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https://dev.mysql.com/doc/refman/9.7/en/partitioning-linear-hash.html
MySQL also supports linear hashing, which differs from regular hashing in that linear hashing utilizes a linear powers-of-two algorithm whereas regular hashing employs the modulus of the hashing function's value. We call this value V; it can be ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-pruning.html
The optimization known as partition pruning is based on a relatively simple concept which can be described as “Do not scan partitions where there can be no matching values”. By limiting the search, it is possible to expend much less time and ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-range.html
A table that is partitioned by range is partitioned in such a way that each partition contains rows for which the partitioning expression value lies within a given range. Ranges should be contiguous but not overlapping, and are defined using the ...
https://dev.mysql.com/doc/refman/9.7/en/pattern-matching.html
MySQL provides standard SQL pattern matching as well as a form of pattern matching based on extended regular expressions similar to those used by Unix utilities such as vi, grep, and sed. SQL pattern matching enables you to use _ to match any ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-events-waits-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored wait event, so there is no system variable for configuring the table size. Of the tables that contain wait event rows, events_waits_current is the ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-instrument-filtering.html
The setup_instruments table lists the available instruments: mysql> SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments; +---------------------------------------------------+---------+-------+ | NAME | ENABLED | TIMED | ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-setup-instruments-table.html
The setup_instruments table lists classes of instrumented objects for which events can be collected: mysql> SELECT * FROM performance_schema.setup_instruments\G *************************** 1. row *************************** NAME: ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-tp-thread-state-table.html
The tp_thread_state table has one row per thread created by the thread pool to handle connections. The tp_thread_state table has these columns: TP_GROUP_ID The thread group ID. TP_GROUP_ID and TP_THREAD_NUMBER together provide a unique key within ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-variables-metadata-table.html
The variables_metadata table shows, for each server system variable, its name, scope, type, range of values (where applicable), and description. VARIABLE_SCOPE The variable's scope; this is one of the values listed here: GLOBAL The variable is ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-wait-summary-tables.html
The Performance Schema maintains tables for collecting current and recent wait events, and aggregates that information in summary tables. Section 29.12.4, “Performance Schema Wait Event Tables” describes the events on which wait summaries are ...