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The first one enables collection of cache statistics, the second one enables the use of cache statistics for optimization and since it can be set at the session level, it can t really hurt to try fiddling with it (on a test database). set autotrace traceonly explain alter session set "_optimizer_cache_stats" = true; select count(*) from t1; alter session set "_optimizer_cache_stats" = false; select count(*) from t1; set autotrace off In this particular test, the cost of the tablescan with _optimizer_cache_stats set to false was 5,030 (this was following on from the 2KB block test earlier). When I switched _optimizer_cache_stats to true, the cost dropped to 5,025. Unfortunately, I couldn t see any SQL accessing cache_stats_1$ during the optimization phase when I enabled cache stats. On the other hand, the optimizer always accessed the empty tab_stats$ and ind_stats$ tables to optimize a new statement. I m still in the dark about what this scattered collection of observations means but there seem to be at least two groups in Oracle Corporation who are working on ideas about including localized cache hit ratios into the optimizer. If or when the feature goes into production, it s sure to fix some existing problems; it s also likely to create some new ones. How, for example, do you work out what the execution plan was 24 hours after a performance problem has come and gone, when the localized cache hit ratios have changed or you re only allowed to run diagnostics on the UAT system where the localized cache hit ratios have nothing to do with the figures you get from production (You may have to license the AWR whether you like it or not.)

Press the Menu key and select Options. (Shortcut: pressing the letter key that matches the first letter of the menu item (e.g., the O key) a couple of times will jump you down to that item.) In the Options screen, you will see the Importance field. Select from Normal and you will see the options High or Low. Press the Menu key and save.

Parallel query (or parallel execution as it became in 8i) is another feature of the Oracle database where a seemingly small change in the costing strategy produces a dramatic change in the cost calculations. The best place to see this is in our nice simple tablescan; and the change for this simple operation is so dramatic that you won t have any trouble believing how much difference it could make to a more complex query. Re-create the table from our first test, and run the following queries against it with autotrace enabled. Repeat the following queries in 8i, 9i, and 10g, first with system statistics disabled (script parallel.sql in the online code suite) and then using the system statistics defined earlier in the chapter (see script parallel_2.sql in the online code suite): select select select select select select select select /*+ /*+ /*+ /*+ /*+ /*+ /*+ /*+ parallel(t1,1) parallel(t1,2) parallel(t1,3) parallel(t1,4) parallel(t1,5) parallel(t1,6) parallel(t1,7) parallel(t1,8) */ */ */ */ */ */ */ */ count(*) count(*) count(*) count(*) count(*) count(*) count(*) count(*) from from from from from from from from t1; t1; t1; t1; t1; t1; t1; t1;

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if (board[i, j] == nullptr) { Console::BackgroundColor = spaceTypeColors[spaces[i, j]]; Console::Write(" "); // The foreground and background colors are restored to // the colors that existed when the current process began. Console::ResetColor(); } else { Console::BackgroundColor = ConsoleColor::Black; Console::ForegroundColor = ConsoleColor::White; Letter letter = board[i, j]->LetterValue; if (letter == Letter::_) { Console::Write(" {0:1} ", board[i,j]->BlankValue); } else { Console::Write(" {0:1} ", board[i, j]); } Console::ResetColor(); } } Console::WriteLine(); } Console::WriteLine(); } // Draw a tile from the bag and return it. // Returns null if the bag is empty. // The parameter keep is true if the tile is drawn during the game, // false if the tile is drawn at the beginning of the game // to see who goes first. Tile^ DrawTile(bool keep) { if (bag->Count == 0) // Return nullptr if there are no tiles left. { return nullptr; } int random_index = safe_cast<int>((random->NextDouble() * bag->Count) ); Tile^ tile = bag[random_index]; if (keep) bag->RemoveAt(random_index); return tile; }

Assuming you have parameter parallel_max_servers set to at least 8, you should get results similar to those in Table 2-5 for the cost of the query.

On some, but not all e-mail messages you send, you will see a little D inside the checkmark. These are messages that have been confirmed delivered to the recipient. It does not mean they have opened the message just that it was successfully delivered to their inbox. Notice the D next to the two check marks in Figure 12-4.

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Please see page 22 to learn how to enable spell checking on e-mail messages you type and send. The spelling checker may not be turned on when you take your BlackBerry out of the box the first time.