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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-session-connect-attrs-table.html
Application programs can provide key-value connection attributes to be passed to the server at connect time. For descriptions of common attributes, see Section 29.12.9, “Performance Schema Connection Attribute Tables”. To see connection ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-consumers-table.html
If you disable a consumer, the server does not spend time adding event information to it. For detailed information about the effect of enabling different consumers, see Section 29.4.7, “Pre-Filtering by Consumer”. The setup_consumers table has ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-monitoring.html
For example, if a mutex is instrumented in the server source but the server cannot allocate memory for the instrumentation at runtime, it increments Performance_schema_mutex_classes_lost. Other mutexes have an instance per connection, or per page in ...Names for these variables have several forms: Performance_schema_xxx_classes_lost indicates how many instruments of type xxx could not be ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-summary-tables.html
Summary tables provide aggregated information for terminated events over time. That might be useful, for example, after you have made a runtime configuration change. The tables in this group summarize event data in different ways. Each summary ...
https://dev.mysql.com/doc/refman/8.0/en/platform-support.html
MySQL platform support evolves over time; please refer to https://www.mysql.com/support/supportedplatforms/database.html for the latest updates.
https://dev.mysql.com/doc/refman/8.0/en/plugin-loading.html
It is also possible to control the activation state of loaded plugins at startup, and to unload them at runtime. That is, the option produces a one-time plugin-installation operation that persists for a single server invocation. --plugin-load, ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math.html
For example, MySQL treats a number such as .0001 as an exact value rather than as an approximation, and summing it 10,000 times produces a result of exactly 1, not a value that is merely “close” to 1. MySQL provides support for precision math: ...
https://dev.mysql.com/doc/refman/8.0/en/privilege-changes.html
Database privilege changes take effect the next time the client executes a USE db_name statement. If the mysqld server is started without the --skip-grant-tables option, it reads all grant table contents into memory during its startup sequence. The ...
https://dev.mysql.com/doc/refman/8.0/en/privileges-provided.html
Privileges also differ in terms of whether they are static (built in to the server) or dynamic (defined at runtime). SUPER affects the following operations and server behaviors: Enables system variable changes at runtime: Enables server ... The ...
https://dev.mysql.com/doc/refman/8.0/en/problems-connecting.html
Otherwise, your changes have no effect until the next time the server is restarted. If you encounter problems when you try to connect to the MySQL server, the following items describe some courses of action you can take to correct the problem. To ...