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Some new keywords were introduced in the C++/CLI bindings. Many new keywords introduced in C++/CLI are sensitive to the context in which they are used, so as to avoid creating new reserved words in order not to interfere with existing identifiers. When used in the proper syntactic position, contextual keywords are interpreted with the keyword meaning. When used in any other position, they may be used as identifiers. This enables your code to continue to use a variable that happens to collide with a C++/CLI contextual keyword without any special marking or modification. This also enables C++/CLI to use keywords that otherwise would be common variable names. There are several new keywords that are not contextual, as described in Table A-1: gcnew, generic, and nullptr. Table A-2 shows the new contextual keywords.

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select /*+ full(t1) */ rowid, date_ord, seq_ord, small_vc from t1 where rownum <= 10 ; ROWID -----------------AAAMJHAAJAAAAAKAAA AAAMJHAAJAAAAAKAAB AAAMJHAAJAAAAAKAAC AAAMJHAAJAAAAAKAAD AAAMJHAAJAAAAAKAAE AAAMJHAAJAAAAAKAAF AAAMJHAAJAAAAAKAAG AAAMJHAAJAAAAAKAAH AAAMJHAAJAAAAAKAAI AAAMJHAAJAAAAAKAAJ DATE_ORD SEQ_ORD SMALL_VC --------- ---------- ---------18-FEB-04 1 A1 18-FEB-04 2 B1 18-FEB-04 3 C1 18-FEB-04 4 A2 18-FEB-04 5 D1 18-FEB-04 6 E1 18-FEB-04 7 B2 18-FEB-04 8 D2 18-FEB-04 9 B3 18-FEB-04 10 E2

[Type text]

Remember that the extended rowid is made up of the following: object_id Relative file_id Block within file Row within block First six letters (AAAMJH) Next three letters (AAJ) Next six letters (AAAAAK) Last three letters (AAA, AAB, AAC ...)

Allocates instances of reference types on the garbage-collected (managed) heap Declares a parameterized type (generic) that is recognized by the runtime Evaluates to the null value for a pointer, indicating an unassigned pointer

All these rows are in the same block (AAAAAK). In my test run, I populated the column small_vc with a tag that could be used to identify the process that inserted the row. All five of our processes were busy hitting the same table block at the same time. In a very busy system (in particular, one with a high degree of concurrency), we might have seen lots of buffer busy waits for blocks of class data block for whichever one block was the current focus of all the inserts. How do we address this issue Simple: we read the advice in the Oracle Performance Tuning Guide and Reference and (for older versions of Oracle particularly) realize that we should have created the table with multiple freelists. In this case, because we expect the typical degree of concurrency to be 5, we might go to exactly that limit, and create the table with the extra clause: storage (freelists 5) With this clause in place, Oracle maintains five linked lists of free blocks hanging from the table s segment header block, and when a process needs to insert a row, it uses its process ID to determine which list it should visit to find a free block. This means that (with just a little bit of luck) our five concurrent processes will never collide with each other; they will always be using five completely different table blocks to insert their rows.

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The complete cycle of activity relating to freelist management is outside the scope of this book, but the following points are reasonably accurate for the simplest cases: By default, a table is defined with just one segment freelist, and Oracle bumps the high water mark (HWM) by five blocks and adds those blocks to the freelist every time the freelist is emptied. Generally, it is only the top block on a freelist that is available for inserts in ordinary heap-organized tables. If you specify multiple freelists, Oracle allocates one more segment freelist than you expect and uses the first one as the master freelist. This master freelist is used as the focal point for ensuring that all the other freelists behave in a reasonable way and stay about the same length (which is somewhere between zero and five blocks). Historically, you could only set the freelists parameter when you created the table, but this changed somewhere in the 8i timeline (possibly in 8.1.6) so that you could modify the value used for future allocations with a simple, low-cost, alter table command.