Multi-threading can be accomplished at many levels

- Separate stages that run parallel to each other, in Concurrent Manager request sets
- Using DBMS_JOB.SUBMIT at the database level
- Compiled Pro*C files (Oracle does this with PYUGEN for example)
- Unix background processes
- Scripting language such as Perl
- Java
- JSP
- etc

However, in the wise words of someone else I know, sometimes the simpliest answer achieves the desired goal. Shell Scripts, when you get down to it, are pretty simple. No real complex logic in most cases.

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