What is the difference between a primary index and a
secondary index? What is a duplicate data entry in an index?
Can a primary index contain duplicates?
Answer Posted / 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.
Is This Answer Correct ? | 5 Yes | 4 No |
Post New Answer View All Answers
Which data type cannot be used as a parameter in a udf?
What are the three types of database design?
What is dbms explain in brief?
What are the key features of dbms?
Who are naive users?
What is the maximum length of an extended property?
Write the fastest query to find out how many rows exist in a table?
How to use online Backups?
Explain about relational operator join?
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?
What is dbms and its application?
What is the physical representation for a many-to-many relationship?
When installing the datastage7.5x2 edtion iam getting aproblem i.e the cpu count is 2 but the cpu count in installation is one . how can i install in my p.c (system is dual core).
A) Which two are benefits of Teradata's support for ANSI Standard SQL? (Choose two.) 1.data is distributed automatically 2.queries get optimized to better plans 3.submit queries from other database systems 4.can interface with BI tools B) Which statement is true when comparing the advantages of third normal form to star schema? 1.Star schema tends to have fewer entities. 2.Star schema requires additional data storage. 3.Third normal form tends to have fewer entities. 4.Third normal form requires additional data storage. C)Which two sets of functions does the Parsing Engine (PE) perform? (Select two.) 1.sorting, formatting, and aggregating of the final answer set 2.flow control of the data to and from the participating tables 3.SQL statement interpretation, syntax validation, and semantic evaluation 4.dispatching the step execution sequence to the AMP via the BYNET D) Which two can be achieved with Teradata Active System Management (TASM)? (Choose two.) 1.disable hardware 2.react to hardware failure 3.influence response times 4.collect metadata E) Which three mechanisms can be used to ensure security within the Teradata Database? (Choose three.) 1.views 2.spool limits 3.roles 4.access rights 5.profiles
How would you design a database for an online site, which would average a million hits a day?