Eliminate Risk of Failure with Oracle 1Z0-771 Exam Dumps

Theme Styles define visual themes in APEX:

A . When the Is Public attribute is enabled: Setting 'Is Public' to 'Yes' in Shared Components > Theme Styles allows runtime selection (e.g., via a dropdown in the app UI), letting users switch between styles (e.g., 'Vita' to 'Vita - Dark').

B . Control layout: False; layout is managed by templates and regions; Theme Styles handle colors, fonts, etc.

C . 'Is Current' depends on 'Read Only': False; 'Is Current' marks the default style, independent of 'Read Only' (which locks editing).

Technical Insight: Public styles require multiple defined styles and a UI component (e.g., Dynamic Action) to expose the switcher.

Use Case: Offering light/dark mode options to users.

Pitfall: Without a switcher, 'Is Public' has no visible effect.

Regenerating Push Notification credentials updates the VAPID keys (public/private pair) in the PWA settings:

A . Existing Push Subscriptions invalidated: Subscriptions (in APEX_APPL_PUSH_SUBSCRIPTIONS) are tied to the old keys. New keys break this link, requiring users to re-subscribe (e.g., via browser prompts), as the push service (e.g., Firebase) can't authenticate old subscriptions.

B . New notification server: False; the server configuration remains; only credentials change.

C . Disabled for the app: False; notifications remain enabled but won't work for old subscriptions until re-established.

Technical Insight: Regeneration updates APEX_PWA_VAPID_PUBLIC_KEY and APEX_PWA_VAPID_PRIVATE_KEY, triggering a subscription refresh cycle.

Use Case: Security breach requires key rotation.

Pitfall: Users must re-opt-in, potentially losing some subscribers.

The Universal Theme (Theme 42) provides pre-built components:

A . Calendar: A region type for date-based displays (e.g., events), styled with Universal Theme templates (e.g., FullCalendar integration).

B . Comments: A region type for user feedback or notes, with built-in styling and moderation options.

C . Badge: A UI component for displaying counts or statuses (e.g., '5 New'), often in navigation or lists, styled via CSS classes.

D . REST Data Sources: A data feature, not a theme component; it's a Shared Component, not a UI element tied to Universal Theme.

Technical Insight: These components leverage Universal Theme's CSS (e.g., t-Badge, t-Calendar) and JavaScript for interactivity, reducing custom coding.

Use Case: A dashboard with a Calendar for schedules, Comments for feedback, and Badges for unread alerts.

Pitfall: Customizing requires Theme Roller or CSS overrides.

Logging in APEX tracks runtime activity:

A . apex_automation.log_info: Correctly logs an informational message to the execution log for automation tasks (e.g., workflows). The syntax || :ENAME || concatenates the item value (e.g., 'JOHN') into 'SAL for JOHN increased by 19.' It's stored in APEX_AUTOMATION_LOG, viewable in Monitoring.

B . apex_debug.info: Logs to debug output, but the syntax is flawed (:ENAME || isn't concatenated properly; should be 'SAL for ' || :ENAME || ...). It's valid only when debugging is enabled (e.g., APEX_DEBUG.ENABLE).

C . apex_error.add_error: Adds an error to the error stack for user display, not a log message.

Technical Insight: log_info is non-intrusive, unlike apex_debug, which requires debug mode, or apex_error, which signals failure.

Use Case: Logging salary updates in a scheduled job without debug overhead.

Pitfall: Ensure :ENAME is in scope (e.g., page item).

The APEX_PWA package manages Push Notifications:

B . APEX_PWA.PUSH_QUEUE: This procedure forces immediate processing of the Push Notification queue, sending queued messages (added via APEX_PWA.SEND) to subscribed devices without waiting for the default scheduler (e.g., every 5 minutes). Example: APEX_PWA.PUSH_QUEUE; ensures a 'Meeting now!' alert goes out instantly.

A . APEX_PWA.HAS_PUSH_SUBSCRIPTION: Checks if a user has an active subscription (returns BOOLEAN), not for sending.

C . APEX_PWA.PURGE_QUEUE: Clears the queue, discarding unsent messages, not sending them.

Technical Insight: PUSH_QUEUE triggers a job to contact the push service (e.g., Firebase), using VAPID keys from the PWA configuration.

Use Case: Urgent alerts (e.g., system outage) need immediate delivery, bypassing delays.

Pitfall: Overuse can strain the server; use judiciously for time-sensitive messages.