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Displaying posts with tag: optimizer_trace (reset)

Optimizer tracing: how to configure it
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posted by Guilhem Bichot on Tue 04 Oct 2011 13:40 UTC
Tags:
(edit) mysql, explain, new feature, range, MySQL 5.6, optimizer trace, optimizer_trace, optimizer_trace_max_mem_size, optimizer_trace_features
In this blog post, my colleague Jørgen Løland described a new feature of MySQL 5.6: Optimizer Tracing. I recommend reading his article, as it presents this new feature in a simple, easy-to-read manner.

The Optimizer Tracing feature can help understanding what the Optimizer is doing; it is available since milestone 5.6.3, announced October 3rd at Oracle Open World (here is the changelog). It's good to see it mature now; I remember that Sergey Petrunia did the first prototype back in March 2009!

Today  I will be giving some must-have tips related to handling big traces.

First thing to know, a trace lives in main memory (internally it is allocated on





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