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https://dev.mysql.com/doc/refman/5.7/en/string-functions.html
For functions that operate on string positions, the first position is numbered 1. For functions that take length arguments, noninteger arguments are rounded to the nearest integer. ASCII(str) Returns the numeric value of the leftmost character of ...
https://dev.mysql.com/doc/refman/5.7/en/symbolic-links-to-tables.html
For files used by tables for other storage engines, you may get strange problems if you try to use symbolic links. For InnoDB tables, use the alternative technique explained in Section 14.6.1.2, “Creating Tables Externally” instead. Do not ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-usage.html
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 that displays the same values in raw form is intended more for use with other tools that perform ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema.html
MySQL 5.7 includes the sys schema, a set of objects that helps DBAs and developers interpret data collected by the Performance Schema. sys schema objects can be used for typical tuning and diagnosis use cases. Objects in this schema include: Views ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-errors-or-warnings.html
These views display normalized statements that have produced errors or warnings. By default, rows are sorted by descending error and warning counts. The statements_with_errors_or_warnings and x$statements_with_errors_or_warnings views have these ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-full-table-scans.html
These views display normalized statements that have done full table scans. By default, rows are sorted by descending percentage of time a full scan was done and descending total latency. The statements_with_full_table_scans and ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-runtimes-in-95th-percentile.html
These views list statements with runtimes in the 95th percentile. The statements_with_runtimes_in_95th_percentile and x$statements_with_runtimes_in_95th_percentile views have these columns: query The normalized statement string. db The default ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-sorting.html
The statements_with_sorting and x$statements_with_sorting views have these columns: query The normalized statement string. db The default database for the statement, or NULL if there is none. total_latency The total wait time of timed occurrences of ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statements-with-temp-tables.html
These views list normalized statements that have used temporary tables. By default, rows are sorted by descending number of on-disk temporary tables used and descending number of in-memory temporary tables used. The statements_with_temp_tables and ...
https://dev.mysql.com/doc/refman/5.7/en/table-scan-avoidance.html
The output from EXPLAIN shows ALL in the type column when MySQL uses a full table scan to resolve a query. This usually happens under the following conditions: The table is so small that it is faster to perform a table scan than to bother with a ...