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This is necessary if the operating system that you are compiling for does not map the TLS segment to cover the entire TLS area -momit-leaf-frame-pointer: Specifying this option tells GCC not to keep the frame pointer in a register for leaf functions This avoids generating the instructions to save, set up, and restore frame pointers and makes an extra register available in leaf functions The option -fomit-frame-pointer removes the frame pointer for all functions, which might make debugging harder -mpentium: This option is a deprecated synonym for the -mtune=i586 and -mtune=pentium options -mpentiumpro: This option is a deprecated synonym for the -mtune=i686 and -mtune=pentiumpro options -mpreferred-stack-boundary=num: Specifying this option tells GCC to attempt to keep the stack boundary aligned to a 2**num byte boundary This extra alignment consumes extra stack space and generally increases code size.

(7 row(s) affected)

Code that is sensitive to stack space usage, such as embedded systems and operating system kernels, may want to reduce the preferred alignment to -mpreferred-stack-boundary=2 If the -mpreferred-stack-boundary option is not specified, the default is 4 (16 bytes or 128 bits), except when optimizing for code size (using the -Os option), in which case the default is the minimum correct alignment (4 bytes for x86, and 8 bytes for x86-64) On Pentium and Pentium Pro systems, double and long double values should be aligned to an 8-byte boundary (see the -malign-double option), or they will incur significant runtime performance penalties On Pentium III systems, the SSE datatype __m128 incurs similar penalties if it is not 16-byte aligned..

In this example, the CTE name and columns are defined first: WITH CompanyTree(ParentCompanyID, CompanyID, CompanyName, CompanyLevel) The CTE query definition began with AS and an open parenthesis: AS ( The SELECT clause began with the anchor SELECT statement. When using recursive CTEs, anchor refers to the fact that it defines the base of the recursion in this case the top level of the corporate hierarchy (the parentless Mega-Corp ). This SELECT also includes a CompanyLevel column alias, preceded with the number zero. This column will be used in the recursion to display how many levels deep a particular company is in the company hierarchy: SELECT ParentCompanyID, CompanyID, CompanyName, 0 AS CompanyLevel FROM dbo.Company

To ensure proper alignment of the values on the stack, the stack boundary must be as aligned as required by any value stored on the stack. Therefore, every function and library must be generated such that it keeps the stack aligned. Calling a function compiled with a higher preferred stack boundary from a function compiled with a lower preferred stack boundary will probably misalign the stack. The GNU folks recommend that libraries that use callbacks always use the default setting.

Next was the UNION ALL, to join the second, recursive query to the anchor member (UNION ALL, and not just UNION, is required for the last anchor member and the first recursive member in a recursive CTE): UNION ALL After that was the recursive query. Like the anchor, the SELECT clause references the ParentCompanyID, CompanyID, and CompanyName from the dbo.Company table. Unlike the anchor, the CTE column references p.CompanyLevel (from the anchor query), adding + 1 to its total at each level of the hierarchy: SELECT c.ParentCompanyID, c.CompanyID, c.CompanyName, p.CompanyLevel + 1 The dbo.Company table was joined to the CompanyTree CTE, joining the CTE s recursive query s ParentCompanyID to the CTE s CompanyID: FROM dbo.Company c INNER JOIN CompanyTree p ON c.ParentCompanyID = p.CompanyID ) After the closing of the CTE s definition, the query selected from the CTE based on the columns defined in the CTE definition. SELECT ParentCompanyID, CompanyID, CompanyName, CompanyLevel FROM CompanyTree In the results, for each level in the company hierarchy, the CTE increased the CompanyLevel column. With this useful new feature come some cautions, however. If you create your recursive CTE incorrectly, you could cause an infinite loop. While testing, and to avoid infinite loops, use the MAXRECURSION hint mentioned earlier in the chapter. For example, you can stop the previous example from going further than 2 levels by adding the OPTION clause with MAXRECURSION at the end of the query: WITH CompanyTree(ParentCompanyID, CompanyID, CompanyName, CompanyLevel) AS ( SELECT ParentCompanyID, CompanyID, CompanyName, 0 AS CompanyLevel FROM dbo.Company WHERE ParentCompanyID IS NULL UNION ALL SELECT c.ParentCompanyID, c.CompanyID, c.CompanyName, p.CompanyLevel + 1 FROM dbo.Company c INNER JOIN CompanyTree p ON c.ParentCompanyID = p.CompanyID ) SELECT ParentCompanyID, CompanyID, CompanyName, CompanyLevel FROM CompanyTree OPTION (MAXRECURSION 2) This returns: