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As a general rule of thumb, if you have five or more indexes on a table designed for online transaction processing (OLTP) operations, you probably need to reevaluate why those indexes exist Tables designed for read operations or data warehouse types of queries usually have many more indexes because little consideration needs to be taken for the impact of write operations..

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In addition to the performance degradation because of write operations, indexes are limited to a maximum row size of 900 bytes. This limitation can create a challenge when constructing more-complex covering indexes. An interesting new feature of indexes in SQL Server 2005 is called an included col umn. Included columns become part of the index at the leaf level only. Values from included columns do not appear in the root or intermediate levels of an index and do not count against the 900-byte limit for an index.

1. What are the two most important things to consider for nonclustered indexes 2. What requirement does a clustered index impose on storage

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HRESULT SetRibbonColor(UI_HSBCOLOR color); UI_HSBCOLOR ConvertRGBToHSB(COLORREF color); public: CRibbonColorSetter(REFPROPERTYKEY propertyKey); HRESULT Execute( UI_EXECUTIONVERB verb, const PROPERTYKEY* key, const PROPVARIANT* ppropvarValue, IUISimplePropertySet* pCommandExecutionProperties); }; CRibbonColorSetter *_pBackgroundColor; CRibbonColorSetter *_pHighlightColor; CRibbonColorSetter *_pTextColor; }; From Application.cpp CApplication::CApplication() : _pBackgroundColor(NULL), _pHighlightColor(NULL), _pTextColor(NULL) { } CApplication::~CApplication() { delete _pBackgroundColor; delete _pHighlightColor; delete _pTextColor; } STDMETHODIMP CApplication::OnViewChanged( UINT viewId, __in UI_VIEWTYPE typeId, __in IUnknown* pView, UI_VIEWVERB verb, INT uReasonCode) { if (verb != UI_VIEWVERB_CREATE && typeId != UI_VIEWTYPE_RIBBON) return E_NOTIMPL;

1. The number of indexes must be balanced against the overhead required to maintain them when rows are added, removed, or modified in the table. The order of the columns defined in the index need to be considered with the queries that can use them. This ensures that the first column in the index is used in the query, so the Optimizer uses the index. 2. A clustered index forces rows on data pages as well as data pages within the doubly linked list to be sorted by the clustering key.

In this exercise, you create a clustered index. The index is then disabled and reenabled. 1. Launch SSMS, connect to your instance, and open a new query window. 2. Change context to the AdventureWorks database. 3. Create a clustered index on the PostTime of the DatabaseLog table by executing the following query:

ON dbo.DatabaseLog(PostTime);

4. Run the following query to verify that data can be retrieved from the table:

SELECT * from dbo.DatabaseLog;

5. Disable the index by executing the following query:

ALTER INDEX ci_postdate ON dbo.DatabaseLog DISABLE;

_pBackgroundColor = new CRibbonColorSetter(UI_PKEY_GlobalBackgroundColor); _pHighlightColor = new CRibbonColorSetter(UI_PKEY_GlobalHighlightColor); _pTextColor = new CRibbonColorSetter(UI_PKEY_GlobalTextColor); return S_OK; } STDMETHODIMP CApplication::Execute(UINT nCmdID, UI_EXECUTIONVERB verb, __in_opt const PROPERTYKEY* key, __in_opt const PROPVARIANT* ppropvarValue, __in_opt IUISimplePropertySet* pCommandExecutionProperties) { if (*key != UI_PKEY_ColorType && nCmdID != cmdBackgroundColor && nCmdID != cmdHighlightColor && nCmdID != cmdTextColor) return E_NOTIMPL; switch (nCmdID) { case cmdBackgroundColor: return _pBackgroundColor->Execute(verb, key, ppropvarValue, pCommandExecutionProperties); case cmdHighlightColor: return _pHighlightColor->Execute(verb, key, ppropvarValue, pCommandExecutionProperties); case cmdTextColor: return _pTextColor->Execute(verb, key, ppropvarValue, pCommandExecutionProperties); } return S_OK; }

6. Verify that the table is now inaccessible by executing the following query:

SELECT * from dbo.DatabaseLog;

7. Reenable the clustered index and verify that the table can be accessed by execut ing the following query:

ALTER INDEX ci_postdate ON dbo.DatabaseLog REBUILD;

SELECT * from dbo.DatabaseLog;

In this exercise, you add a nonclustered index to the tables that were created previously. 1. Launch SSMS, connect to your instance, and open a new query window. Change context to the AdventureWorks database. 2. Because users commonly search for a customer by city, add a nonclustered index to the CustomerAddress table on the City column as follows:

CREATE NONCLUSTERED INDEX idx_CustomerAddress_City ON dbo.CustomerAddress(City);

CApplication::CRibbonColorSetter::CRibbonColorSetter(REFPROPERTYKEY propertyKey) : _propertyKey(propertyKey) { CComPtr<IPropertyStore> pPropertyStore; //Read the Ribbon original values and store them if (FAILED(g_pFramework->QueryInterface(&pPropertyStore))) { throw L"Error getting property store"; } PROPVARIANT propvarColor; pPropertyStore->GetValue(_propertyKey, &propvarColor); UIPropertyToUInt32(_propertyKey, propvarColor, (UINT *)&_originalColor); _currentColor = _originalColor; } HRESULT CApplication::CRibbonColorSetter::SetRibbonColor(UI_HSBCOLOR color) {

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