What is the advantage of index in sql?

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What are crud methods?

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What is the difference between the sql*loader and import utilities? : aql loader

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can we delete the trigger in a view? if yes why if not why?

5 Answers   Tech Mahindra,

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What are the events on which a database trigger can be based?

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check whether all the emp numbers are indeed unique.

6 Answers  

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What is interval partition?

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Can a table contain multiple primary key’s?

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please explain database architecture..

1 Answers   Infosys,

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What is record variable?

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How would you go about increasing the buffer cache hit ratio? 0. Explain the difference between a hot backup and a cold backup and the benefits associated with each 1. You have just had to restore from backup and do not have any control files. How would you go about bringing up this database? 2. How do you switch from an init.ora file to a spfile? 3. Explain the difference between a data block, an extent and a segment. 4. Give two examples of how you might determine the structure of the table DEPT. 5. Where would you look for errors from the database engine? 6. Compare and contrast TRUNCATE and DELETE for a table. 7. Give the reasoning behind using an index. 8. Give the two types of tables involved in producing a star schema and the type of data they hold. 9. What type of index should you use on a fact table? 10. Give two examples of referential integrity constraints. 11. A table is classified as a parent table and you want to drop and re-create it. How would you do this without affecting the children tables? 12. Explain the difference between ARCHIVELOG mode and NOARCHIVELOG mode and the benefits and disadvantages to each. 13. What command would you use to create a backup control file? 14. Give the stages of instance startup to a usable state where normal users may access it. 15. What column differentiates the V$ views to the GV$ views and how? 16. How would you go about generating an EXPLAIN plan?

2 Answers  

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how do you restrict number of rows for a particular value in a column.For example:there is a table called fruits,having apples,bananas ,papayas.I dont want to have more than 100 apples in that table ,so how can u restrict number of rows for apple to hundred?

6 Answers  

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