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InnoDB s clustered indexes work well for both single value searches and range queries. You will often have the option of choosing a couple of different fields to be your primary key. For instance, assume a customer_orders table, containing an order_id column (of type INT), a customer_id field (foreign key containing an INT), and an order_created field of type DATETIME. You have a choice of creating the primary key as the order_id column or having a UNIQUE INDEX on order_created and customer_id form the primary key. There are cases to be made for both options. Having the clustering key on the order_id field means that the clustering key would be small (4 bytes as opposed to 12 bytes). A small clustering key gives you the benefit that all of the secondary indexes will be small; remember that the clustering key is paired with secondary index keys. Searches based on a single order_id value or a range of order_id values would

Figure 22-2. WinHelp 95: a facelift The standardized table of contents was both the most significant advance and the most obvious limitation of WinHelp 95. The obvious problem is that users often need to jump back and forth between the table of contents and the topic pages before they find the content they need. This process is tedious, and it feels complicated because there can be multiple windows scattered about the desktop. To create a WinHelp 95 file, you write the content in one or more Rich Text Format (.rtf) files. These files are then put through a compilation process that creates a linked, compact binary format. The easiest way to generate WinHelp 95 files (or any other standard of Help file) is with a dedicated Help-authoring program.

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be lightning fast. But, more than likely, range queries issued against the orders database would be filtered based on the order_created date field. If the order_created/customer_id index were a secondary index, range queries would be fast, but would require an extra lookup to the data page to retrieve record data. On the other hand, if the clustering key were put on a UNIQUE INDEX of order_created and customer_id, those range queries issued against the order_created field would be very fast. A secondary index on order_id would ensure that the more common single order_id searches performed admirably. But, there are some drawbacks. If queries need to be filtered by a single or range of customer_id values, the clustered index would be ineffective without a criterion supplied for the leftmost column of the clustering key (order_created). You could remedy the situation by adding a secondary index on customer_id, but then you would need to weigh the benefits of the index against additional CPU costs during INSERT and UPDATE operations. Finally, having a 12-byte clustering key means that all secondary indexes would be fatter, reducing the number of index data records InnoDB can fit in a single 16KB data page. More than likely, the first choice (having the order_id as the clustering key) is the most sensible, but, as with all index optimization and placement, your situation will require testing and monitoring.

The next version of WinHelp was named HTML Help, because the source files were written in HTML markup instead of Rich Text Format. HTML Help debuted with Windows 98 and also shipped with Internet Explorer 4. A common source of confusion about HTML Help is the idea that it is somehow supposed to provide help over the Web or browser-integrated Help. While

If you recall from 9, creating a queue consists of two steps creating the queue table to store queue messages and registering the actual queue itself. ODT.NET makes this process easier as well by providing GUIs to create and manage these queue objects. You can create a queue table by navigating to the Advanced Queues Queue Tables node in the Server Explorer, right-clicking it, and choosing the New Queue Table menu item. This will display the window shown in Figure 14-28. The Payload Type box allows you to choose between XML, RAW, and UDT-type payloads. The Storage tab allows you to specify detailed size dynamics for the queue table. Through this window, you can also specify if the queue supports multiple consumers.

HTML Help depends on some components that are also used in Internet Explorer, it really has little to do with the Internet. Instead, HTML Help is an improvement to WinHelp that combines the table of contents and topic views in the same window (see Figure 22-3).

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