SQL Server 2000 Stored Procedure & XML Programming in Visual Studio .NET

Creating DataMatrix in Visual Studio .NET SQL Server 2000 Stored Procedure & XML Programming

SQL Server 2000 Stored Procedure & XML Programming
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only then should scaling out be attempted. The game plan should be something like this:
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1. Optimize the database and the application. 2. Scale up the server. 3. Scale out the system.
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It is possible to create a distributed system without the use of distributed partitioned views. For example, if you are in a business that has only a few, large customers (with a heavy transactional load), you could create a single database per customer instead of storing all transactions in the same database. Then, you could divide databases between several servers or install each one on a separate dedicated server. An application can be designed to direct each query or transaction to the appropriate server to perform data-dependent routing. A similar design would be applicable for an organization that can easily be partitioned into its suborganizations, based, for example, on geographic locations. The key requirement is that there be no (or very little) need to aggregate data on the complete system that is, to run queries (or transactions) that span multiple servers.
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SQL views can have different roles in your database system. Their basic role is to customize table data, but there are more complex roles. You can use standard SQL views to implement security and to ease export and import of data, or you can use the other types of views to achieve performance improvement.
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Because they can transform and join data from one or more tables, standard SQL views are useful for exporting data out of your database system. Standard SQL views alone are not convenient for importing data, since you can insert data only in one base table at the time. Fortunately, you can add an Instead-of trigger to the view and then you will be able to modify multiple base tables (see Triggers on Views earlier in this chapter).
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Standard SQL views are the preferred means of setting security when users are accessing the database through generic tools for accessing and editing database
C h a p t e r 8 : S p e c i a l Ty p e s o f P r o c e d u r e s
information (such as Access or Excel). Different users could have permissions to use different views with different filters on tables:
CREATE VIEW vInventoryTrigonTower AS SELECT * FROM dbo.vInventory WHERE LocationId = 2
Using this technique, developer can also filter which columns are accessible by certain users. For example, you could allow only users from the accounting or human resources departments to view and edit salary data in a table containing employee information.
Reduce Complexity
Views are a very nice way to simplify queries. As shown in Figure 8-19, I ve created a vSpaceUsed view, which lists all database tables and their sizes. Its results are very similar to the results of sp_spaceused. In the past, I used this procedure to get the size of tables. As you may remember, Microsoft recommends that developers use
Figure 8-19
Using vSpaceUsed
SQL Server 2000 Stored Procedure & XML Programming
system procedures, instead of querying system tables directly, since the structure of tables might change between SQL Server versions. Unfortunately, sp_spaceused returns data about a single object only, and I often need a recordset that contains all tables. So, instead of calling sp_spaceused in a loop to collect data in the temporary table, I created a view that returns all data that I might be interested in:
create view vSpaceUsed as select distinct TOP 100 PERCENT db_name() as TABLE_CATALOG , user_name(obj.uid) as TABLE_SCHEMA , obj.name as TABLE_NAME , case obj.xtype when 'U' then 'BASE TABLE' when 'V' then 'VIEW' end as TABLE_TYPE , obj.ID as TABLE_ID , Coalesce((select sum(reserved) from sysindexes i1 where i1.id = obj.id and i1.indid in (0, 1, 255)) * (select d.low from master.dbo.spt_values d where d.number = 1 and d.type = 'E') , 0) as RESERVED , Coalesce((select Sum (reserved) - sum(used) from sysindexes i2 where i2.indid in (0, 1, 255) and id = obj.id) * (select d.low from master.dbo.spt_values d where d.number = 1 and d.type = 'E') , 0) as UNUSED , case obj.xtype when 'U' then Coalesce((select i3.rows from sysindexes i3 where i3.indid < 2 and i3.id = obj.id), 0) when 'V' then NULL end as [ROWS] , Coalesce ( ( (select sum(dpages) from sysindexes where indid < 2 and id = obj.id ) + (select isnull(sum(used), 0) from sysindexes where indid = 255 and id = obj.id )
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