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MySQL 5.7 Reference Manual  /  ...  /  The optimizer_trace System Variable

8.15.8 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.


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Related Documentation
MySQL 5.7 Release Notes
Download this Manual
PDF (US Ltr) - 35.1Mb
PDF (A4) - 35.2Mb
Man Pages (TGZ) - 255.8Kb
Man Pages (Zip) - 360.7Kb
Info (Gzip) - 3.4Mb
Info (Zip) - 3.4Mb
Excerpts from this Manual
MySQL Backup and Recovery
MySQL Globalization
MySQL Information Schema
MySQL Installation Guide
MySQL and Linux/Unix
MySQL and macOS
MySQL Partitioning
MySQL Performance Schema
MySQL Replication
Using the MySQL Yum Repository
MySQL Restrictions and Limitations
Security in MySQL
MySQL and Solaris
Building MySQL from Source
Starting and Stopping MySQL
MySQL Tutorial
MySQL and Windows
MySQL NDB Cluster 7.5