tests must be defined in model or source YAML files, not inside the project configuration. Option E (target) is not a configuration that applies to models; rather, it refers to dbt runtime environments and cannot be configured under the models: block.

dbt's project configuration system ensures that model-level behavior is managed centrally and consistently, and schema and tags are two of the officially supported configuration keys under models:.