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https://dev.mysql.com/doc/refman/8.0/en/subquery-materialization.html
Subquery materialization uses an in-memory temporary table when possible, falling back to on-disk storage if the table becomes too large. Either way, the row from t1 is not included in the query result. This indicates that, for a subquery that would ... The optimizer uses materialization to enable more efficient subquery ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math.html
For example, you can treat a value that is too large for a column as an error rather than having the value truncated to lie within the range of the column's data type. MySQL provides support for precision math: numeric value handling that results ...
https://dev.mysql.com/doc/refman/8.0/en/source-installation-prerequisites.html
If you encounter build errors such as internal compiler error when compiling large source files, it may be that you have too little memory. Some of these tools are needed no matter whether you use a standard source distribution or a development ...
https://dev.mysql.com/doc/refman/8.0/en/sql-prepared-statements.html
Typically, database applications process large volumes of almost-identical statements, with only changes to literal or variable values in clauses such as WHERE for queries and deletes, SET for updates, and VALUES for inserts. To guard against too ...
https://dev.mysql.com/doc/refman/8.0/en/show-table-status.html
The WHERE clause can be given to select rows using more general conditions, as discussed in Section 28.8, “Extensions to SHOW Statements”. For InnoDB tables, the row count is only a rough estimate used in SQL optimization. (This is also true if ... SHOW TABLE STATUS [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLE STATUS works likes SHOW TABLES, but provides a lot of information about each non-TEMPORARY ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-redo-log.html
If innodb_redo_log_capacity is not defined, and if neither innodb_log_file_size or innodb_log_files_in_group are defined, then the default innodb_redo_log_capacity value is used. If innodb_redo_log_capacity is not defined, and if ... The redo log is ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-startup-configuration.html
The other variables indicate table sizes (number of rows) or memory allocation values. Note With the Performance Schema enabled, the number of Performance Schema instances affects the server memory footprint, perhaps to a large extent. For example, ... To use the MySQL Performance Schema, it must be enabled at server startup to enable event collection to ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-benefits.html
InnoDB tables can handle large quantities of data, even on operating systems where file size is limited to 2GB. Performance benefits are not limited to large tables with long-running queries. When the same rows are accessed over and over from a ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-monitoring.html
Increasing the maximum number of connections or the maximum size of some buffers increases the maximum number of instances that might be allocated at once. When the server cannot create a mutex instrument, these results occur: No row for the ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-porting-mysql.html
When using functions such as AVG(), which depend on the number of rows in the result set, include WHERE clauses to filter out non-numeric values. row *************************** name: aaa db_schema: test db_table: demo_test key_columns: c1 ...