Answer / ashokram s

Using view you can restrict the data and thus granting privilege on the view instead of base table can ensure security that all data cant be accessible by a particular user

Answer / madhusudhan.madireddy

limit access and view to required fields only

Answer / santosh kumar

Hi,

Advantages of views:

1. View the data without storing the data into the object.

2. Restict the view of a table i.e. can hide some of columns in the tables.

3. Join two or more tables and show it as one object to user.

4. Restict the access of a table so that nobody can insert the rows into the table.

Disadvatages:

1. Can not use DML operations on this.

2. When table is dropped view becomes inactive.. it depends on the table objects.

3. It is an object, so it occupies space.

Why we use pl sql?

0 Answers  

---

what is indexing, searching and user interface?

1 Answers   HCL,

---

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  

---

what is the difference between cursor FETCH and FOR LOOP ?

3 Answers   CG-VAK, Tech Mahindra,

---

Can we write create command in the plsql block?if possible how?

2 Answers  

---

---

What is difference between table and view?

0 Answers  

---

What is before trigger?

0 Answers  

---

Can we use joins in subquery?

0 Answers  

---

Mention what does plv msg allows you to do?

0 Answers  

---

What are code pages ?

1 Answers   BirlaSoft,

---

What is sql query limit?

0 Answers  

---

What is the best sql course?

0 Answers  

---