10.15.8 The optimizer_trace System Variable

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MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4

10.15.8 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.