MySQL :: MySQL 9.6 Reference Manual :: 10.15.8 The optimizer

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MySQL 9.6 Reference Manual / ... / The optimizer_trace System Variable

The optimizer_trace system variable has these on/off switches:

enabled: Enables (ON) or disables (OFF) tracing
one_line: If set to ON, the trace contains no whitespace, thus conserving space. This renders the trace difficult to read for humans, still usable by JSON parsers, since they ignore whitespace.

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