Your assumption about people with no legal problems being the exclusive persons to serve on a jury is wrong. No convicted felons that have not had their civil rights restored.
Next - it will show up on your record as an arrest not a conviction. Most employers or anyone for that matter cannot see your arrests. If your job requires a special license or you work for the government or a government sub-contractor - then your arrest will show up.
You can "seal" your record if you can show that you are factually innocent of the charges which you were arrested. The burden of proof is on you to prove that.
The above information does not establish an attorney client relationship nor is it meant to provide legal advice.
It depends on what you call a record. When filling out an employment application you can answer no, I have not been convicted.
However, if an employer checks a system like livescan or is entitled to the Californina DOJ records, the arrest will show up. It is becoming more and more common.
If you want to call me at 619-233-6900 and give me the scenerio you are most worried about, we can talk about it.
This information is given for legal education only. It may not work for your specific situation. It is not legal advice, and I am not your lawyer. You have to find your own local lawyer to get legal advice and help with your problem.
There would be no public record of your arrest. However, there might be a court file reveiwable by the public if a case was filed, even though it was later dismissed. Nevertheless, since there was no conviction there is no criminal record. As for jury duty, an arrest doesn't disqualify you from sitting on a jury. If you can demonstrate that you're actually innocent of the charge, you may be able to have the police record of your arreest destroyed, but that's highly unlikely given the facts you listed in your question.