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Clinometer A clinometer is a device for measuring the steepness of a sloping surface Mobile robots use clinometers to avoid inclines that might cause them to tip over or that are too steep for them to ascend while carrying a load The floor in a building is almost always horizontal Thus, its incline is zero But sometimes there are inclines such as ramps A good example is the kind of ramp used for wheelchairs, in which a very small elevation change occurs A rolling robot cannot climb stairs, but it can use a wheelchair ramp, provided the ramp is not so steep that it would upset the robot s balance or cause it to lose its payload In a clinometer, a transducer produces an electrical signal whenever the device is tipped from the horizontal The greater the angle of incline, the greater the electrical output, as shown in the graph of Fig 34-10A A clinometer might also show whether an incline goes down or up A downward slope might cause a negative voltage at the transducer output, and an upward slope a positive voltage, as shown in the graph at Fig 34-10B

Editor automatically adds adding folder items to after the end statement, as shown in boldface here:

SELECT object_name(s.object_id) AS 'Tablename', SUM(user_updates) AS 'Total Writes', SUM(user_seeks) AS 'User Seeks', SUM(user_scans) AS 'User Scans',

SUM(user_lookups)AS 'User Lookups', SUM(user_seeks + user_scans + user_lookups)AS 'Total Reads' FROM sys.dm_db_index_usage_stats AS s INNER JOIN sys.indexes AS i ON s.object_id = i.object_id AND i.index_id = s.index_id WHERE objectproperty(s.object_id,'IsUserTable') = 1 AND s.database_id = db_id() GROUP BY object_name(s.object_id) ORDER BY 'Total Writes' DESC

for clinometers At A, the output voltage is a simple function of slope At B, up-slope causes positive output voltage; downslope causes negative output voltage

of the myFolder item to the variable fName The changes appear in boldface here:

As you re probably aware, having proper indexes in place to support your workload is critical with SQL Server 2005/2008 (as with any relational database) Generally speaking, you ll want more indexes with a reporting or DSS workload, and fewer indexes with an OLTP workload Regardless of your workload type, you should be aware of whether your indexes are being used and whether you re missing any indexes that would be useful for SQL Server In the dark ages before SQL Server 2005, it was difficult to discover this critical information, but with DMV queries, you can easily discover what s going on with your indexes You can find indexes that aren t being used and you can find missing indexes As Microsoft s Rico Mariani says, If you aren t measuring, you re not engineering The DMV queries that you see in this section will tell you this information.

on adding folder items to myFolder after receiving added_items tell application "Finder" to set fName to name of myFolder end adding folder items to

If you see an index that has millions of writes, with zero or very few reads, then that means that you re getting little to no benefit from maintaining the index, and you should strongly consider dropping that index As the number of reads goes up, it becomes more of a judgment call That s why being familiar with your workload is important One caveat with the missing index query is that it can return results based on ad hoc queries or maintenance job related work that can make it harder to interpret You always want to look at the last_user_seek and the user_seeks columns to see the last time and how often SQL Server thinks it wants the index that it thinks is missing.

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If you see a row with a high index advantage with a last_user_seek from a few seconds or minutes ago, it s probably from your regular workload, so you probably want to seriously consider adding that index You should also be aware that this query won t recommend adding any clustered indexes One feature I ve discovered over time is that if you add a new index of any sort to a table, or if you delete an index, it will clear out all of the missing index stats for that table This may lead you to believe that there are no more missing indexes on the table, which is probably not true Wait a little while, and then run the missing index query again to confirm whether there are any more missing indexes for the table.

7 Add a try block after the tell statement, as shown in boldface here:

The DMV queries in listings 19 through 21 will show bad indexes and missing indexes, and then let you concentrate on an individual table to determine whether you should make any index changes for that table based on your workload..