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Extra resources for ACTUALTESTS Oracle 1Z0-033 Exam Q and A 05 30 05
This eliminates table access: The access path is index only. Of these three stars, the third is often the most important one. Leaving a column out of an index may lead to many slow random reads from the disk drive. An index that has at least the third star is a fat index for the given SELECT. A Fat Index A fat index is an index that has at least the third star. It contains all the table columns referred to by the SELECT and so enables index only access. In simple cases, like CURSOR41, the structure of a three-star index is quite straightforward.
Strictly speaking, however, this usage is incorrect. A more accurate term would be conditional expression or truth-valued expression. (page 79) OPTIMIZERS AND ACCESS PATHS One of the long-standing advantages of relational databases has been that data is requested with little or no thought for the way in which the data is to be accessed. This decision is made by a component of the DBMS called the optimizer. These have varied widely across different relational systems and probably always will, but they all try to access the data in the most effective way possible, using statistics stored by the system collected on the data.
These statistics are usually gathered on request, for example, by running a special program called RUNSTATS in DB2 for z/OS. The default statistics gathered normally include basic information, such as the number of table rows and pages per table, the number of leaf pages, the cluster ratio per index, and the number of distinct values for some columns or column combinations (termed cardinality) as well as the highest and lowest values (or the second highest and the second lowest) for some columns.