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https://dev.mysql.com/doc/refman/5.7/en/sys-format-statement.html
Configuration Options format_statement() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 26.4.2.1, “The sys_config Table”): statement_truncate_len, ... Given a string ...
https://dev.mysql.com/doc/refman/5.7/en/sys-host-summary.html
These views summarize statement activity, file I/O, and connections, grouped by host. The host_summary and x$host_summary views have these columns: host The host from which the client connected. Rows for which the HOST column in the underlying ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-reset-to-default.html
row *************************** status: Resetting: setup_actors DELETE FROM performance_schema.setup_actors WHERE NOT (HOST = '%' AND USER = '%' AND ROLE = '%') *************************** 1. Parameters in_verbose BOOLEAN: Whether to display ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-thread-trx-info.html
Configuration Options ps_thread_trx_info() operation can be modified using the following configuration options or their corresponding user-defined variables (see Section 26.4.2.1, “The sys_config Table”): ps_thread_trx_info.max_length, ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-prerequisites.html
Before using the sys schema, the prerequisites described in this section must be satisfied. Because the sys schema provides an alternative means of accessing the Performance Schema, the Performance Schema must be enabled for the sys schema to work.
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-table-statistics-with-buffer.html
These views summarize table statistics, including InnoDB buffer pool statistics. By default, rows are sorted by descending total wait time (tables with most contention first). The schema_table_statistics_with_buffer and ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-table-statistics.html
By default, rows are sorted by descending total wait time (tables with most contention first). The schema_table_statistics and x$schema_table_statistics views have these columns: table_schema The schema that contains the table. total_latency The ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-views.html
The sys schema contains many views that summarize Performance Schema tables in various ways. Most of these views come in pairs, such that one member of the pair has the same name as the other member, plus a x$ prefix. The view with the x$ prefix ...
https://dev.mysql.com/doc/refman/5.7/en/sys-session.html
These views are similar to processlist and x$processlist, but they filter out background processes to display only user sessions. For descriptions of the columns, see Section 26.4.3.22, “The processlist and x$processlist Views”.
https://dev.mysql.com/doc/refman/5.7/en/thread-pool-tuning.html
Stalled statements generate a lot of extra overhead since they involve extra context switches and in some cases even extra thread creations. If the application has high requirements for the response time, it should most likely throttle users at a ...