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As a developer, often DBAs take responsibility for resolving performance issues at the database level so we don't get that much experience diagnosing, tuning, refactoring queries etc.

I'm looking for a database with a bunch of tables, data, queries, triggers, SPs and so on, in which there are deliberate performance problems, and hopefully a series of exercises in which you attempt to identify and resolve the problems. Ideally this will be on MS SQL server.

Anyone know of this kind of thing?

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Don't think that this is a proper answer to your question, but you can read some good primers on tuning here: sqlserverpedia.com/wiki/SQL_Server_Training (nice videos on SQLServerPedia made by a great author Brent Ozar) and a nice checklist from well known author Brad McGehee here: devarticles.com/c/a/SQL-Server/… . Hope they provide you a starting point :). –  Marian Jan 17 '11 at 17:05
    
A nice book to read about SQL performance tuning is The Art of SQL by Stephane Faroult (with Peter Robson). If a database system is mentioned in the book, it's mostly Oracle. This shouldn't be a problem, but unfortunately there are no exercises... –  j.p. Jan 18 '11 at 15:23
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Hey Marian, that's my idea of late night p0rn - ugly men chatting about SQL Server. Thanks, great links. –  flesh Jan 19 '11 at 23:08
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There is another great guy doing late night p0rn for us: midnightdba.itbookworm.com .. his name says it all. He has quality stuff there too! –  Marian Jan 24 '11 at 21:26
    
@Marian - Now toadworld.com/platforms/sql-server/w/wiki/… –  Martin Smith Jul 30 '13 at 20:34
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Paul Randal provides some sample DBs that are actually corrupt: http://www.sqlskills.com/BLOGS/PAUL/post/Conference-corruption-demo-scripts-and-example-corrupt-databases.aspx

Good exercise to go through working with DBCC commands and such on SQL Server.

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If you're a developer and you have a DBA team I strongly suggest you look into booking some time with them to go over tuning. As a DBA (who does dev and architecture too!) supporting thousands of users I can honestly say that I will always make time to meet with developers that are serious about learning how to improve their SQL skills. An email here or there is ok but it takes a lot of time to properly explain things in an email and it takes time away from my more important duties. Scheduling a meeting to discuss tips or techniques or even go over issues live works out great! I can share tips on tools, scripts, how to spot problems, good designs vs. bad designs, etc.

Specific to your question - I'm not aware of any training database like that but it does sounds like a good opportunity for the community!

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