MCITP SQL Server 2005 Database Developer All-in-One Exam Guide in .NET

Encoder QR Code in .NET MCITP SQL Server 2005 Database Developer All-in-One Exam Guide

MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
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If you suspect the problem is locks, your best course of action is to prove that s the case, present the database developers with the numbers, and let them fix the problem(s) However, simply proving that the hardware is not the problem doesn t prove that the software is the problem I have witnessed a couple of heated blame-storming sessions between DBAs and database developers where fingers are pointed: The problem is memory It s the application It s the hardware It s the software The hero in this situation is the one who understands both sides of the issue and has enough technical savvy that she can prove exactly what the problem is She doesn t need to know how to fix the problem, only to definitively identify it Understanding the following tools will help you definitively prove whether locks are the problem
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Activity Monitor is built into SQL Server Management Studio and can quickly give you a view of locks in your system Since activity can be very dynamic, the Activity Monitor takes a snapshot of activity when it s accessed You can take your time viewing the data, and if desired, refresh it To access the Activity Monitor, look in the Management container of SSMS After right-clicking Activity Monitor, you can choose among the following:
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View Processes View Locks by Process View Locks by Object
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Some of the Activity Monitor icons may not be intuitive The following is a short explanation of what they mean:
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Running Green arrow The system is currently performing work Runnable White check on green circle The process is connected to the server and has run in the past, but is not currently doing anything Sleeping Red down-arrow on white circle The process has work to perform, but is currently waiting for something (such as user input or a lock to be released) Background Gray curved up- and down-arrows on white circle background process that periodically wakes up to do work This is a
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Suspended Hourglass This is a stopped process that has work to perform Look at the Wait Type field for a clue as to what has caused it to stop Other Blue left-right two-way arrow on white circle This indicates a status that is not one of the other statuses (such as Running, Runnable, Sleeping, and so on)
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14: Locks and Cursors
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Once Activity Monitor is showing, any of the three views can be selected in the Select A Page section Activity Monitor is shown in Figure 14-1
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Figure 14-1 Activity Monitor
So that we can see some meaningful information, let s do an exercise We ll use SSMS to create some locks and then use the Activity Monitor to view and kill a lock Exercise 141: Find and Kill Locks See how to identify and kill a lock in video 14-1 1 Launch SSMS and connect to the default instance 2 Click the New Query button to create a new query window As the very first line, enter the following comment so we know this is Query Window 1:
-- Query Window 1
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3 Enter the following script and execute it to start a transaction Notice that we have begun a transaction, but have not committed it or rolled it back
USE AdventureWorks; GO BEGIN Transaction INSERT INTO PersonContact (FirstName, LastName, PasswordHash, PasswordSalt) VALUES ('Old', 'McDonald', 'P@ssw0rd','P@$$S@lt')
4 Within SSMS, open the Management container Right-click Activity Monitor and select View Processes If you look at the Database column, you should see one process for the AdventureWorks database Write down the Process ID for this process here: ________ Leave the Activity Monitor open
MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
5 Go back to SSMS and create another new query window by clicking the New Query button again As the first line, enter the following comment so we know this is Query Window 2:
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