Frequently Asked Question on Primary Indexing
Can we build two primary indexes on a file?
No we can’t build two primary index on a file, there is only one primary index on a file.
What is the difference between clustered and non-clustered primary index?
The records in the data file in clustered index are ordered physically based on primary key while in non-clustered primary index the records in the data file are not ordered physically.
How does primary indexing improve database performance?
Primary indexing improve the performance of the database by decreasing the time required to retrieve record from table.
Primary Indexing in Databases
Indexing is a technique used to reduce access cost or I/O cost, now the question arrives what is access cost? Access cost is defined as the number of secondary memory blocks which is transferred from secondary memory to main memory in order to access required data. In this article, we are going to discuss every point about primary indexing.