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You can do the same on Linux or you can use a special script named mysqld_multi that allows you to use a single configuration script for multiple instances of the server (this script is not available on Windows). The script sets the correct parameters and then calls mysqld_safe or mysqld. To manage the multiple instances, you can use the MySQL Instance Manager tool (mysqlmanager, also available only on Linux) to monitor the servers and their status. You can use the tool to manage the servers either locally or remotely. You can use this technique to restrict access to your modified server. If you change the port number or socket, then only those who know the correct parameters can connect to the server. This will enable you to minimize risk of exposure of the modifications to the user population. If your development environment is diverse with a lot of experimentation and research projects that share the same resources (which is often the case in academia), you may also want to take these steps to protect your own experiments from contamination of and by other projects. This isn t normally a problem but it helps to take the precaution.

The AsyncAcquire method of the RequestGate type uses a design pattern called a holder. The object returned by this method is an IDisposable object that represents the acquisition of a resource. This holder object is bound using use, and this ensures that the resource is released when the computation completes or when the computation ends with an exception. Listing 13-13 shows that it s relatively easy to create sophisticated, scalable asynchronous programs using a mix of message passing and asynchronous I/O techniques. Modern web crawlers have thousands of outstanding open connections, indicating the importance of using asynchronous techniques in modern scalable web-based programming.

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Both page and control events are executed on the server, so when they are triggered, the parent page along with its view state is posted to the server, where the event is handled and a response (the same or another page) is sent back to the client A so-called postback occurs if a page posts information to the server requesting the same page back This round-trip scenario is quite common: the Reload button in Listing 14-2 or the Generate button from Listing 14-4 are both examples of triggering a postback In both of these cases, we have a postback because we remain on the same page; for example, the originating page handles the data submission by updating the content of a label (an HTML <span> element) in the button click handler More often, though, data is posted to another page, in which case it is referred to as cross-page posting.

Caution If you use binary, query, or slow query logs, you must also specify an alternative location for the

The final topics covered in this chapter are the various primitive mechanisms used for threads, sharedmemory concurrency, and signaling. In many ways, these are the assembly language of concurrency. This chapter has concentrated mostly on techniques that work well with immutable data structures. That isn t to say you should always use immutable data structures. It is, for example, perfectly valid to use mutable data structures as long as they re accessed from only one particular thread. Furthermore, private mutable data structures can often be safely passed through an asynchronous workflow, because at each point the mutable data structure is accessed by only one thread, even if different parts of the asynchronous workflow are executed by different threads. This doesn t apply to workflows that use operators such as Async.Parallel and Async.StartChild that start additional threads of computation. This means we ve largely avoided covering shared-memory primitives so far, because F# provides powerful declarative constructs such as asynchronous workflows and message passing that often

You can easily enable crosspage posting by setting the PostBackUrl property of the submitting control For instance, a SayHello button could be declared as follows: <asp:Button ID="btnSayHello" runat="server" Text="Greet" PostBackUrl="SayItaspx" /> There is a significant difference between how data submissions are handled via postback and cross-page posting: whereas the former is done in the submitting control s click event handler (for example, Reload_Click in the timer example), with cross-page posting the submission event is handled in the Load event handler of the page to which the postback URL points What slightly complicates matters is that the form data submitted is not available directly on the receiving page, but instead you have to reference it through the PreviousPage property of the page.

log files for each instance of the MySQL server. Failure to do so may result in corruption of your log files and/ or data.

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