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Now that we know what kinds of indexes exist, let s discuss some of the basics of index design Remember, we don t create indexes on every column of a table The cost is too high Additionally, we can have only one clustered index The clustered index is typically set on the PRIMARY KEY It s set that way by default, but can be changed if necessary

So to run a fast marathon time, you must not hit the wall During the race, this more or less comes down to making good decisions about how to respond to events as they unfold stuff like whether to speed up or slow down relative to the display on a split clock or whether to follow a surging runner or remain in the chase pack In the same way, you have to be smart about how JavaScript behaviors respond to events, with things such as visitors moving their mouse or the page loading in order to prevent the browser from developing rigor mortis Why would JavaScript freeze the browser anyway For one, whenever some JavaScript code is running, the browser cannot do any repaints, reflows, or any other UI updates So, a button clicked while JavaScript is executing may never look like it was clicked.

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Since it s not feasible to create indexes on all columns, but some indexes are worthwhile, we must decide which columns to create the indexes on Indexes are created on PKs to enforce uniqueness, but beyond that, the primary reason to create an index on a column is to optimize queries that are used often If a column is rarely used in a query, it is not a good candidate for an index EXAM TIP You should have a solid understanding of when to create indexes and when not to create indexes The following bulleted list identifies columns that are good candidates for indexes and thus should be committed to memory Columns that are good candidates for indexes are:

For another, while a JavaScript file is downloading, a browser cannot download any other kind of file Therefore, CSS and image downloads are temporarily blocked, both while a JavaScript file downloads and executes, typically causing a blank white page But not to worry we will explore not only how to respond to events but also how to be quick about it Insofar as JavaScript responds to events by running functions, referred to as event listeners, this typically means coding snappy functions Some techniques for doing so, such as optimizing loops, are already in your bailiwick Others, such as advance conditional loading, are new but well within your grasp..

Primary keys and foreign keys PKs must have indexes, and clustered indexes are created by default FKs are used in join operations, so it is very common to have indexes created on FKs Columns that are frequently referenced in queries If the column is frequently referenced in a query, then having it in an index can speed up the queries Columns that are searched for ranges of key values (with WHERE clauses) A range of key values includes clauses such as WHERE @Value > 100 or WHERE

A couple of notes before start coding: first, to respond to an event, you have to tell JavaScript to listen for it as it traverses the DOM tree. In Internet Explorer 9, Firefox, Safari, Chrome, and Opera, you can tell JavaScript to listen while an event either descends (capturing phase) or ascends (bubbling phase) the DOM tree. In Internet Explorer 8 or earlier, JavaScript can listen only during the bubbling phase. How do you know the who, what, when, where, and how of an event Those details are provided by the members of an event object that Internet Explorer 9, Firefox, Safari, Chrome, and Opera pass as the sole parameter to an event listener function. Internet Explorer 8 or earlier, on the other hand, saves its event object to the global variable, event, that is, to window.event. As you might imagine, window.event is constantly being overwritten by Internet Explorer. However, even though this is a bit of a kludge, it works for the reason that no two events ever take place at the same moment in time. Note that

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