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https://dev.mysql.com/doc/refman/5.7/en/sql-prepared-statements.html
Using prepared statements with placeholders for parameter values has the following benefits: Less overhead for parsing the statement each time it is executed. Typically, database applications process large volumes of almost-identical statements, ...
https://dev.mysql.com/doc/refman/5.7/en/storage-requirements.html
To calculate the number of bytes used to store a particular CHAR, VARCHAR, or TEXT column value, you must take into account the character set used for that column and whether the value contains multibyte characters. InnoDB Table Storage ...
https://dev.mysql.com/doc/refman/5.7/en/string-literals.html
As an alternative to explicitly escaping special characters, many MySQL APIs provide a placeholder capability that enables you to insert special markers into a statement string, and then bind data values to them when you issue the statement. A ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-materialization.html
The first time MySQL needs the subquery result, it materializes that result into a temporary table. The optimizer uses materialization to enable more efficient subquery processing. Materialization speeds up query execution by generating a subquery ...
https://dev.mysql.com/doc/refman/5.7/en/switchable-optimizations.html
Derived Table Merging Flags derived_merge (default on) Controls merging of derived tables and views into outer query block. The derived_merge flag controls whether the optimizer attempts to merge derived tables and view references into the outer ...
https://dev.mysql.com/doc/refman/5.7/en/sys-ps-thread-trx-info.html
Returns a JSON object containing information about a given thread. The information includes the current transaction, and the statements it has already executed, derived from the Performance Schema events_transactions_current and ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema-index-statistics.html
insert_latency The total wait time of timed inserts into the index. The schema_index_statistics and x$schema_index_statistics views have these columns: table_schema The schema that contains the table. select_latency The total wait time of timed ...
https://dev.mysql.com/doc/refman/5.7/en/system-schema.html
Miscellaneous System Tables Other system tables do not fall into the preceding categories: audit_log_filter, audit_log_user: If MySQL Enterprise Audit is installed, these tables provide persistent storage of audit log filter definitions and user ...
https://dev.mysql.com/doc/refman/5.7/en/table-locking.html
But because only one session can write to a table at any one time, for best performance with these other storage engines, use them primarily for tables that are queried often and rarely inserted into or updated. Splitting table contents into ...
https://dev.mysql.com/doc/refman/5.7/en/table-size-limit.html
Generally, partitioning of tables into multiple tablespace files is recommended for tables larger than 1TB in size. The effective maximum table size for MySQL databases is usually determined by operating system constraints on file sizes, not by ...