By Thomas Kyte
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Additional info for Expert Oracle Database Architecture: 9i and 10g Programming Techniques and Solutions
Qxd 12 8/22/05 2:56 PM Page 12 CHAPTER 1 ■ DEVELOPING SUCCESSFUL ORACLE APPLICATIONS If you use bind variables, then everyone who submits the same exact query that references the same object will use the compiled plan from the pool. You will compile your subroutine once and use it over and over again. This is very efficient and is the way the database intends you to work. Not only will you use fewer resources (a soft parse is much less resource intensive), but also you will hold latches for less time and need them less frequently.
The table or index name). • P_OWNER: Defaults to the current user, but you can use this routine to look at some other schema. qxd xxxviii 8/22/05 4:35 PM Page xxxviii ■SETTING UP YOUR ENVIRONMENT • P_TYPE: Defaults to TABLE and represents the type of object you are looking at. For example, SELECT DISTINCT SEGMENT_TYPE FROM DBA_SEGMENTS lists valid segment types. • P_PARTITION: Name of the partition when you show the space for a partitioned object. SHOW_SPACE shows space for only one partition at a time.
125,829,120 Total MBytes............................ 120 Unused Blocks........................... 728 Unused Bytes............................ 5,963,776 Last Used Ext FileId.................... 4 Last Used Ext BlockId................... 43,145 Last Used Block......................... 296 PL/SQL procedure successfully completed. The items reported are as follows: • Unformatted Blocks: The number of blocks that are allocated to the table and are below the high-water mark (HWM), but have not been used.