Answer / nusret sevinc

A primary index is an index on a set of fields that includes
the unique primary
key for the field and is guaranteed not to contain
duplicates. A secondary index
is an index that is not a primary index and may have
duplicates. Two entries are
said to be duplicates if they have the same value for the
search key field associated
with the index.

Answer / roshan jha

The index in which the sort order of a search key is similar
to the sort order of a relation then the index is called
primary index.Ex.front index of the book.
While in secondary index the order of the search key is in
different order from the order of the key in file.eg.index
in back side of some book.
Two entries are said to be duplicate if have same
value for the search key field associated.primary index
doesnot have duplicates.

Answer / sanjib sarkar

Index is a set of <KEY,ADDRESS> pair. Now in the case of
Primary Index both keys and addresses of the records are
kept in order to search a particular record faster but in
the case of Secondary Index only the addresses of the
records are kept in the index not the key.

Answer / khadija

1.A primary index is an index on a set of fields that includes the unique primary key for the field and is guaranteed not to contain duplicates. A Secondary index is an index that is not a primary index and may have duplicates.
2.Example,
Employee ID can be Example of it. Example,
Employee name can be example of it. Because Employee name can have similar values.
3.The primary index contains the key fields of the table. The primary index is automatically created in the database when the table is activated. If a large table is frequently accessed such that it is not possible to apply primary index sorting, you should create secondary indexes for the table.
4.The index in which the sort order of a search key is similar
to the sort order of a relation then the index is called
primary index. Ex, front index of the book. While in secondary index the order of the search key is in
different order from the order of the key in file. Ex, index
in back side of some book.
5.In the case of
Primary Index both keys and addresses of the records are
kept in order to search a particular record faster. In the case of Secondary Index only the addresses of the
records are kept in the index not the key.
6.There can be only one primary index. There can be many secondary indices.

Answer / dinesh uikey

The primary index is on the field which specifies the
sequential order
of the file. There can be only one primary index while there
can be many
secondary indices.

How to create an external table.

1 Answers  

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0 Answers  

There is a trigger defined for INSERT operations on a table, in an OLTP system. The trigger is written to instantiate a COM object and pass the newly insterted rows to it for some custom processing. What do you think of this implementation? Can this be implemented better?

0 Answers  

On friday, you issued several insert statements using query analyzer. You then verified the data had been correctly entered with a select statement on monday, your users report that the data is not there what happened?

0 Answers  

Explain the cube operator?

0 Answers  

1. Using the XML Document below, with the URI “recipe.xml” define the following queries in XQuery: a.) Give the names of all breakfast in the menu. b.) Select breakfasts that have price lower than $7.00? <?xml version="1.0"?> <breakfast_menu> <food> <name>Belgian Waffles</name> <price>$5.95</price> <description> two of our famous Belgian Waffles with plenty of real maple syrup </description> <calories>650</calories> </food> <food> <name>Strawberry Belgian Waffles</name> <price>$7.95</price> <description> light Belgian waffles covered with strawberries and whipped cream </description> <calories>900</calories> </food> <food> <name>Berry-Berry Belgian Waffles</name> <price>$8.95</price> <description> light Belgian waffles covered with an assortment of fresh berries and whipped cream </description> <calories>900</calories> </food> <food> <name>French Toast</name> <price>$4.50</price> <description> thick slices made from our homemade sourdough bread </description> <calories>600</calories> </food> <food> <name>Homestyle Breakfast</name> <price>$6.95</price> <description> two eggs, bacon or sausage, toast, and our ever-popular hash browns </description> <calories>950</calories> </food> </breakfast_menu>

0 Answers  

Who are naive users?

0 Answers  

What you can do to remove data from the cache and query plans from memory for testing the performance of a query repeatedly?

0 Answers  

Explain about normal forms?

0 Answers  

What is the maximum length of an extended property?

0 Answers  

Write the fastest query to find out how many rows exist in a table?

0 Answers  

How do you implement one-to-one, one-to-many and many-to- many relationships while designing tables?

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