The Java was syntactically and semantically correct — only it took over 6 hours to run, making the execs have to wait until after lunch for their updated data. My friend entreated me to spend 2 weeks trying to trim off some of the bottlenecks.
After 9 days, I had the program working in under 15 minutes could have been much shorter, but I was just cherry-picking. In one example, at the top of the main loop that ran about a million times, he instantiated a StringBuffer with the empty constructor he only needed a StringBuilder because there was no concurrency danger. It was a detailed statement, took Append calls and created a string of to bytes.
He was doing tens of millions of expensive operations with that one StringBuffer. I just created a PreparedStatement once and then bound the two variables in on each pass. First it translates the SQL into its internal language most of the work — but done only once , and then calls again to bind in any variables.
If you are not top-tier, it can be a bloody mess. Java, even bloated as it now is, is still a much less powerful toolbox with a limited set of ways to do things.
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