so many indexes indexes

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so many indexes indexes

Zeal-DBA

SSCarpal Tunnel

Points: 4332
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April 15, 2013 at 7:11 pm

#292108

what if i create so many indexes in a database, on each and every table small or large...? any bad impact possible in performance or maintenance point of view....?

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Gail Shaw SSC Guru Points: 1004504 More actions · Answer 1

Zeal-DBA (4/15/2013)
what if i create so many indexes in a database, on each and every table small or large...?

You slow down data modifications, increase the size of the database, increase the size of the backup, increase the time to maintain those indexes, increase the time to run backups and restores...

Create useful, necessary indexes, not random ones everywhere.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

Andrew G SSChampion Points: 12809 More actions · Answer 2

http://www.sqlskills.com/blogs/kimberly/indexes-just-because-you-can-doesnt-mean-you-should/

Summer90 SSC-Dedicated Points: 32891 More actions · Answer 3

Have someone give you examples of what SQL will run against the dbs... or start a Profiler session and have app folks run what runs against the db. Then analyze the longer running queries for tuning indexes. Don't just randomly create indexes that you aren't sure will do anything.

Zeal-DBA SSCarpal Tunnel Points: 4332 More actions · Answer 4

thanks for your valuable comment on it.

But what if client ask to create at least one index on each table which are not even suggested by missing index DMV.

he needs to show him analysis on the basis i am denying to create unnecessary indexes, any way is there to show him my analysis.

please advice

John Mitchell-245523 SSC Guru Points: 148809 More actions · Answer 5

Client? Why is the client interested in indexes? All he needs is a database that performs according to his expectations (or according to SLAs). How you, as the DBA, deliver that, should be none of his business.

John

Raju Lalvani Say Hey Kid Points: 695 More actions · Answer 6

Each of your tables must be having a primary key, you can show that index as an index on the table.

Gail Shaw SSC Guru Points: 1004504 More actions · Answer 7

Zeal-DBA (4/18/2013)
But what if client ask to create at least one index on each table which are not even suggested by missing index DMV.

Ask why he wants to create them. Ask for the analysis that shows that his indexes are necessary, the details of what queries those indexes are intended to help.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass

george sibbald SSC Guru Points: 104210 More actions · Answer 8

Zeal-DBA (4/18/2013)
thanks for your valuable comment on it.
But what if client ask to create at least one index on each table which are not even suggested by missing index DMV.
he needs to show him analysis on the basis i am denying to create unnecessary indexes, any way is there to show him my analysis.
please advice

what exactly has the client asked. If he is asking for at least a clustered index on all tables that is a slightly different thing........

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