DOT NET Interview Questions - DotNetSpider
DOT NET Interview Questions - DotNetSpider
DOT NET Interview Questions - DotNetSpider
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(A)What are fact tables and dimension tables in OLAP ?<br />
Twist :- can you explain the star schema for OLAP ?<br />
The dimensions and measures are physically represented by a star schema.Dimension<br />
tables revolve around fact table. A fact table contains a column for each measure as well<br />
as a column for each dimension. Each dimension column has a foreign-key relationship<br />
to the related dimension table, and the dimension columns taken together are the key to<br />
the fact table.<br />
(A)What is DTS?<br />
DTS is used to pull data from various sources into the star schema.<br />
(A)What is fillfactor ?<br />
Twist :- When does plage split occurs ?<br />
The 'fill factor' option specifies how full SQL Server will make each index page. When<br />
there is no free space to insert new row on the index page, SQL Server will create new<br />
index page and transfer some rows from the previous page to the new one. This operation<br />
is called page splits. You can reduce the number of page splits by setting the appropriate<br />
fill factor option to reserve free space on each index page. The fill factor is a value from<br />
1 through 100 that specifies the percentage of the index page to be left empty. The<br />
default value for fill factor is 0. It is treated similarly to a fill factor value of 100, the<br />
difference in that SQL Server leaves some space within the upper level of the index tree<br />
for FILLFACTOR = 0. The fill factor percentage is used only at the time the index is<br />
created. If the table contains read-only data (or data that very rarely changed), you can<br />
set the 'fill factor' option to 100. When the table's data modified very often, you can<br />
decrease the fill factor to 70% or whatever you think is best.<br />
(A)What is RAID and how does it work ?<br />
Redundant Array of Independent Disks (RAID) is a term used to describe the technique<br />
of improving data availability through the use of arrays of disks and various data-striping<br />
methodologies. Disk arrays are groups of disk drives that work together to achieve higher<br />
data-transfer and I/O rates than those provided by single large drives. An array is a set of<br />
multiple disk drives plus a specialized controller (an array controller) that keeps track of<br />
how data is distributed across the drives. Data for a particular file is written in segments<br />
to the different drives in the array rather than being written to a single drive.<br />
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