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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-stages-history-table.html
When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a new row for that thread is added. The events_stages_history table contains the N most recent stage events that have ended per thread.
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-statements-history-table.html
When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a new row for that thread is added. The events_statements_history table contains the N most recent statement events that have ended per ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-transactions-history-table.html
When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a new row for that thread is added. The events_transactions_history table contains the N most recent transaction events that have ended ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-waits-history-table.html
When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a new row for that thread is added. The events_waits_history table contains the N most recent wait events that have ended per thread.
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-setup-show-enabled.html
Displays all currently enabled Performance Schema configuration. Parameters in_show_instruments BOOLEAN: Whether to display enabled instruments. This might be a long list. in_show_threads BOOLEAN: Whether to display enabled threads. Example mysql> ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-files-table.html
MAXIMUM_SIZE For InnoDB: The maximum number of bytes permitted in the file. SELECT FILE_ID, FILE_NAME, FILE_TYPE, TABLESPACE_NAME, FREE_EXTENTS, TOTAL_EXTENTS, EXTENT_SIZE, INITIAL_SIZE, MAXIMUM_SIZE, AUTOEXTEND_SIZE, DATA_FREE, STATUS FROM ... The ...
https://dev.mysql.com/doc/refman/5.7/en/data-change-optimization.html
For inserting and updating large volumes of data (known in the industry as ETL, for “extract-transform-load”), sometimes you use other SQL statements or external commands, that mimic the effects of INSERT, UPDATE, and DELETE statements. This ...
https://dev.mysql.com/doc/refman/5.7/en/foreign-key-optimization.html
If a table has many columns, and you query many different combinations of columns, it might be efficient to split the less-frequently used data into separate tables with a few columns each, and relate them back to the main table by duplicating the ...
https://dev.mysql.com/doc/refman/5.7/en/gis-class-linestring.html
A LineString is a Curve with linear interpolation between points. LineString Examples On a world map, LineString objects could represent rivers. LineString Properties A LineString has coordinates of segments, defined by each consecutive pair of ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-schema-privileges-table.html
The SCHEMA_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. TABLE_CATALOG The name of the catalog to which the schema belongs. The value can be any privilege ...