Basic questions on usage of indexes

Hi All,
I have the following questions on the usage of indexes. I would be glad if you could answer the same.
1)     Will using two different indexes for comparison reduce the performance for eg. If in a query I were to compare columns of two different tables, in which on one we have a non unique index while on the other we have a unique index will the query’s performance be poor? If so does it mean to have optimum performance we need to compare columns having same indexes?
2)     Does deleting records from a table remove the indexes present on a given column? If no whether the space occupied by this particular index is overwritten by new indexes or these indexes simply exist without any mapping?
3)     Does the order of conditions in where clause have a significance in terms that we should use the columns having index on them first and so on so that the column not having index comes last in the where clause?
4)     Are indexes optimally used when we compare them in the where condition using LIKE? Or indexes are optimally used only when we compare using =, >, <, <=,>= in the WHERE clause?
5)     If I have the following four columns C1, C2, C3 and C4 and if I were to create a composite index including all the four in the given order (C1, C2, C3 and C4); while I were to write a query with the columns C2, C3 and C4 (excluding C1); will it be a correct usage of the composite index? If no why?
6)     If I have three columns C1, C2 and C3 and if I were to put a composite index on all the three but while writing a query use C1 and C2 only or C1 and C3 only will the index be used optimally? If no then does it make sense to create two composite indexes C1 and C2 & C2 and C3 to have the optimum usage of indexes?
Thanks in advance.

Most of your queries are answered on (directly or indirectly)
http://richardfoote.wordpress.com/
For those questions which remain unanswered, I am afraid you need to check it out yourself as you have the access to your environment. We, over here, can only give you the hints.

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Regards
Edited by: Sarma12 on Apr 17, 2012 5:59 AM

Have you tried setting up a test scenario? For example:
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http://www.oracle.com/oramag/profit/07-may/p27anniv_timeline.pdf
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Quick Reference:
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http://toddmcdermid.blogspot.com.au/2009/10/quick-reference-ssis-in-32-and-64-bits.html
Why do I get "product level is insufficient..." error when I run my SSIS package?
http://blogs.msdn.com/b/michen/archive/2006/11/11/ssis-product-level-is-insufficient.aspx
How to run SSIS Packages using 32-bit drivers on 64-bit machine
http://help.pragmaticworks.com/dtsxchange/scr/FAQ%20-%20How%20to%20run%20SSIS%20Packages%20using%2032bit%20drivers%20on%2064bit%20machine.htm
Troubleshooting OLE DB Provider Microsoft.ACE.OLEDB.12.0 is not registered Error when importing data from an Excel 2007 file to SQL Server 2008
http://www.mytechmantra.com/LearnSQLServer/Troubleshoot_OLE_DB_Provider_Error_P1.html
How Can I Get a List of the ODBC Drivers that are Installed on a Computer?
http://blogs.technet.com/b/heyscriptingguy/archive/2005/07/07/how-can-i-get-a-list-of-the-odbc-drivers-that-are-installed-on-a-computer.aspx
Thanks Shiven:) If Answer is Helpful, Please Vote

Hi S Kumar Dubey,
In SSIS, the Excel Source and Excel Destination natively use the Microsoft Jet 4.0 OLE DB Provider which is installed by SQL Server. The Microsoft Jet 4.0 OLE DB Provider deals with .xls files created by Excel 97-2003. To deal with .xlsx files created by
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By default, there are multiple 32-bit ODBC drivers and fewer 64-bit ODBC drivers installed on a 64-bit platform. To get more ODBC drivers, we can install the 2007 Office System Driver: Data Connectivity Components or Microsoft Access Database Engine 2010 Redistributable.
Besides, please note that 2007 Office System Driver: Data Connectivity Components only install 32-bit ODBC and OLEDB drivers because it only has 32-bit version, but the Microsoft Access Database Engine 2010 Redistributable has both 32- bit version and 64-bit
version.
If you have any questions, please feel free to ask.
Regards,
Mike Yin
TechNet Community Support

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