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Specifying a MERGE algorithm tells the query parser to attempt to combine the incoming SQL statement with the SELECT statement that defines the view and create one SQL statement to process. If MySQL can do this, it can run just one query, which is more efficient than creating a temporary table. For this reason, MERGE is the preferred algorithm. To demonstrate how this works, let s look at the view we used in Listing 12-2 and see how a SELECT statement could be combined with the view definition. Here is the statement to create the customer_region1 view using the MERGE algorithm: CREATE ALGORITHM = MERGE VIEW customer_region1 AS SELECT customer_id, name FROM customer WHERE region = 1; Let s say we wanted to get the name of the customer with customer_id of 1 from this view. The SELECT statement would look like this: SELECT name FROM customer_region1 WHERE customer_id = 1; With a MERGE algorithm, MySQL combines the query with the SELECT statement in the view definition to come up with a single query to execute: SELECT name FROM customer WHERE customer_id = 1 AND region = 1; In this case, MySQL used the column name from the incoming SELECT and combined the WHERE clauses from both the incoming query and the SELECT statement that defines the customer_region1 view.

Console.WriteLine("Before WaitOne ") Dim b As Boolean = mansig.WaitOne(1000, False) Console.WriteLine("After WaitOne {0}", b) Console.ReadLine() End Sub End Class End Namespace The output from NETThreadEvents with a value of False is Before WaitOne After WaitOne False In NETThreadEvents, a ManualResetEvent object is created with a value of False. The Boolean value False set the initial state of the ManualResetEvent object to nonsignaled. Next we call the WaitOne() method of the base-class WaitHandle. The WaitOne() method takes two parameters. The first one is the number of milliseconds the thread should wait at the WaitOne() method; the thread therefore waits for 1 second before quitting. The second parameter is exitContext, which is set to True if you want to exit the synchronization domain for the context before the wait (if in a synchronized context), and reacquire it; otherwise it s False. The program blocks for 1 second at the WaitOne() method and then quits because of the timeout. The state of the ManualResetEvent is still False, thus the Boolean b returned by WaitOne() is False. Now let s figure out what will happen if we set the state of ManualResetEvent to signaled (True): Imports System Imports System.Threading Namespace NETThreadEvents Public Class NonSignaledManual Public Shared Sub Main() Dim mansig As ManualResetEvent mansig = New ManualResetEvent(True) Console.WriteLine("Before WaitOne ") Dim b As Boolean = mansig.WaitOne(1000, False) Console.WriteLine("After WaitOne {0}", b) Console.ReadLine() End Sub End Class End Namespace The output from NETThreadEvents with a value of True is Before WaitOne After WaitOne True

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When the view doesn t represent a one-to-one relationship with records in the underlying tables, MERGE isn t allowed. A relationship between the view and its underlying tables that is not one-to-one is created by using aggregation functions (SUM(), MIN(), MAX(), and so on) or by using the DISTINCT, GROUP BY, HAVING, and UNION keywords. In instances where the MERGE algorithm isn t allowed, the database switches the ALGORITHM value to UNDEFINED.

Example 6-13. Contact Object Definition define contact{ contact_name service_notification_commands address1 }

The TEMPTABLE algorithm forces a view to load the data from the underlying tables into a temporary table, using the SELECT statement that defines the view. Once the data is loaded to the temporary table, the incoming statement is executed against the temporary table. Using a temporary table for a view adds overhead because all the data must be moved into the temporary table before the incoming statement can be processed. However, moving the data to a temporary table means the underlying tables can be released from any locks while the temporary table is used to finish the execution of the query. In some systems, minimal lock time is important. The TEMPTABLE option for views will mean the least amount of lock time for the view s underlying tables. Views that reference only literal values are required to use a temporary table. Views that use temporary tables are never updatable. Updatable views are covered in the Creating Updatable Views section later in the chapter.

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