Expert Oracle Application Express by Doug Gault, Dimitri Gielis, Martin DSouza

By Doug Gault, Dimitri Gielis, Martin DSouza

Professional Oracle program convey, 2d variation is newly up-to-date for APEX 5.0 and brings deep perception from the superior APEX practitioners within the box this present day. You'll find out about very important gains in APEX 5.0, and the way these may be utilized to make your improvement paintings more straightforward and with larger influence in your company. Oracle program exhibit (APEX) is a wholly web-based improvement framework that's equipped into each version of Oracle Database. The framework rests upon Oracle’s robust PL/SQL language, permitting energy clients and builders to swiftly advance purposes that simply scale to enormous quantities, even hundreds of thousands of concurrent clients. APEX has obvious meteoric development and is changing into the instrument of selection for ad-hoc program improvement within the enterprise.

The many authors of specialist Oracle software convey, second version construct their careers round APEX. They be aware of what it takes to make the product sing―developing safe purposes that may be deployed globally to clients inside and out a wide company. The authors come jointly during this ebook to proportion a few of their inner most and strongest insights into fixing the tricky difficulties surrounding globalization, configuration and lifecycle administration, and extra. New during this variation for APEX 5.0 is assurance of Oracle relaxation information providers, map integration, jQuery with APEX, and the hot web page Designer.

You’ll find out about debugging and function, deep secrets and techniques to customizing your software u

ser interface, tips to safe purposes from intrusion, and approximately deploying globally in a number of languages. professional Oracle software convey, second variation is actually a publication that may flow you and your skillset a huge step in the direction of the apex of program convey development.
Contains all-new content material on Oracle relaxation facts prone, jQuery in APEX, and map integration
Addresses globalization and different issues of enterprise-level development
Shows tips on how to customise APEX to your personal program wishes

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In other words, the optimizer’s execution plan may not be exactly the run-time execution path, and the speed of the run-time execution path may be affected by an unlucky choice of data. You will see examples of this in Chapter 9. Summary The main purpose of this very short chapter is to warn you that there are no quick and snappy answers to questions like Why did Oracle do X? At the very least, you have three optimizer modes and two (possibly three) major versions of Oracle to check before you start to formulate an answer.

This is because the default value in 10g for the parameter optimizer_dynamic_sampling is 2 (which means use dynamic sampling on any table without statistics), rather than 1, as it was in 9i. Another parameter associated with the optimizer_mode is optimizer_goal. ora). So What Is the Cost? One of the commonest questions about the CBO on the Internet is What does the cost represent? This is usually followed by comments like According to explain plan, the cost of doing a hash join for this query is 7 million and the cost of a nested loop is 42—but the hash join completes in 3 seconds and the nested loop takes 14 hours.

Oracle can do all sorts of transformations to your SQL before optimizing it. This means that an execution plan you were expecting to see may have been eliminated by a transformation before the optimizer started to do any costing. On the positive side, though, the basic arithmetic is always the same. Cunning refinements, little tweaks, new features, and dirty tricks are thrown in to confuse the issue—but 95% of everything that the optimizer does can be described and explained reasonably accurately in just a few chapters.

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