Hibernate - Interview Questions and Answers for 'Cache' | Search Interview Question

Hibernate - Interview Questions and Answers for 'Cache' - 14 question(s) found - Order By Newest

Frequently asked question in companies using hibernate.

Q1. Difference between first level and second level cache in hibernate ?

Ans. 1. First level cache is enabled by default whereas Second level cache needs to be enabled explicitly.

2. First level Cache came with Hibernate 1.0 whereas Second level cache came with Hibernate 3.0.

3. First level Cache is Session specific whereas Second level cache is shared by sessions that is why First level cache is considered local and second level cache is considered global.

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Q2. How to configure second level cache in Hibernate ?

Hibernate

Ans. 1. Configure Provider class in Hibernate configuration file.

2. Add Cache usage tag ( read-only or read-write ) in mapping files ( hbm ).

3. Create an XML file called ehcache.xml and place in classpath which contains time settings and update settings, behavior of cache , lifetime and idletime of Pojos, how many objects are allowed.

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Q3. What are some differences between Spring caching and Hibernate caching?

Hibernate

Ans. Spring caching makes use of its intercepting capabilities to add caching to method calls. Therefore, the entire object is cached and reused. Hibernate, on the other hand, has more domain-specific knowledge of the Entity being cached and can handle the objects more appropriately.

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Q4. What is the use case for AWS Gateway cached , stored and VTL ?

Amazon Web Services (AWS)

Ans. AWS Cached - Low Availability than AWS Stored, Lower cost than AWS Stored

AWS Stored - High Availability, High Local Storage Cost

AWS VTL - S3 Used as Back up only.

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Q5. What are the the methods to clear cache in Hibernate ?

Hibernate

Ans. Evict() and clear(). Evist is used to clear a particular object from the cache whereas clear clears the complete local cache.

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Q6. What are different types of second level cache ?

Hibernate

Ans. 1. EHCache ( Easy Hibernate )
2. OSCache ( Open Symphony )
3. Swarm Cache ( JBoss )
4. Tree Cache ( JBoss )

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Q7. Can we disable first level cache ? What should one do if we don't want an object to be cached ?

Hibernate

Ans. No.We can either call evict after the object retrieval or can use separate sessions.

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Q8. Have you ever faced any problem due to caching?

Ans. Yes , sometime we receive issues related to outdated pages being rendered to the user. In those cases we clear the cache and then try to investigate the reason for that. Sometime the issue is due to comparatively high refresh interval. In those cases we reduce the cache refresh interval.

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Frequently asked in high end product companies.

Q9. Write code for LRU Cache

Core Java

Ans. https://www.geeksforgeeks.org/lru-cache-implementation/

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Q10. What is dynacache and role of cachespec.xml in WCS ?

IBM WCS

Ans. Dynacache in WCS is the object cache. Instead of creating objects again and again , the store objects are rendered on the basis of matched rules. Caching rules are stored in a configuration file called cachespec.xml.

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Q11. Can we see objects cached in Dynacache ?

IBM WCS

Ans. We can see , monitor and can even change dynacache manually but for that we need to install a seperate application provided by WCS.

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Q12. What is meant by "Locality of Reference" or "Cache Locality" ?

Core Java

^{This question is still unanswered. Can you please provide an answer.}

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Q13. Which data structure would you use to implement LRU cache and Why ? Can you tell me the time complexity for it ?

Algorithm

Ans. We can use LinkedHashMap as it will give time complexity of O(1) for lookup and We can maintain the insertion order to identify the Last used elements for eviction.

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Q14. Do you know how can we export Redis data ?

Redis

^{This question is still unanswered. Can you please provide an answer.}

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Q15. Which of the following is not true for Hibernate Cache ?

Hibernate

a. First level cache is enabled by default

b. First level Cache is Session specific

c. First level cache is considered global

d. First level Cache came with Hibernate 1.0

Ans.c. First level cache is considered global

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