Archive for the 'performance tuning'

Xplan 2.0

A lot of new features have been added in version 2.0 of xplan, the sqlplus script I use to investigate about SQL statements performance (I spoke about version 1.0 in this post). Here’s a brief description. wait profile (from ASH) For each statement, its wait profile is calculated fetching...
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Tuning Oracle for Siebel – SQL template

The time has come to write down some of the most relevant discoveries I’ve made so far while being part of a team that is tuning a huge Siebel installation for a leading Italian company (“huge” especially because of the user base dimension and secondarily because of the hardware...
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Optimizing SQL statements with xplan

Xplan is a utility to simplify and automate the first part of every SQL statement tuning effort, that is, collecting the real plan of the statement, its execution statistics (number of executions, number of buffer gets performed, etc), getting the definition of all the accessed tables (and their...
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