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When we introduce the distinct operator, the optimizer estimates the number of rows that will be produced by each of the two halves of the query using the normal Group by Cardinality calculations, which results in lower costs and lower final cardinality (The difference in costs disappears in this example if you enable CPU costing but that s just the normal oddity of how costing for in-memory sorts can change as you enable CPU costing).

While the BlackBerry is still on, do a battery pull that is, take off the back of the casing, remove the battery, wait 30 seconds, and then re-install it. Once the BlackBerry reboots, you should be all set for SMS Text and MMS messaging.

Contrary to the received wisdom on set operations, it seems that the practice of omitting the distinct operator is actually a bad idea the optimizer does a better job of estimating the cardinality of the base result set if you include the distinct. It shouldn t matter, but at present it does.

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property List<Isotope>^ Isotopes; property List<double>^ IsotopeAbundance; property double AtomicWeight { virtual double get() override { // Check to see if atomic weight has been calculated yet. if (atomicWeight == 0.0) { double total = 0.0; if (Isotopes->Count == 0) return 0.0; for (int i = 0; i < Isotopes->Count; i++) { total += Isotopes[i].Mass * IsotopeAbundance[i]; } atomicWeight = total /* / Isotopes->Count */ ; } return atomicWeight; } }

When it comes to the cardinality of the result from the set operator itself, we are back on familiar territory. Running the tests under 10g, I got the following sets of figures shown in Table 13-8. As you can see, once the optimizer has worked out the cardinalities of the base queries, it uses a worst-case scenario to work out the results of the set operation.

20 15 35 15 20

You already know that your BlackBerry is an amazing messaging device. What you may not realize is that there are so many more ways to use messaging on the BlackBerry. In this chapter, we will look at PIN messaging (using the unique identifying PIN for each BlackBerry), BlackBerry messaging (BBM), as well as voice notes and other forms of instant messaging.

owner (4) * object_type (7) / 1.4142 owner (3) * object_type (7) / 1.4142 t1 value + t2 value least (t1 value, t2 value) First (i.e., t1) value

public:

BlackBerry handhelds have a unique feature called PIN-to-PIN, also known as PIN Messaging or Peer-to-Peer Messaging. This allows one BlackBerry user to communicate directly with another BlackBerry user as long as you know that user s BlackBerry PIN. We ll show you an easy way to find your PIN and send it in an e-mail to your colleague.

You have to be a little careful with the assumptions you make about how the SQL will be operated It is possible for things to change, and it may well have been true that in 80 or 73 the presence of the apparently redundant distinct would have resulted in an extra pair of sorts taking place Things do change, and bugs can appear If you look in the 10053 trace, by the way, you won t find any information about the set operation itself there will be a section for each of the two separate queries, followed by a final cost that represents the set operation But there is no explanation or justification for the final figures So you can only assume, as I do, that the optimizer just adds the cost of the separate queries to get the final cost of the set operation.

1. Compose an e-mail to your colleague. In the body of the e-mail, type something like This is my BlackBerry PIN number Type the code letters mypin.

Consider, as a final warning then, the following CTAS (which also appears in script set_opssql in the online code suite): create table t_intersect as select distinct * from ( select owner, object_type from t1 intersect select owner, object_type from t2 ) ; Clearly, the distinct in the outer select statement is redundant but we have already seen that Oracle is very good at avoiding sorts that are not really needed (not just in set operations, but also in our earlier example that featured a group by followed by an order by) So what s the execution plan for the CTAS Here s the output from dbms_xplan in 920.