7.4 Performance Tuning
When tuning objects, the following items need to be addressed:
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                     How objects and object views consume CPU and memory resources during runtime 
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                     How to monitor memory and CPU resources during runtime 
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                     How to manage large numbers of objects 
Some of the key performance factors are the following:
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                     DBMS_STATSpackage to collect statistics
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                     tkprofto profile execution of SQL commands
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                     EXPLAINPLANto generate the query plansSee Also: Oracle Database SQL Tuning Guide for details on measuring and tuning the performance of your application