We assume that you already have Oracle databse 10g Express Edition installed in your machine.
For SOA to be installed on your machine, you will have to make the following changes to default configuration of Oracle XE Database.
Maximum System Global Area (SGA) Size of the Database should be more than 150M.
Follow these steps to check/increase SGA.
1. Go to Database Home Page url : http://localhost:8080/apex
2. Login into XE Home page with your username(system privilege) and password
3. Navigate to Home -> Administration -> Memory -> Manage SGA
4. Set a SGA Target (in MB), with a value of more then 150.
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