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although this is offered more as a suggestion than an absolute definition. Although the standard uses the word to refer to SQL as a database language, it never actually defines the term. This approach might be fine for the standard, but in the real world, it can be difficult for an RDBMS to create an SQL environment without creating some sort of component that users can point to and say, Yes, there is the database. And indeed, most products allow you to create, alter, and delete objects that are called databases. In SQL Server, for example, an instance of the DBMS software can manage any number of databases, with each database being a logical collection of database objects that the designer chooses to manage together. Sybase, MySQL, and IBM s DB2 have similar architecture. SQL Server provides a management console called Microsoft SQL Server Management Studio to view and manipulate database objects. The Object Explorer panel along the left margin provides a hierarchical directory-like structure that includes a Database node, with each database shown under it, and objects such as tables shown under each database. Figure 2-3 shows SQL Server Management Studio with the INVENTORY database expanded down to the columns of the ARTIST_CDS table.

DML (Data Manipulation Language) statements generally produce fewer performance problems than query statements. However, there can be issues. For INSERT statements, there are two main considerations: Ensuring adequate free space for new rows Tablespaces that are short on space present problems as the DBMS searches for free space to hold rows being inserted. Moreover, inserts do not usually put rows into the table in primary key sequence because there usually isn t free space in exactly the right places. Therefore, reorganizing the table, which is essentially a process of unloading the rows to a at le, re-creating the table, and then reloading the table can improve both insert and query performance. Index maintenance Every time a row is inserted into a table, a corresponding entry must be inserted into every index built on the table (although null values are usually not indexed). The more indexes, the more overhead every insert will require. Index free space can usually be tuned just as table free space can. UPDATE statements have the following considerations: Index maintenance If columns that are indexed are updated, the corresponding index entries must also be updated. In general, updating primary key values has particularly bad performance implications, so much so that some RDBMSs prohibit them. Row expansion When columns are updated in such a way that the row grows signi cantly in size, the row may no longer t in its original location, and there may not be free space around the row for it to expand in place (other rows might be right up against the one just updated). When this occurs, the row must either be moved to another location in the data le

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Figure 2-3

These requirements are hard-coded in the passfilt.dll file and cannot be changed through the user interface or the Registry. To enable strong passwords, you can make the following changes on your Windows NT systems: 1. Use Registry Editor (regedt32.exe) and open HKEY_LOCAL_MACHINE\ SYSTEM\CurrentControlSet\Control\Lsa. 2. If it does not already exist, add the value Notification Packages, of type REG_MULTI_SZ, under the LSA key. 3. Double-click the Notification Packages key and add the following value: PASSFILT. If the value FPNWCLNT is already present, place the PASSFILT entry beneath the FPNWCLNT entry. 4. Click OK and then exit Registry Editor. 5. Restart the computer. Another useful feature is the option to set the Windows NT screensaver to be Password Protected and set the Wait time to a short duration, such as 15 minutes. This will ensure that if users leave their machines unattended, the workstation will be locked, thereby preventing others from accessing information.

1. Which SQL statement should you use to add data to a table A. SELECT B. INSERT C. UPDATE D. DELETE B is the correct answer. 2. What two clauses are mandatory in an INSERT statement INSERT INTO and VALUES 3. In which clause in the INSERT statement do you identify the table that will receive the new data INSERT INTO 4. You create the following INSERT statement to add data to the PERFORMING_ARTISTS table: INSERT INTO PERFORMING_ARTISTS VALUES ( 12, 'Frank Sinatra' ); The PERFORMING_ARTISTS table includes three columns. What will happen when you try to execute this statement You ll receive an error because there are not enough values defined for the table and no columns have been specified to distinguish where the two values should be inserted. 5. What information must you specify in the VALUES clause of an INSERT statement You must specify one or more values to be inserted into the table.

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