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Although this is a replication of data, it's a value-added replication in the sense that it's a calculation on data in other tables The good news is that finding the order subtotal is much easier The bad news is that any changes to that order will cause the SUBTOTAL column to be updated However, this isn't that bad: Most orders are submitted and never changed Only the few that are updated require a recalculation, so the overhead is minimal When discussing denormalization, it's good to weigh performance against the risks of replicating data In terms of our priorities, there's no contest: It's obviously more important to be correct than fast From a performance standpoint, however, we want to reduce this effect For efficiency, it's generally acceptable to denormalize your model as necessary Note the key phrase "as necessary" I strongly advise you to first normalize and then denormalize This ensures that your model will be as space efficient as possible, with the exception of a few patches where you've traded space efficiency for performance Performance aside, there's no reason to denormalize, so we want to limit such changes As with many other things we've discussed, simpler is better, so we'll denormalize only when we really must Many designers denormalize their models after deployment, when working on a more optimized version of the server side of the application It's sometimes very difficult to know what data should be located with other data until the applications are written and an initial deployment phase has occurred In summary, denormalization can be a performance-useful and even reasonable technique if it's done correctly Here are some specific tips about denormalization, from a purely performance standpoint:

be used server-side Thus, for the server to use a CHerculesData object, it must receive a copy of the data each heap descriptor pointer addresses The CHerculesData class must have utility code which puts all its member data into a descriptor client-side ( externalization ) and corresponding code to recreate it from the descriptor server-side ( internalization ) There is a standard technique for this, as shown below:

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Consider denormalization only if you're sure that application bottlenecks are being caused by excessive navigation of the data model at runtime Where possible, limit your denormalization to attributes that either don't change or change rarely Replicating frequently updated data can make maintenance a nightmare: You may spend more time replicating data (to manually enforce consistency) than you save by denormalizing in the first place If simplicity and consistency of queries are the only concern, consider creating views or stored procedures A view enables you to retain your normalized model but hide the complexity involved in locating data A stored procedure does the same and has an added performance benefit The only negative is that more development is required and the stored procedure is less portable (between databases) If you denormalize, identify value-added denormalizations, such as those where you can precompute something that would normally have to be computed at runtime This is particularly useful when it comes to applications that mine or otherwise analyze old data

Following the UK model, the code has been implemented on a comply-or-explain basis Despite this important advance, some view wide-spread corruption and political interference with the judiciary as a continuing obstruction to the rule of law in China

Without denormalization, each user who wants to analyze this data will force the computation (potentially very expensive) to be redone even though the underlying data hasn't changed

class CHerculesData : public CBase { public: IMPORT_C static CHerculesData* NewLC(const TDesC8& aDes1, const TDesC8& aDes2, TInt aVal); static CHerculesData* NewLC(const TDesC8& aStreamData); IMPORT_C CHerculesData(); // Other methods omitted public: // Creates an HBufC8 representation of this IMPORT_C HBufC8* MarshalDataL() const; protected: // Writes this to the stream void ExternalizeL(RWriteStream& aStream) const; // Initializes this from stream void InternalizeL(RReadStream& aStream); protected: CHerculesData(TInt aVal); CHerculesData(){}; void ConstructL(const TDesC8& aDes1, const TDesC8& aDes2); protected: HBufC8* iDes1; HBufC8* iDes2; TInt iVal; }; // Maximum size expected for iDes1 and iDes2 in CHerculesData const TInt KMaxHerculesDesLen = 255; // Maximum total size expected for a CHerculesData object const TInt KMaxCHerculesDataLength = 520; EXPORT_C CHerculesData* CHerculesData::NewLC(const TDesC8& aDes1, const TDesC8& aDes2, TInt aVal) { CHerculesData* data = new (ELeave) CHerculesData(aVal); CleanupStack::PushL(data); data->ConstructL(aDes1, aDes2); return (data); } // Creates a CHerculesData initialized with the contents of the // descriptor parameter CHerculesData* CHerculesData::NewLC(const TDesC8& aStreamData) {// Reads descriptor data from a stream // and creates a new CHerculesData object CHerculesData* data = new (ELeave) CHerculesData(); CleanupStack::PushL(data); // Open a read stream for the descriptor

Africa and Latin America In South Africa, the adoption of the King Report on Corporate Governance for South Africa 2002 provides a governance framework for those companies listed on the Johannesburg Stock Exchange The King Report and the United Kingdom s Combined Code have few differences Both are applied on the comply-orexplain basis Also of interest, the Johannesburg Stock Exchange is preparing to launch the Socially Responsible Index to measure the social, environment, and economic effects of top South African companies Corporate governance practices will be one criterion for inclusion in the index In Latin America, corporate governance reforms remain elusive It is common for companies based in Latin America to have controlling shareholders, therefore, minority shareholder rights reform remains the most visible issue in these markets While Argentina, Brazil, Chile, and Mexico have passed laws strengthening minority shareholder rights, enforcement is inconsistent The Organization for Economic Cooperation and Development (OECD) and World Bank sponsored the Latin American Roundtable on Corporate Governance in November of 2003 that established a blueprint for regional reform It advocates creating stronger regulatory oversight, safeguarding minority rights, adopting international accounting standards, and limiting cronyism throughout the region

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