Oracle Database 10g High Availability with RAC, Flashback, by Matthew Hart

By Matthew Hart

Unlocks the key to conserving your Database on hand and working smooth.
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Extra resources for Oracle Database 10g High Availability with RAC, Flashback, and Data Guard (Osborne ORACLE Press Series)

Example text

1. The concept of bind variable peeking is simple. During the physical optimization phase, the query optimizer peeks at the values of bind variables and uses them as literals. The problem with this approach is that the generated execution plan depends on the values provided by the first execution. sql, illustrates this behavior. Note that the first optimization is performed with the value 990. Consequently, the query optimizer chooses a full table scan. It is this choice, since the cursor is shared (the sql_id and the child number are the same), that impacts the second query that uses 10 for the selection.

For the moment, just think that this is the way things generally work. fm Page 16 Wednesday, March 26, 2008 3:56 PM 16 CHAPTER 2 ■ KE Y CONCEPTS Open cursor Parse cursor Cursor returns data? Yes Define output variables No Cursor uses bind variables? Yes Bind input variables No Execute cursor Cursor returns data? Yes Fetch cursor No More data? No Close cursor Figure 2-1. fm Page 17 Wednesday, March 26, 2008 3:56 PM CHAPTER 2 ■ KEY CONCEPTS Depending on the programming environment or techniques you are using, the different steps depicted in Figure 2-1 may be implicitly or explicitly executed.

Its parsed representation that includes the execution plan (which describes how the SQL engine will execute the SQL statement) is loaded in the shared pool, specifically, in the library cache. The structure in the UGA is updated to store a pointer to the location of the shareable cursor in the library cache. The next section will describe parsing in more detail. Define output variables: If the SQL statement returns data, the variables receiving it must be defined. This is necessary not only for queries but also for DELETE, INSERT, and UPDATE statements that use the RETURNING clause.

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