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If the parents of the function cannot be determined, the word '<spontaneous>' is printed in the `name' field, and all the other fields are blank. For the function's children, the fields have the following meanings: self This is the amount of time that was propagated directly from the child into the function.

And fern.png looks like the image shown in Figure 7-62.

In the setup of this example, an insert is attempted to the Purchasing.VendorContact table: INSERT Purchasing.VendorContact (VendorID, ContactID, ContactTypeID) VALUES (93, 643, 888) The insert fails, returning the following error message: Msg 547, Level 16, State 0, Line 1 The INSERT statement conflicted with the FOREIGN KEY constraint "FK_VendorContact_ContactType_ContactTypeID". The conflict occurred in database "AdventureWorks", table "ContactType", column 'ContactTypeID'. The statement has been terminated. Next, the foreign key constraint that caused the previous error message will be disabled using NOCHECK: ALTER TABLE Purchasing.VendorContact NOCHECK CONSTRAINT FK_VendorContact_ContactType_ContactTypeID The insert is then attempted again: INSERT Purchasing.VendorContact (VendorID, ContactID, ContactTypeID) VALUES (93, 643, 888) This time it succeeds: (1 row(s) affected) We can then DELETE the newly inserted row, so as not to leave data integrity issues once the constraint is re-enabled: DELETE Purchasing.VendorContact WHERE VendorID = 93 AND ContactID = 643 AND ContactTypeID = 888 To re-enable checking of the foreign key constraint, CHECK is used in an ALTER TABLE statement: ALTER TABLE Purchasing.VendorContact CHECK CONSTRAINT FK_VendorContact_ContactType_ContactTypeID To disable or enable all CHECK and FOREIGN KEY constraints for the table, you should use the ALL keyword, as this example demonstrates: -- disable checking on all constraints ALTER TABLE Purchasing.VendorContact NOCHECK CONSTRAINT ALL

children This is the amount of time that was propagated from the child's children to the function. called This is the number of times the function called this child '/' the total number of times the child was called. Recursive calls by the child are not listed in the number after the '/'. name This is the name of the child. The child's index number is printed after it. If the child is a member of a cycle, the cycle number is printed between the name and the index number.

Disabling all CHECK and FOREIGN KEY constraints for a table should only be performed when absolutely necessary. Re-enable all constraints when you are finished.

If there are any cycles (circles) in the call graph, there is an entry for the cycle-as-a-whole. This entry shows who called the cycle (as parents) and the members of the cycle (as children.) The '+' recursive calls entry shows the number of function calls that were internal to the cycle, and the calls entry for each member shows, for that member, how many times it was called from other members of the cycle. Index by function name [1] calc_fib

In this recipe, an insert was attempted against Purchasing.VendorContact with a ContactTypeID that didn t exist in the primary key table. The insert causes a conflict with the FK_VendorContact_ContactType_ContactTypeID foreign key constraint. To disable the constraint from validating new values, ALTER TABLE and NOCHECK CONSTRAINT were used: ALTER TABLE Purchasing.VendorContact NOCHECK CONSTRAINT FK_VendorContact_ContactType_ContactTypeID After disabling the constraint with NOCHECK, the ContactTypeID value was then allowed to be inserted, even though it doesn t exist in the primary key table. The recipe finished by re-enabling the constraint again, and deleting the value just inserted (using CHECK instead of NOCHECK): ALTER TABLE Purchasing.VendorContact CHECK CONSTRAINT FK_VendorContact_ContactType_ContactTypeID The next example demonstrated disabling all foreign key and check constraints on a table using the ALL keyword: NOCHECK CONSTRAINT ALL All constraints for the table were then re-enabled using the following code: CHECK CONSTRAINT ALL.

If you don t know the value of a column in a row when it is first inserted into a table, you can use a DEFAULT constraint to populate that column with an anticipated or non-NULL value. The syntax for designating the default value in the column definition of a CREATE TABLE is as follows: DEFAULT constant_expression The constant_expression is the default value you wish to populate into the column when the column s value isn t explicitly specified in an INSERT. This example demonstrates setting the default value of the EducationTypeID column to 1 : CREATE TABLE Person.EmployeeEducationType( EmployeeEducationTypeID int NOT NULL PRIMARY KEY, EmployeeID int NOT NULL, EducationTypeID int NOT NULL DEFAULT 1, GPA numeric(4,3) NOT NULL )