System Variables: Add log_bin and change the default of performance_schema
#2488
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The
log_binsystem variable controls whether a MySQL server logs to the binary log or not.The
performance_schemasystem variable was previously defaulted to1, to match MySQL's default, but this can cause tools (e.g. Datadog) to believe that theperformance_schemasystem tables are available, and then error out when trying to query them. Since we don't provide aperformance_schemadatabase, the new default for theperformance_schemasystem variable is0.