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By executing some test queries, it becomes apparent which columns of the USER_CONSTRAINTS view you need. Let s look at a first attempt to generate the ALTER TABLE commands. Solution 11-4a. First Attempt to Generate the Correct SQL SQL> select 'ALTER TABLE '||table_name||' DISABLE CONSTRAINT 2 '||constraint_name||';' 3 from user_constraints; However, if you capture the output from this query in a script file and execute it, you will discover that there is room for improvement. Some ALTER TABLE commands may fail with the following message: ORA-02297: cannot disable constraint (BOOK.xxx) - dependencies exist You can fix this problem in two ways: Add the CASCADE keyword to the generated ALTER TABLE commands. Sort the ALTER TABLE commands in such a way that all primary keys are disabled before the foreign key constraints.

Besides having the ability to design good indexes, it is also important to be able to identify which indexes are used more heavily and which are rarely or never used. You don't want to keep indexes that are rarely used, as they do have negative performance effects on modifications. In SQL Server 2000, the only available techniques to determine index usage were very awkward, to say the least. For example, you could take a script that contains a representative sampling of the queries that run in the system and produce textual SHOWPLAN information for the queries in the script. You could write an application that parses the output, extracts the names of the indexes that are used, and calculates index usage statistics. Obviously, it's a problematic technique that also requires a fair amount of effort. Another option you could use in SQL Server 2000 is to run the Index Tuning Wizard (ITW) based on a sample workload. Among the reports that ITW generates is a report that shows you usage statistics of the existing indexes for the input queries. In SQL Server 2005, you have much more powerful and convenient tools to work with. You get a DMF called dm_db_index_operational_stats and a DMV called dm_db_index_usage_stats . The dm_db_index_operational_stats DMF gives you low-level I/O, locking, latching, and access method activity information. You provide the function a database ID, object ID, index ID (or 0 for a heap), and partition ID. You can also request information about multiple entities by specifying a NULL in the relevant argument. For example, to get information about all objects, indexes, and partitions in the Performance database, you would invoke the function as follows: SELECT * FROM sys.dm_db_index_operational_stats( DB_ID('Performance'), null, null, null);

As you probably remember from 4, the rst ve slides work their magic by appealing primarily to emotion. One of the most effective ways to enhance your appeal to emotion is by adding a full-screen photograph to the slide. If that s the way you want to go in this example, sketch a photo of a magazine cover with a headline about declining returns, as shown on the upper-left slide in Figure 7-4.

if ( bIsDate==false ) { alert( Invalid Date ); } return (bIsDate); }

/VERBOSE (Print Progress Messages) /VERBOSE:LIB (Print Libraries Searched Only Progress Messages) If you're having trouble linking, these messages can show you what symbols the linker is looking for and where it finds them The output can get voluminous, but it can show you where you're having a build problem I've used /VERBOSE and /VERBOSE:LIB when I've had an odd crash because a function being called didn't look, at the assembly-language level, anything like I thought it should It turned out that I had two functions with identical signatures, but different implementations, in two different libraries, and the linker was finding the wrong one You can set these switches in the project Property Pages dialog box, Linker folder, General property page, Show Progress property 47.

statements. You can place messages only in the specified queue, but how the queue is polled and how the message is interpreted is strictly application-specific. This is where the SqlDependency class gets in the game. The SqlDependency class provides a high-level abstraction of the notification mechanism and allows you to set an application-level dependency on the query so changes in the server can be immediately communicated to the client application. The following code binds a command to a SQL dependency:

In SQL Server 2008 the output of the INSERT SELECT method was similar to the output I got for the corresponding SELECT INTO test, indicating minimal logging in both cases: