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Basic MySQL Optimizer Tracing for Data Performance - Distribute…
https://distributeddba.com/blog/database-administration/data-performance/basic-mysql-optimizer-tracing/#:~:text=Tracing%20MySQL%E2%80%99s%20optimizer%20To%20trace%20the%20MySQL%20optimizer%2C,you%20run%20the%20query%20you%20want%20to%20trace.
MySQL: The Optimizer Trace
https://dev.mysql.com/doc/dev/mysql-server/latest/PAGE_OPT_TRACE.html
MySQL :: MySQL Internals Manual :: 8 Tracing the Optimizer
https://dev.mysql.com/doc/internals/en/optimizer-tracing.html
In MySQL 5.6, a new tracing capability was added to the MySQL optimizer. The interface is provided by a set of optimizer_trace_xxx system variables and the INFORMATION_SCHEMA.OPTIMIZER_TRACE table, but is subject to change.
MySQL Optimizer Trace | Whats & Hows
https://bobcares.com/blog/mysql-optimizer-trace/
MySQL comes with a new tracing feature in the MySQL optimizer. The interface has a set of optimizer_trace_xxx system variables as well as INFORMATION_SCHEMA.OPTIMIZER_TRACE table in order to produce output understood by users as well as programs. Furthermore, it demystifies the MySQL Optimizer’s actions and …
Basic MySQL Optimizer Tracing for Data Performance
https://distributeddba.com/blog/database-administration/data-performance/basic-mysql-optimizer-tracing/
Tracing MySQL’s optimizer. To trace the MySQL optimizer, you have to turn it on for your session. This is achieved by setting optimizer_trace="enabled=on". Enable MySQL optimizer tracing. Be warned though, the output can be long. Then you run the query you want to trace. You can retrieve the results of the trace from the INFORMATION_SCHEMA.OPTIMIZER_TRACE table. Tracing a …
8.12 Selecting Optimizer Features to Trace - MySQL
https://dev.mysql.com/doc/internals/en/optimizer-features-to-trace.html
MySQL Internals Manual / Tracing the Optimizer / Selecting Optimizer Features to Trace 8.12 Selecting Optimizer Features to Trace Some features in the optimizer can be invoked many times during statement optimization and execution, and thus …
MySQL: The Optimizer Trace
https://dev.mysql.com/doc/dev/mysql-server/8.0.20/PAGE_OPT_TRACE.html
The effect of this SET is the following: all remembered traces are cleared. a later SELECT on OPTIMIZER_TRACE returns the first LIMIT traces of the OFFSET oldest remembered traces (if OFFSET >= 0), or the first LIMIT traces of the -OFFSET newest remembered traces (if OFFSET < 0). For example, a combination of OFFSET=-1 and LIMIT=1 will make the ...
MySQL :: MySQL Internals Manual :: 8.1 Typical Usage
https://dev.mysql.com/doc/internals/en/optimizer-tracing-typical-usage.html
Press CTRL+C to copy. # Turn tracing on (it's off by default): SET optimizer_trace="enabled=on"; SELECT ...; # your query here SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; # possibly more queries... # When done with tracing, disable it: SET optimizer_trace="enabled=off"; A session can trace only statements which it executes; it cannot see a trace of another session.
Is there any way to trace optimizer's work in MySQL?
https://dba.stackexchange.com/questions/42602/is-there-any-way-to-trace-optimizers-work-in-mysql
Tracing the Optimizer. # Turn tracing on (it's off by default): SET optimizer_trace="enabled=on"; SELECT ...; # your query here SELECT * FROM INFORMATION_SCHEMA.OPTIMIZER_TRACE; # possibly more queries... # When done with tracing, disable it: SET optimizer_trace="enabled=off"; You can see it in action in SQL-Fiddle.
Optimizer Trace — The Unofficial MySQL 8.0 Optimizer Guide …
http://www.unofficialmysqlguide.com/optimizer-trace.html
OPTIMIZER_TRACE provides answers to these questions. It was designed to provide more diagnostic data on the optimizer, but it can be useful for practical troubleshooting as well as learning how the optimizer cost model works. Example 2: EXPLAIN shows a …
8.10 The optimizer_trace System Variable - MySQL
https://dev.mysql.com/doc/internals/en/optimizer-trace-system-variable.html
8.10 The optimizer_trace System Variable. The optimizer_trace system variable has these on/off switches: enabled: allows to enable/disable tracing. one_line: if on, the trace will have no whitespace; it's unreadable for humans but readable for JSON parsers (they ignore whitespace); the only advantage is a saving on space. PREV HOME UP NEXT.
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