Number of SQL Version in AWR and child cursor
HelloIn 11.1.0.7, which is Version SQL count in AWR report? What it means? and how oracle performs this version? How do we define child cursor?
Thank you
Hello
Take a look at http://viveklsharma.wordpress.com/2009/09/12/ql/
Concerning
Anand
Tags: Database
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Lets say that 2 LMD were fired with the same set of variables bind (names of variables were same but differed from the value.) The only difference between the 2 LMD was the value of the variable binding) and under the same conditions of load.
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VishalI'm not sure how useful jumping in stuff like bunch 0 and 6 bunch is in terms of understanding what is a parent and what is a child cursor.
This quote seems to come from Steve Adams - http://www.ixora.com.au/q+a/0104/19005414.htm
It's a good idea to cite your references.I'll give it a go.
A cursor is a lot of information stored in memory on a SQL statement.
The basic information for a parent cursor is the text of the SQL statement - exact matches of the statement can only share the parent cursor.
The cursor of the child is really on the implementation plan specific for a statement and the different settings and parameters that caused this plan to be generated.
There are a whole bunch of reasons why the executions of the same SQL statement may or may not reuse the existing child cursors.
In your example 2 statements that differ by the variable binding are likely to lead to different children, although there are factors that can lead to lie different values, do not share the same children among whom for example, the length of the dregs, Adaptive setting cursor_sharing = similar and histograms, or new features like cursor sharing (on subsequent runs of renowned sql running suboptimal initially).
It might be useful to see V$ SQL_SHARED_CURSOR. This shows the disparities that cause children to not be shared. There are more than 60 columns in this view which gives an indication of the number of factors that can influence.
http://download.Oracle.com/docs/CD/E11882_01/server.112/e17110/dynviews_3059.htm#REFRN30254You might want to look here the criteria for sharing SQL:
http://download.Oracle.com/docs/CD/E11882_01/server.112/e16638/memory.htm#i40017Away from the main documentation, perhaps some of the writings of the optimizer Development Group could help?
http://blogs.Oracle.com/mt/mt-search.cgi?blog_id=3361&tag=cursor%20sharing&limit=20Christian Antognini described this area very well in the "Oracle Performance Troubleshooting Guide".
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HTH
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