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https://dev.mysql.com/doc/refman/8.0/en/derived-condition-pushdown-optimization.html
When a derived table cannot be merged into the outer query (for example, if the derived table uses aggregation), pushing the outer WHERE condition down to the derived table should decrease the number of rows that need to be processed and thus speed ... MySQL 8.0.22 and later supports derived condition pushdown for eligible ...
https://dev.mysql.com/doc/refman/8.0/en/creating-tables.html
If you make a poor choice and it turns out later that you need a longer field, MySQL provides an ALTER TABLE statement. You want a table that contains a record for each of your pets. This can be called the pet table, and it should contain, as a bare ...For example, if more than one person in your family keeps pets, you might want to list each animal's ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-management.html
There are a number of ways using SQL statements to modify partitioned tables; it is possible to add, drop, redefine, merge, or split existing partitions using the partitioning extensions to the ALTER TABLE statement. To change a table's ...There ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-myisam-bulk-data-loading.html
For a MyISAM table, you can use concurrent inserts to add rows at the same time that SELECT statements are running, if there are no deleted rows in middle of the data file. With some extra work, it is possible to make LOAD DATA run even faster for a ... These performance tips supplement the general guidelines for fast inserts in Section 10.2.5.1, “Optimizing INSERT ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-online-add-node-remarks.html
The ability to add new nodes online includes a means to reorganize NDBCLUSTER table data and indexes so that they are distributed across all data nodes, including the new ones, by means of the ALTER TABLE ... However, it is not possible to perform ...Table reorganization of both in-memory and Disk Data tables is ... This section provides general information about the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-ft-config-table.html
The INNODB_FT_CONFIG table provides metadata about the FULLTEXT index and associated processing for an InnoDB table. Before querying it, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table ...The values for this column might change, depending on the needs for performance tuning and debugging for InnoDB full-text ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-transactions-current-table.html
The table stores one row per thread showing the current status of the thread's most recent monitored transaction event, so there is no system variable for configuring the table size. Other tables that contain transaction event rows are logically ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-prepared-statements-instances-table.html
This is accessed through the MySQL C API and maps onto underlying server commands as shown in the following table. This is accessed using SQL statements and maps onto underlying server commands as shown in the following table. This table enables ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-processlist-table.html
Note If the performance_schema_show_processlist system variable is enabled, the processlist table also serves as the basis for an alternative implementation underlying the SHOW PROCESSLIST statement. As mentioned previously, if the ...For a ... The ...
https://dev.mysql.com/doc/refman/8.0/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 ...Example wait event summary information: mysql> SELECT * FROM performance_schema.events_waits_summary_global_by_event_name\G ...