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Execution Plan (9.2.0.6 - autotrace) ---------------------------------------------------------SELECT STATEMENT Optimizer=ALL_ROWS (Cost=2149 Card=1 Bytes=9) SORT (AGGREGATE) TABLE ACCESS (BY INDEX ROWID) OF 'FACT_TABLE' (Cost=2149 Card=10000 Bytes=90000) BITMAP CONVERSION (TO ROWIDS) BITMAP INDEX (SINGLE VALUE) OF 'FCT_DIM_PAR' As you can see, Oracle has decided that this query will return 10,000 rows (card=10000). Taking the usual 80/20 split, this gives us 2,000 rows assumed to be widely scattered, and 8,000 rows tightly packed. The table in question consists of 1,000,000 rows and 30,303 blocks so 33 rows per blocks. The data therefore requires 2,000 + 8,000/33 = 2,242 block visits which is a little bit over the top for the cost of 2,149 that has been reported, especially when you add in roughly another 7 for the index block visits. However, it falls inside the range of values you can get by adjusting the db_file_multiblock_read_count, so I m not too worried by the difference. In case you re wondering, even in 9i the optimizer will calculate the cost of the two-table join before examining the cost of this single table access path.

Listing 5-7. Formatting Numeric Strings // string_numerical_formatting.cpp using namespace System; int main() { String^ str; int i = -73000; double dbl = 1005.01; // Formats for floating-point types: str = String::Format("Currency format: {0:c2}", dbl); Console::WriteLine(str); str = String::Format("Scientific format: {0:e6}", dbl); Console::WriteLine(str); str = String::Format("Fixed-point format: {0:f6}", dbl); Console::WriteLine(str); str = String::Format("General format: {0:g6}", dbl); Console::WriteLine(str); str = String::Format("Number format: {0:n6}", dbl); Console::WriteLine(str); str = String::Format("Percent format: {0:p6}", dbl); Console::WriteLine(str); str = String::Format("Round-trip format: {0:r6}", dbl); Console::WriteLine(str); // Formats for integral types: str = String::Format("Decimal format: {0:d6}", i); Console::WriteLine(str); str = String::Format("General format: {0:g6}", i); Console::WriteLine(str); str = String::Format("Number format: {0:n0}", i); Console::WriteLine(str); str = String::Format("Hexadecimal format: {0:x8}", i); Console::WriteLine(str); }

Select Set Ringtones/Alerts at the bottom of the list of profiles. Click Messages and then E-mail to see the screen shown. Notice that one of the fields is LED, and that when clicked, you can choose to disable the LED by selecting No.

The final note on the arithmetic of bitmap indexes covers the two transformations that can take place involving bitmaps. The basis of both transformations is something that we ve been looking at all through this chapter the frequently occurring execution plan line bitmap conversion (to rowids). A bitmap index is essentially a (cunningly packaged) two-dimensional array of ones and zeros. Each column in the array corresponds to one of the distinct values for the index key, each row in the array corresponds to a specific row location in the table. Oracle has a simple piece of arithmetic it can use to say, Row X in the array corresponds to the Nth row of the Mth block of the table; conversely, the Pth row of the Qth block in the table corresponds to row Z in the array. The arithmetic that translates an array entry into table entry is the bitmap conversion arithmetic and it can go either way, at any point in the execution plan. Normally, we only see it being used to convert from the array to the table, bitmap conversion (to rowids), at the very last moment before we acquire data from the table but there are other options. One of these options is quite well known, and actually caused a few problems in the upgrade from 8i to 9i: the B-tree to bitmap conversion, reported in a plan as bitmap conversion (from rowids). For example: select small_vc from t1 where and ; n1 = 33 n2 = 21

1. 2. 3. 4. From your Home screen, click the Options icon, scroll to Bluetooth, and click. Press the Menu key and select Options. Go down to LED Connection Indicator and set it to On or Off. Press the Menu key and save your settings.

Execution Plan (9206) ---------------------------------------------------------SELECT STATEMENT Optimizer=ALL_ROWS (Cost=206 Card=400 Bytes=6800) TABLE ACCESS (BY INDEX ROWID) OF 'T1' (Cost=206 Card=400 Bytes=6800) BITMAP CONVERSION (TO ROWIDS) BITMAP AND BITMAP CONVERSION (FROM ROWIDS) INDEX (RANGE SCAN) OF 'T1_I1' (NON-UNIQUE) (Cost=41) BITMAP CONVERSION (FROM ROWIDS) INDEX (RANGE SCAN) OF 'T1_I2' (NON-UNIQUE) (Cost=41) In this example (see script bitmap_cost_07sql in the online code suite), we have two B-tree indexes on the table t1 The optimizer has decided that neither of the two B-tree indexes (t1_i1 on column n1, and t1_i2 on column n2) is very efficient as the single access path to the table, but it has calculated that the number of rows identified by combining the two predicates will be small.

Here is the output of Listing 5-7: Currency format: $1,005.01 Scientific format: 1.005010e+003 Fixed-point format: 1005.010000 General format: 1005.01 Number format: 1,005.010000 Percent format: 100,501.000000 % Round-trip format: 1005.01 Decimal format: -073000 General format: -73000 Number format: -73,000 Hexadecimal format: fffee2d8

Go into your Options icon and scroll to Screen/Keyboard (or press the letter S to jump there) and click. Scroll down to the LED Coverage Indicator field and select either On or Off.