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This information is also helpful at development/testing time: it includes information about the source of the exception, a stack trace, and the exact source line at which the exception was thrown With all this information, you should be able to easily identify and fix bugs Exceptions cannot be ignored If your application throws an exception and doesn t handle it, the exception will ultimately be caught by the CLR There s no room for undisciplined coding, because the exception methodology is far less forgiving, and consequently your code will be more robust Exception-handling code is more manageable With result codes, you dealt with the result of each method immediately after the method call, which meant you had result-handling code all over your code files In contrast, you can collect all exception-handling code for a page in one place in the file.

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You can use isDefault="true" for one of your report style declarations to mark the default for elements that do not or cannot have another style specified.

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select col1, col2, count(*) from t1 group by col1, col2 ; SINGLE TABLE ACCESS PATH TABLE: T1 ORIG CDN: 5000 ROUNDED CDN: 5000 CMPTD CDN: 5000 Access path: tsc Resc: 3 Resp: 3 BEST_CST: 300 PATH: 2 Degree: 1 Grouping column cardinality [ COL1] 25 Grouping column cardinality [ COL2] 71 *************************************** GENERAL PLANS *********************** Join order[1]: T1[T1]#0 GROUP BY sort GROUP BY cardinality: 1256, TABLE cardinality: 5000 SORT resource Sort statistics Sort width: 58 Area size: 208896 Max Area size: 10485760 Degree: 1 Blocks to Sort: 10 Row size: 15 Rows: 5000 Initial runs: 1 Merge passes: 1 IO Cost / pass: 19 Total IO sort cost: 11 Total CPU sort cost: 0 Total Temp space used: 0 Best so far: TABLE#: 0 CST: 14 CDN: 5000 BYTES: 20000 Total Temp space used: 0 The first thing to note is the GROUP BY cardinality information.

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If something goes wrong, the CLR will catch up and direct execution to the handling code That makes the code faster and easier to maintain Cleanup code is more manageable Just like the exception-handling code, the cleanup code can go in a single place in the file Moreover, you can rely on it always being executed If you re used to using result codes, it means a change of habit However, exceptions are such a powerful technique that the effort required to learn a little about exceptions and exception handling will be effort well spent The benefits you will see in your code are quite significant..

The optimizer has picked up the num_distinct values for col1 and col2 separately in the single-table access details, and used them to produce a grouping cardinality in the general plans section But how do you get 1,256 from 25 and 71 Answer multiply them together and divide by the square root of 2 (1,256 = 24 * 71 / 14142) And in general, the optimizer estimates the number of distinct combinations of N columns by multiplying the individual num_distinct values, and then dividing by the square root of 2 (N 1) times As a sanity check, the optimizer compares this with the number of rows in the table, and reports the lower of the two values as the cardinality of the result set In 9i (and with the default value of _new_sort_cost_estimate unchanged), this has a knock-on effect on the cost.

Alternatively, the application itself can throw an exception. To do this, use the Throw keyword. For example, suppose you have a method called CalculateDiscount() that expects a parameter of type Double, which must be a nonnegative value. You can write code in this method to check the value passed, and throw an exception if the value is negative: Public Sub CalculateDiscount(ByVal money As Double) If money < 0 Throw new ArgumentException("money", _ "The money parameter can't be less than zero") ... End Sub

Earlier on in the chapter, I pointed out that you will often see that the Total IO sort cost is (Blocks to Sort + IO Cost per pass) / 2: in this example this would be (10 + 19) / 2, which would be reported as 15 But the Total IO sort cost is reported as 11 Something has changed (In 8i, and allowing for the small changes due to rounding errors, etc, you would see the equivalent of 15 as the total I/O sort cost) The difference is interesting from 9i onwards, the cost has been adjusted to allow for the fact that the number of rows returned by the query is less than the total number of rows in the.

Each report style definition can reference another style definition from which it will inherit some or all of its properties. The style attribute specifies the name of the parent report style.

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