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From Sankar Reddy <masank...@yahoo.co.in>
Subject IBATIS issue while using Oracle stored proc returning output cursor with null column
Date Mon, 31 Aug 2009 15:57:24 GMT


We are seeing a weird (potential) memory issue while using IBATIS for JAVA.
We call an Oracle 10g stored proc via IBatis. The proc returns a single
cursor with 10 columns.
Out of the 10 columns, 3 column has been hardcoded to NULL (for business
functionality reasons) in the SELET Statement of the CURSOR. 

When we set a column explicitly NULL we see that IBATIS seems to take a huge
amount of memory and this leads to FULL GCs – which block our application –
hence degrading its performance.
But, if we set the column to a hardcoded string value (say ‘xyz’), we don’t
see this high memory usage and hence no FULL GCs and hence does not degrade
our performance.

To give an idea, when the sproc is with explicit NULL, the java service that
calls this proc (via ibatis) takes 10 seconds (on a 60 concurrent user
load). This 10 seconds is because of multiple FULL GCs.
But, when we change to a hardcoded string ‘xyz’, we see the same service
return in less 500 ms (for the same load)

Is this a bug or are we configuring ibatis the incorrect way? Any help is
much appreciated.

Please note, we are a Spring 3.0 based java web app, running on Weblogic 9.2
MP3.We are using IBATIS for JAVA version 2.3.0

We have checked and ensured that our JVM settings are appropriate (around
712MB) and the amount of data returned is very little ( 2 records per call,
each with 10 string columns).

Say for example:
First_name as FIRSTNAME,
Last_name as LASTNAME,
            NULL as DESIGNATION

Now the resultMap would look like this:
<resultMap id="getEmployees" class="employeesDTO" >
                                    <result property="firstName"
column="FIRSTNAME" />
                                    <result property="lastName"
column="LASTNAME" />                              
                                    <result property="desig"
column="DESIGNATION" />

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