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The index search is very rapid because the index is sorted and its rows are very small Moving from the index to the row(s) is also very rapid because the index tells the DBMS where on the disk the row(s) are located As this example shows, the advantage of having an index is that it greatly speeds the execution of SQL statements with search conditions that refer to the indexed column(s) One disadvantage of having an index is that it consumes additional disk space Another disadvantage is that the index must be updated every time a row is added to the table and every time the indexed column is updated in an existing row This imposes additional overhead on INSERT and UPDATE statements for the table In general, it s a good idea to create an index for columns that are used frequently in search conditions.

Indexing is also more appropriate when queries against a table are more frequent than inserts and updates Most DBMS products always establish an index for the primary key of a table, because they anticipate that access to the table will most frequently be via the primary key Most DBMS products also automatically establish an index for any column (or column combination) defined with a uniqueness constraint The DBMS must check the value of such a column in any new row to be inserted, or in any update to an existing row, to make certain that the value does not duplicate a value already contained in the table Without an index on the column(s), the DBMS would have to sequentially search through every row of the table to check the constraint.

With an index, the DBMS can simply use the index to find a row (if it exists) with the value in question, which is a much faster operation than a sequential search In the sample database, these columns are good candidates for additional indexes: I The COMPANY column in the CUSTOMERS table should be indexed if customer data is often retrieved by company name I The NAME column in the SALESREPS table should be indexed if data about salespeople is often retrieved by salesperson name..

User Each database has a set of users assigned to it. Each database user maps to a login, so each user is a pseudo-account that is an alias to an SQL Server login account. User accounts do not necessarily have to have the same user name as their corresponding login accounts. When an administrator grants access to a database for a particular login account, using either a GUI tool such as Enterprise Manager or the sp_adduser stored procedure supplied with the DBMS, the user account corresponding to the login account is created by the DBMS. In Figure 8-1, the Mgr125 login corresponds to User A in the Employees database and to User D in the Products database. These privileges permit the login to connect to the database(s) but do not give the user any privileges against objects in those databases. I discuss how this happens later in this chapter. Privileges Each user account in a database may be granted any number of privileges (also called permissions). System privileges are general privileges applied at the database level. Microsoft SQL Server divides these into server privileges, which include such permissions as starting up, shutting down, and backing up the SQL Server, and statement privileges, which include such permissions as creating a database and creating a table. Object privileges allow speci c actions on a speci c object, such as allowing select and update on Table T1. Figure 8-1 contains arrows that show the granting of object privileges on Table T1 to User A in the Employees database and on Table T4 to User D in the Products database. These privileges work in much the same way across all relational databases, thanks to SQL standards, and are therefore covered in the Database Privileges section a little later in this chapter.