By Fançois Bancilhon; Peter Buneman (eds.)
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Extra resources for Advances in database programing languages
8/22/00 9:56 AM Page 33 DATABASES Strictly speaking, if a database allows for storing records, fields, and tables, that’s all it really needs to keep track of. Some simple databases go no further than this. However, many database manufacturers add storage for additional things to their database. Microsoft SQL Server in particular stores many things in the database other than data. As you read through this chapter, you’ll encounter these other things (such as views or stored procedures), which are collectively called database objects.
For example, SQL Server comes with security roles for System Administrators and Database Creators. After you choose security roles, if any, the Wizard prompts you to choose databases to which the login should have access. If you don’t choose any databases here, the user can log in, but can’t do anything. 6, confirms the choices that you made on the previous panels. If all is well, you just click Finish to create the login. That’s all there is to it! 6 The final screen of the Create Login Wizard Introducing SQL Server I Making a Change to a Table Another task you may be called on to perform as a DBA is the redesign of a table.
The execution plan for a query is the set of steps that SQL Server will follow to get you the information for which you’ve asked. For example, in the SELECT query in the previous section, SQL Server will first find all the rows desired using the index on the CustomerID field and then sort them in the desired order. For more complex queries, an execution plan might have dozens of steps. If you get really familiar with SQL, you can sometimes use optimizer hints in your queries to change the execution plan and make it faster for your particular data.
Advances in database programing languages by Fançois Bancilhon; Peter Buneman (eds.)