Sizing the SQL Server Hardware Table Design Index Design Query Design

Available memory on the server Number of CPUs Desired processor utilization % Clustering Average growth % per year

Data Storage Capacity (Now and Future) Speed of Hard Drives Number of Physical Hard Drives RAID array

Normalization is the concept of abstracting data out of a table and having a pointer to that shared value

Assume everyone has collateral of a car and a house for their loan. Instead of each record carrying car and house, there is a pointer to those names. If “car” changes to “automobile”, it is a simple matter of changing one column in one row, rather than one column in thousands of rows

Bad Solutions◦ Large rows with many columns

Good Solutions◦ Greater number of tables with fewer columns

•Wide tables•Predetermined maximums

•Physically Separated Tables•Logically Combined Data

SELECT b.CustomerID, n.LoanNumber, n.TotalCommitment, c.collat_id

FROM customer b, loan n, collateral cWHERE b.date = '02-28-2007' and b.date = n.dateand b.date = c.dateand b.customerid = n.customeridand b.customerid = c.customeridand n.loannumber = c.loannumberorder by b.customerid, n.loannumber,

n.totalcommitment

Speeds access when joining tables Speeds sort operations Slows INSERTs and DELETEs Indexes are easily added and removed

without impacting the data itself

How frequently will the fields be referenced:◦ WHERE clause◦ ORDER BY clause

Are these tables used more frequently for READs than INSERTs?

Try to join tables on indexed fields Try to join as few tables as possible Try to join on numeric values (Instead of

text) The more specific a WHERE clause, the

quicker your search will be. Never SELECT * from a table, always specify

the desired columns

http://www.sql-server-performance.com http://www.webopedia.com/term/r/raid.html

- Information on RAID hard drives http://technet.microsoft.com/en-us/

magazine/cc165445.aspx - Information on query optimization http://www.edbarlow.com/document/

optimize.html - Information on normalization

What are two benefits of indexes? T/F: Adding indexes changes the data.