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sometimes find DBAs sounding quite apologetic about having added code to generate statistics somewhere in the middle of a data-loading job. This approach is perfectly reasonable whenever the data changes, especially if the change in volume is significant, the statistics may have to change. Gathering stats once every 24 hours in the middle of the night may be an adequate strategy for many systems, but it should be viewed only as a starting point (one of several possible) that is likely to need refining.

Note Often developers think that writing Generic code is similar to writing classical object-oriented code.

Based on this definition, an informal argument about the query would be that we are aiming for 1,000 rows from the base table, and the restriction to one description out of 20 (rownum <= 20) in the reference table will give us 50 rows in the final result set. Here s the execution plan: Execution Plan (9.2.0.6 autorace) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=287 Card=50 Bytes=1950) 1 0 HASH JOIN (Cost=287 Card=50 Bytes=1950) 2 1 TABLE ACCESS (FULL) OF 'TYPE1' (Cost=2 Card=1 Bytes=20) 3 1 TABLE ACCESS (FULL) OF 'T1' (Cost=284 Card=1001 Bytes=19019) Sure enough, the calculated cardinality for the join is 50 rows. We can check the formulae presented in their simplest form given we have no null values to worry about: Join Selectivity = 1 / greater(20, 20) = 1/20 Join Cardinality = 1/20 * (20/20 * (500,000 * 1001/500000)) = 50

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Csla.DataPortal always throws a Csla.DataPortalException in case of failure. You must use either its InnerException or BusinessException properties, or the GetBaseException() method to retrieve the original exception that occurred.

Remember that each rule method accepts a target parameter, which is the object containing the data to be validated. This target is always the business object, so ValidationRules keeps a reference to the business object. This reference is provided via the constructor and can be reset through the SetTarget() method both of which you ve seen in the implementation of Csla.Core.BusinessBase: [NonSerialized()] private object _target; internal ValidationRules(object businessObject) { SetTarget(businessObject); } internal void SetTarget(object businessObject) { _target = businessObject; } Notice that the _target field is marked as [NonSerialized()]. This is important because otherwise the BinaryFormatter would trace the circular reference between the business object and the ValidationRules object, causing a bloated serialization byte stream. No failure would result, but the size of the byte stream would be larger than needed, which might cause a performance issue in some cases.

Here is some general information about tables, regardless of their type: A table can have up to 1,000 columns, although I recommend against a design that does contain the maximum number of columns, unless there is some pressing need. Tables are most efficient with far fewer than 1,000 columns. Oracle will internally store a row with more than 254 columns in separate row pieces that point to each other and must be reassembled to produce the entire row image. A table can have a virtually unlimited number of rows, although you will hit other limits that prevent this from happening. For example, typically a tablespace can have at most 1,022 files (although there are BIGFILE tablespaces in Oracle 10g that will get you beyond these file size limits, too). Say you have a typical tablespace and are using files that are 32GB in size that is to say, 32,704GB (1,022 files time

Given that .NET Framework 2.0 provides three fully functional controls, there are times when you will have to programmatically access not only the site navigation, but also where the end users last visited and what they are able to navigate to next. This type of functionality is important. Often in web applications, you as the developer want to perform certain actions based on where the end user currently is. Because these actions will be implemented in code, you will have to retrieve this information from the Site Navigation API. This can be implemented by starting with the SiteMap class from the .NET Framework.

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