Observe that "atomic" is contextual: In such cases, the upsert operation only must be atomic with regard to functions to the solutions table during the database; the computer may be cost-free to perform other things providing they don't influence (or are affected by) the result of what upsert is attempting to try and do.
The definition of atomic is hazy; a worth that may be atomic in one application can be non-atomic in A further. For your basic guideline, a price is non-atomic if the application deals with merely a Portion of the worth.
If the locked entry just isn't certain to one cache line things get a lot more intricate. There are an array of awful corner instances, like locked accesses over web site boundaries, etcetera. Intel won't explain to particulars they usually in all probability use all types of tricks to help make locks more rapidly.
I discovered a pretty well put clarification of atomic and non-atomic Houses here. Here's some pertinent textual content within the exact same:
atomic idea, historic philosophical speculation that each one factors might be accounted for by innumerable combinations of hard, small, indivisible particles (termed atoms) of assorted measurements but of precisely the same simple materials; or the trendy scientific principle of issue In accordance with which the chemical components that Incorporate to sort The good number of substances consist them selves of aggregations of comparable subunits (atoms) possessing nuclear and electron substructure characteristic of every component. The traditional atomic concept was proposed in the fifth century bce through the Greek philosophers Leucippus and Democritus and was revived in the 1st century bce via the Roman philosopher and poet Lucretius.
All atomic bomb atomic mass device atomic mass Atomic Wallet atomic range atomic clock atomic celebration atomic nucleus See all meanings Phrase from the Day
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Slur directed at LGBTQ colleague in the course of company holiday getaway celebration - should really I have claimed anything at all more being a supervisor and fellow colleague?
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A lot of the atom is empty space. The remainder contains 3 simple varieties of subatomic particles: protons, neutrons, and electrons. The protons and neutrons type the atom’s central nucleus. (The ordinary hydrogen atom is an exception; it incorporates a person proton but no neutrons.) As their names advise, protons Have a very optimistic electrical charge, though neutrons are electrically neutral—they carry no charge; Over-all, then, the nucleus incorporates a optimistic demand.