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Excellent write up, and I recognize your stating right up front that this isn’t meant to be a proper benchmark. The one particular missing component, in my opinion, is that you will be loading right into a desk with no secondary indexes.
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Just the partitions (or subpartitions) shown are checked for matches, in addition to a row that isn't in any of these partitions or subpartitions is just not up to date, no matter whether it satisfies the where_condition
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UPDATE returns the volume of rows that were in fact adjusted. The mysql_info() C API operate returns the number of rows that were matched and current and the amount of warnings that occurred during the UPDATE.
Change values in between two and more columns. In end result, ufter update, columns will have values from right after columns
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I don’t have an answer re: doublewrite buffer, but I do realize that Other individuals have verified related. One particular modify Facebook manufactured within their department was to put in writing only spaceid/webpage quantity to the doublewrite buffer, that makes a lot of perception for them with semi-sync replication. It might be interesting To guage how official source this improvements overall performance properties.