barcode generator vb.net free Interaction with the SQL Server Environment in Software

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Interaction with the SQL Server Environment
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NOTE: Since the Registry contains system configuration information, Microsoft recommends caution when managing its contents.
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THE REGISTRY AND SQL SERVER
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Although the majority of server and database settings are stored in databases, SQL Server has some information stored in the Registry as well. However, most of this information consists of configuration settings for client tools and user information. These user-specific settings reside in HKEY_CURRENT_USER, and settings that are common for all users reside in the HKEY_LOCAL_ MACHINE subtree. Figure 11-3 shows the MSSQLServer branch of the HKEY_LOCAL_MACHINE subtree.
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Figure 11-3.
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The MSSQLServer branch in the Registry tree
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SQL Server 2000 Stored Procedure Programming
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Since version 6.5, SQL Server has included extended stored procedures for manipulating the Registry. Unfortunately, these stored procedures are never described in Microsoft s documentation. There could be several reasons for this omission:
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Manipulation of the Registry requires skill and great care. The system can crash if critical parts of the Registry are deleted or changed. Although the Registry can be defined theoretically as a hierarchical database, it is not really a database in the sense that we are using the term. It can sustain neither the quantity of information nor the frequency of transactions that are normal for a database system such as Microsoft SQL Server. Reading data from the Registry is much more expensive (in terms of resource use) than reading from a relational database. Microsoft reserves the right to change the interface for these extended stored procedures. Server and database settings are (mostly) stored in the master database and system tables of user databases.
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SQL Server exposes the following extended stored procedures for manipulating the Registry:
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Extended Stored Procedure Purpose
xp_regread xp_regwrite xp_regdeletekey xp_regdeletevalue xp_regenumvalues xp_regaddmultistring xp_regremovemultistring
Reads a Registry value Writes to the Registry Deletes a key Deletes a key s value Lists names of value entries Adds a multi string (zero-delimited string) Removes a multi string (zero-delimited string)
11:
Interaction with the SQL Server Environment
xp_regread
This stored procedure enables you to read the value of the Registry key located on the specified path of the specified subtree:
xp_regread subtree,
path, key,
@value OUTPUT
In the following example, this extended stored procedure reads the root directory of the SQL Server installation:
declare @chvSQLPath varchar(255) exec master..xp_regread 'HKEY_LOCAL_MACHINE' ,'SOFTWARE\Microsoft\MSSQLServer\Setup' ,'SQLPath',@chvSQLPath select go @chvSQLPath SQLPath OUTPUT
xp_regwrite
This stored procedure enables you to write a new value to the Registry key located on the specified path of the specified subtree:
xp_regwrite subtree,
path, key, datatype, newvalue
In the following example, this extended stored procedure adds one value to the Setup key:
exec master..xp_regwrite 'HKEY_LOCAL_MACHINE' ,'SOFTWARE\Microsoft\MSSQLServer\Setup'
SQL Server 2000 Stored Procedure Programming
,'Test' ,'REG_SZ' ,'Test' go
xp_regdeletevalue
This stored procedure enables you to delete the value in the Registry key located on the specified path of the specified subtree:
xp_regdeletevalue subtree,
path, key
In the following example, this extended stored procedure deletes the key that we added in the previous section:
exec master..xp_regdeletekey 'HKEY_LOCAL_MACHINE' ,'SOFTWARE\Microsoft\MSSQLServer\Setup' ,'Test' go
TIP: I have to admit that I do not use these extended stored procedures, which is probably the reason I do not have better examples of writing to and deleting from the Registry. You should be very careful when writing and deleting Registry keys using Transact-SQL. It is often a better idea (performance-wise) to store most of your configuration parameters in a special table in the application database.
JOBS
One valuable administrative feature of Microsoft SQL Server is the capability to launch the execution of custom jobs at specified times. Each job has properties such as name, description, schedule, and a list of operators to be notified in case of failure, as well as a list of steps that need to be performed as part of the job. These steps can
11:
Interaction with the SQL Server Environment
be defined as Transact-SQL code, Active Script code, or operating system commands.
Administration of Jobs
We will take a look at the basics of job creation from Enterprise Manager to show the potential of this feature, but we will not go into too much detail. The following exercise creates a job that performs a backup of the transaction log if it is more then 95 percent full. It is based on the prBackupIfLogAlmostFull stored procedure. You can create a job using a wizard or directly from the Enterprise Manager tree: 1. Open Enterprise Manager and expand the local server in the tree pane. 2. Expand Management, then SQL Server Agent. Make sure that it is running. 3. Click Jobs; SQL Server displays a list of existing jobs. 4. Right-click Jobs and choose New Job. Enterprise Manager displays a New Job Properties form. 5. Fill in the General tab with the information shown in the following illustration:
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