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https://dev.mysql.com/doc/refman/8.0/en/mysqlshow.html
--count Command-Line Format --count Show the number of rows per table. The permitted levels are from 1 to 22, with larger values indicating increasing levels of compression. The mysqlshow client can be used to quickly see which databases exist, ...
https://dev.mysql.com/doc/refman/8.0/en/non-typed-operators.html
->> Return value from JSON column after evaluating path and unquoting the result; equivalent to JSON_UNQUOTE(JSON_EXTRACT()). / Division operator := Assign a value = Assign a value (as part of a SET statement, or as part of the SET clause in an ...
https://dev.mysql.com/doc/refman/8.0/en/optimizer-features-to-trace.html
Some features in the optimizer can be invoked many times during statement optimization and execution, and thus can make the trace grow beyond reason. Range optimizer Dynamic range optimization: Shown as range checked for each record in EXPLAIN ...
https://dev.mysql.com/doc/refman/8.0/en/other-vendor-data-types.html
To facilitate the use of code written for SQL implementations from other vendors, MySQL maps data types as shown in the following table. These mappings make it easier to import table definitions from other database systems into MySQL. If you create ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-columns.html
All of these columns are taken into account both for the purpose of placing rows in partitions and for the determination of which partitions are to be checked for matching rows in partition pruning. The next two sections discuss COLUMNS ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-query-profiling.html
The following example demonstrates how to use Performance Schema statement events and stage events to retrieve data comparable to profiling information provided by SHOW PROFILES and SHOW PROFILE statements. The setup_actors table can be used to ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-applier-configuration-table.html
The replication_applier_configuration table has these columns: CHANNEL_NAME The replication channel which this row is displaying. REQUIRE_ROW_FORMAT Whether the channel accepts only row-based events (CHANGE REPLICATION SOURCE TO option: ... This ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-thread-pool-tables.html
In the case of tp_thread_state, all rows for a thread group comprise a snapshot in time. Note The Performance Schema tables described here are available as of MySQL 8.0.14. Prior to MySQL 8.0.14, use the corresponding INFORMATION_SCHEMA tables ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-tp-thread-group-state-table.html
The tp_thread_group_state table has one row per thread group in the thread pool. Each row provides information about the current state of a group. Note The Performance Schema table described here is available as of MySQL 8.0.14. Prior to MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-tp-thread-state-table.html
The tp_thread_state table has one row per thread created by the thread pool to handle connections. Note The Performance Schema table described here is available as of MySQL 8.0.14. Prior to MySQL 8.0.14, use the corresponding INFORMATION_SCHEMA ...