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https://dev.mysql.com/doc/refman/5.7/en/partitioning-limitations-locking.html
In MySQL 5.7, partition lock pruning eliminates unneeded locks in many cases, and most statements reading from or updating a partitioned MyISAM table cause only the effected partitions to be locked. For example, a SELECT from a partitioned MyISAM ...
https://dev.mysql.com/doc/refman/5.7/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/5.7/en/performance-schema-instrumentation-checking.html
It is always possible to determine what instruments the Performance Schema includes by checking the setup_instruments table. Changes to this code occur often, which also affects the set of instruments. It is not practical to list all the ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-pre-filtering.html
Pre-filtering is done by the Performance Schema and has a global effect that applies to all users. Pre-filtering can be applied to either the producer or consumer stage of event processing: To configure pre-filtering at the producer stage, several ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-setup-objects-table.html
The setup_objects table controls whether the Performance Schema monitors particular objects. This table has a maximum size of 100 rows by default. To change the table size, modify the performance_schema_setup_objects_size system variable at server ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-socket-instances-table.html
The socket_instances table provides a real-time snapshot of the active connections to the MySQL server. The table contains one row per TCP/IP or Unix socket file connection. Information available in this table provides a real-time snapshot of the ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-status-variables.html
Performance Schema status variables have the following meanings: Performance_schema_accounts_lost The number of times a row could not be added to the accounts table because it was full. Performance_schema_digest_lost The number of digest instances ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-system-variable-tables.html
Note The value of the show_compatibility_56 system variable affects the information available from the tables described here. For details, see the description of that variable in Section 5.1.7, “Server System Variables”. The MySQL server ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-thread-filtering.html
The threads table contains a row for each server thread. Each row contains information about a thread and indicates whether monitoring is enabled for it. For the Performance Schema to monitor a thread, these things must be true: The ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-transaction-tables.html
Within the event hierarchy, wait events nest within stage events, which nest within statement events, which nest within transaction events. These tables store transaction events: events_transactions_current: The current transaction event for each ...