Answer / sa123

For good performance Index is required.
Consider the case of a very large table (20,000,000 rows)
to which new records are added daily (usually about 1,000
of them). Every night, you need to report these additions
on an audit trail. Rather than scan the whole table looking
for changes, you will want to use an index over the
TRANSACTION_DATE column. But the index would need to be
huge. This is a case in which your index is over the entire
table, although you are actually interested only in the
1,000 or so records that were added today. The actual index
is physically many times larger than it needs to be, and it
uses many more disk I/Os to traverse the binary tree to the
leaf data.

Answer / samar singh

Index by tables are composed of two components
1)primary key of binary_interger
2)column of scalar or record type

and used for increasing the size dynamically.

Answer / opulentus

opulentus

what is the differnce between procedure and function? in both dml operations can work and in procedure through out parameter you can return value ,then what is the differce?

3 Answers   3i Infotech,

---

How does one use sql*loader to load images, sound clips and documents? : aql loader

0 Answers  

---

What is a Procedure ?

3 Answers  

---

Is sql database free?

0 Answers  

---

what is isam? : Sql dba

0 Answers  

---

If we have n no of columns in a table, can we add new column in that table with not null constraint?

2 Answers  

---

Why is theta join required?

0 Answers  

---

how many sql ddl commands are supported by 'mysql'? : Sql dba

0 Answers  

---

Is sqlexception checked or unchecked?

0 Answers  

---

Is it possible to update views?

0 Answers  

---

Are pl sql variables case sensitive?

0 Answers  

---

What is mutating error?

0 Answers  

---