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Interview Questions and Answers for 'Cache' - 12 question(s) found - Order By Newest

Frequently asked question in companies using hibernate.
  Q1. Difference between first level and second level cache in hibernate ?Hibernate
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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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   Like      Discuss      Correct / Improve     hibernate   orm   hibernate cache   architecture   technical lead     EFI  Geometric  QuinStreet  Cognizant (CTS)  ZS Associates  Walt Disney      Intermediate        frequent


 Q2. How to configure second level cache in Hibernate ?Hibernate
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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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   Like      Discuss      Correct / Improve     hibernate   orm   hibernate cache   architecture


 Q3. What are some differences between Spring caching and Hibernate caching?Hibernate
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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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   Like      Discuss      Correct / Improve     spring framework   hibernate   spring cache   hibernate cache


 Q4. What are the the methods to clear cache in Hibernate ?Hibernate
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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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   Like      Discuss      Correct / Improve     hibernate   orm   hibernate cache


 Q5. What are different types of second level cache ?Hibernate
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Ans. 1. EHCache ( Easy Hibernate )
2. OSCache ( Open Symphony )
3. Swarm Cache ( JBoss )
4. Tree Cache ( JBoss )

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   Like      Discuss      Correct / Improve     hibernate   orm   hibernate cache   technical lead


 Q6. Can we disable first level cache ? What should one do if we don't want an object to be cached ?Hibernate
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Ans. No.We can either call evict after the object retrieval or can use separate sessions.

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   Like      Discuss      Correct / Improve     hibernate   orm   hibernate cache   architecture


 Q7. Have you ever faced any problem due to caching?
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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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   Like      Discuss      Correct / Improve     caching   cache   java   web applications   production support   application support


Frequently asked in high end product companies.
 Q8. Write code for LRU CacheCore Java2017-01-10 10:15:17

 This question was recently asked at 'United Health Group (UHG),Google,Zenefits,Amazon,Microsoft,SurveyMonkey,LinkedIn,Sanpdeal,MarkMonitor'.This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve     cache  LRU cache  coding  code     United Health Group (UHG)  Google  Zenefits  Amazon  Microsoft  SurveyMonkey  LinkedIn  Sanpdeal  MarkMonitor      intermediate


 Q9. What is dynacache and role of cachespec.xml in WCS ?IBM WCS2017-02-02 14:45:11

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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   Like      Discuss      Correct / Improve     dynacache  cachespec.xml



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 Q10. Can we see objects cached in Dynacache ?IBM WCS2017-02-02 14:45:27

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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   Like      Discuss      Correct / Improve     Dynacache


 Q11. What is meant by "Locality of Reference" or "Cache Locality" ?Core Java2017-05-29 09:56:51

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


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   Like      Discuss      Correct / Improve     Cache Locality  Locality of Reference


 Q12. 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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