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https://dev.mysql.com/doc/refman/9.7/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/9.7/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/9.7/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/9.7/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/9.7/en/performance-schema-temporary-account-locks-table.html
PASSWORD_LOCK_TIME Lock time, in days, as defined in the password locking policy. The temporary_account_locks table lists the users with temporarily locked accounts. The temporary_account_locks table has these columns: USER The user name of the ...
https://dev.mysql.com/doc/refman/9.7/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/9.7/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/9.7/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/9.7/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/9.7/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 ...