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We re going to do a two-column join with a filter on the two tables Note that the filter columns have identical definitions (although the data content is randomized) More significantly, though, one of the join columns is dramatically different from its counterpart Column t1join1 holds only 30 distinct values ranging from 0 to 29, column t2join1 holds a nominal 4,000 distinct values ranging from 0 to 3,999 (In fact, there were 3,668 distinct values in this column because of the effects of the random data generation) After creating the data, we run two queries the following SQL encapsulates both of them; the second query can be constructed by switching the comment marker from one filter predicate to the other select t1v1, t2v1 from t1, t2 where t2join1 = t1join1 and t2join2 = t1join2 and t1.

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filter = 10 -- and t2filter = 10 ; Since the two filter columns are identical, to within a little random scattering, you might think that the optimizer would produce the same cardinality whichever filter column is used to identify 1% of the joined data There is a bit of flaw in that argument in extreme cases, and Oracle seems to make some attempts to address it These are the execution plans Execution Plan (9206, autotrace Filter on t1) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=CHOOSE (Cost=57 Card=7 Bytes=266) 1 0 HASH JOIN (Cost=57 Card=7 Bytes=266) 2 1 TABLE ACCESS (FULL) OF 'T1' (Cost=28 Card=100 Bytes=2000) 3 1 TABLE ACCESS (FULL) OF 'T2' (Cost=28 Card=10000 Bytes=180000) Execution Plan (9206, autotrace.

After you have entered or synced your names and addresses to your BlackBerry, you may send e-mail messages directly from your contacts. (See page 67 for help on sync setup for Windows PC users, or page 125 for Apple Mac users.) 1. Navigate to your Contacts icon (address book) and click the trackpad.

The former is a deep copy since we re creating a version we can modify The latter is a shallow copy The reference is changed to point to the modified object It s useful to examine this code see the treatment of the variable workingTiles and workingBoard in the PlayerMove function Another thing to notice about the arrays is that the array of tiles on the board is an array of handles You ll see that it starts off as an array of null handles, and as tiles are played, the handles are set to actual objects..

Filter on t2) ---------------------------------------------------------0 SELECT STATEMENT Optimizer=CHOOSE (Cost=57 Card=500 Bytes=19000) 1 0 HASH JOIN (Cost=57 Card=500 Bytes=19000) 2 1 TABLE ACCESS (FULL) OF 'T2' (Cost=28 Card=100 Bytes=2100) 3 1 TABLE ACCESS (FULL) OF 'T1' (Cost=28 Card=10000 Bytes=170000) Why are the computed cardinalities so amazingly different According to the formulae: Join Selectivity = {join1 bit} * {join2 bit} = 1 / greater (30, 3,668) * 1 / greater (20, 50) = 000000545256.

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Join Cardinality = 000000545256 * 10000 * 100 = 54526 So why has the optimizer worked out a selectivity (which we can see in the 10053 trace) of exactly 50000e-004 when we apply the filter to table t2 (3,668 distinct values), and a selectivity of 71744e-006 when we apply the filter to table t1 (30 distinct values) As you saw previously, one of the complications appears because both our test statements have a filter predicate on just one side of the join so the standard formula is modified to use the num_distinct values from the other side of the join But then if you vary the test by generating column t1join1 as dbms_randomvalue(0,30) + 1, the computed cardinality of one test changes; and again, if you change the test to generate column t1join1 as 50 * dbms_random.

A new feature with BlackBerry 5.0 system software and BlackBerry Internet Service software (assuming your carrier has upgraded) is that you now can select wireless contact syncing for Google. To do so, follow these steps: CAUTION: You can also sync your Google Contacts using the Google Sync app (see page 311). Do not sync Google Contacts with both methods you are asking for trouble. Instead, if you choose to use this method below for Contacts syncing, use Google Sync for only your Google Calendar.