JCR & Oak - Fundamentals Quiz 1

Question 1

How can Oak enforce unique property values?

Which index configuration behavior enforces uniqueness for a property?

Context: Oak indexing

Setting unique to true on a property index Adding an orderable child node Using a traversal query hint Marking the node type mixin

Question 2

Which mixin enables JCR versioning?

What must be added to a node before creating version history?

Context: JCR versioning

mix:referenceable mix:language mix:versionable mix:lockable

Question 3

Why configure an Oak query memory limit?

What is the primary purpose of a query memory limit?

Context: Oak query engine

To cap in-memory processing used by a query To force asynchronous indexing To limit JCR session count To reduce binary datastore size

Question 4

What is a common result of running a broad query without a suitable Oak index?

When an AEM application runs a repository query that has no effective Oak index, what problem commonly appears?

Context: Oak query performance

Traversal warnings and poor repository performance Automatic cache flushes Servlet resolution failure Clientlib category duplication

Question 5

What does EXPLAIN MEASURE provide?

Why use EXPLAIN MEASURE with an Oak query?

Context: Oak query diagnostics

To modify query results To validate JCR node types To inspect the execution plan and runtime measurements To create a new index definition

Question 6

What is the node counter index used for?

How does Oak use node count estimates?

Context: Oak query planning

To enforce ACL inheritance To store version histories To replicate binaries To estimate query cost during planning

Question 7

What does a JCR lock prevent?

What is the main effect of locking a node?

Context: JCR locking

It prevents conflicting modifications according to lock rules It hides the node from all queries It removes inherited permissions It disables versioning

Question 8

How are asynchronous Oak indexes updated?

When an index uses an async lane, when do content changes become searchable?

Context: Oak indexing

After manual package installation After the asynchronous indexer processes them Only after repository restart Immediately within the saving session

Question 9

What does a node type define in JCR?

In JCR, what is the primary role of a node type such as cq:Page or dam:Asset?

Context: JCR basics

A CDN cache rule A replication queue A workflow payload format The allowed structure, properties, and behavioral contract for a node

Question 10

Interpreting a traversal warning

An Oak query log shows a traversal warning for a frequently used query. What does that usually indicate?

Context: Query tuning

The query is using too many service users The repository is in read-only mode The query lacks an appropriate index and may scan large content trees The session has unsaved changes

Question 11

Why assign tags to an Oak index?

What can index tags enable in a query?

Context: Oak index definitions

Selecting a tagged index through a query option Encrypting the index contents Scheduling index compaction Creating node types

Question 12

Which Oak index supports full-text search?

Which index type is commonly configured for full-text queries?

Context: Oak indexing

Lucene index Node counter index Reference index Property index

Question 13

Discarding unsaved transient changes

What does Session.refresh(false) do in JCR?

Context: Session lifecycle

Saves all pending changes and refreshes indexes Creates a new workspace Discards unsaved transient changes and refreshes the session state Reindexes the subtree under the current node

Question 14

What does the reindex flag request?

What occurs when reindex is set to true on an Oak index definition?

Context: Oak index definitions

Oak disables query planning Oak changes the index to synchronous mode Oak rebuilds the index from repository content Oak deletes indexed content permanently

Question 15

What is the purpose of copy-on-read for Lucene indexes?

Why can copy-on-read improve performance?

Context: Oak Lucene

It copies index files locally before reading them It creates backups after each query It duplicates every repository node It copies author content to publish

Question 16

Which query language is the standard structured JCR query option?

Which language is commonly used for structured queries in Oak?

Context: JCR querying

XPath 1.0 only SPARQL JCR-SQL2 GraphQL

Question 17

What does Oak’s query read limit protect against?

A query exceeds its configured read limit. What happens?

Context: Oak query engine

Its results are silently truncated It is aborted to prevent excessive repository reads It is converted to traversal automatically It runs only on publish

Question 18

Role of a mixin node type

Why would you apply a mixin node type to a JCR node?

Context: Content modeling

To force the node into a workflow To add capabilities or constraints without changing the primary type To disable indexing for that node To replace its primary type completely

Question 19

What does binary garbage collection reclaim?

What data is targeted by binary garbage collection?

Context: Oak maintenance

Unreferenced binary datastore records Expired user sessions Old query plans Unused JCR node types

Question 20

Why use an async Lucene index

What is the key tradeoff when configuring an Oak Lucene index on an async lane?

Context: Index design

Automatic replication to publish Better write throughput with near-real-time rather than immediate query updates Lower write throughput but immediate query visibility No support for full-text search

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JCR & Oak – Fundamentals Quiz 1

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