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https://dev.mysql.com/doc/refman/8.0/en/mysql-shell-tutorial-python-download.html
As part of this quick-start guide, an example schema is provided which is referred to as the world_x schema. Many of the examples demonstrate Document Store functionality using this schema. Start your MySQL server so that you can load the world_x ...
https://dev.mysql.com/doc/refman/8.0/en/operator-precedence.html
Section 15.7.6.1, “SET Syntax for Variable Assignment”, and Section 11.4, “User-Defined Variables”, explain how MySQL determines which interpretation of = should apply. Operator precedences are shown in the following list, from highest ...
https://dev.mysql.com/doc/refman/8.0/en/optimization.html
This chapter explains how to optimize MySQL performance and provides examples. Depending on your job role (developer, DBA, or a combination of both), you might optimize at the level of individual SQL statements, entire applications, a single ...
https://dev.mysql.com/doc/refman/8.0/en/optimizer-features-to-trace.html
Range optimizer Dynamic range optimization: Shown as range checked for each record in EXPLAIN output; each outer row causes a re-run of the range optimizer. Some features in the optimizer can be invoked many times during statement optimization and ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-transaction-management.html
To get rid of a runaway rollback once it occurs, increase the buffer pool so that the rollback becomes CPU-bound and runs fast, or kill the server and restart with innodb_force_recovery=3, as explained in Section 17.18.2, “InnoDB Recovery”. To ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb.html
This section explains how to optimize database operations for InnoDB tables. InnoDB is the storage engine that MySQL customers typically use in production databases where reliability and concurrency are important.
https://dev.mysql.com/doc/refman/8.0/en/partitioning-pruning.html
An INSERT statement also accesses only one partition per inserted row; this is true even for a table that is partitioned by HASH or KEY although this is not currently shown in the output of EXPLAIN. The optimization known as partition pruning is ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-range.html
For example, when executing a query such as EXPLAIN SELECT COUNT(*) FROM employees WHERE separated BETWEEN '2000-01-01' AND '2000-12-31' GROUP BY store_id;, MySQL can quickly determine that only partition p2 needs to be scanned because the remaining ... A table that is partitioned by range is partitioned in such a way that each partition contains rows for which the partitioning expression value lies within a given ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-summary-tables.html
One use for this might be to run EXPLAIN on the statement to examine the execution plan for a representative statement associated with a frequently occurring digest. The Performance Schema maintains tables for collecting current and recent ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema.html
For example, it does not cause thread scheduling to change, and it does not cause query execution plans (as shown by EXPLAIN) to change. The MySQL Performance Schema is a feature for monitoring MySQL Server execution at a low level. The Performance ...