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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-system-variables.html
The Performance Schema automatically sizes the values of several of its parameters at server startup if they are not set explicitly. Performance Schema system variables have the following meanings: performance_schema Command-Line Format ...At server ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-object-index.html
The following tables list sys schema objects and provide a short description of each one.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-options.html
Performance Schema parameters can be specified at server startup on the command line or in option files to configure Performance Schema instruments and consumers. Runtime configuration is also possible in many cases (see Section 25.4, ...Consumer ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-startup-configuration.html
To use the MySQL Performance Schema, it must be enabled at server startup to enable event collection to occur. Assuming that the Performance Schema is available, it is enabled by default. To enable or disable it explicitly, start the server with ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-statement-digests.html
Digesting occurs in the parser regardless of whether the Performance Schema is available, so that other server components such as MySQL Enterprise Firewall and query rewrite plugins have access to statement digests. If the Performance Schema has ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema.html
The MySQL Performance Schema is a feature for monitoring MySQL Server execution at a low level. The Performance Schema has these characteristics: The Performance Schema provides a way to inspect internal execution of the server at runtime. It is ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-quick-start.html
This section briefly introduces the Performance Schema with examples that show how to use it. For additional examples, see Section 25.19, “Using the Performance Schema to Diagnose Problems”. To enable or disable it explicitly, start the server ...Check the server error log for information about what went ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-statement-tables.html
For more information about the relationship between the three events_statements_xxx event tables, see Section 25.9, “Performance Schema Tables for Current and Historical Events”. When the Performance Schema instruments a request (server command ...Statement events occur at a high level of the event ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-variable-table-migration.html
The INFORMATION_SCHEMA has tables that contain system and status variable information (see Section 24.3.11, “The INFORMATION_SCHEMA GLOBAL_VARIABLES and SESSION_VARIABLES Tables”, and Section 24.3.10, “The INFORMATION_SCHEMA GLOBAL_STATUS and ...Applications should run as is, with no code changes, and should see the same variable names and values as in MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-option-variable-reference.html
Table 25.13 Performance Schema Variable Reference Name Cmd-Line Option File System Var Status Var Var Scope Dynamic performance_schema Yes Yes Yes Global No Performance_schema_accounts_lost Yes Global No performance_schema_accounts_size Yes Yes Yes ...