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https://dev.mysql.com/doc/refman/5.7/en/partitioning-list.html
The chief difference between the two types of partitioning is that, in list partitioning, each partition is defined and selected based on the membership of a column value in one of a set of value lists, rather than in one of a set of contiguous ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-connection-configuration-table.html
Parameters stored in the table can be changed at runtime with the CHANGE MASTER TO statement, as indicated in the column descriptions. The column descriptions indicate the corresponding CHANGE MASTER TO options from which the column values are ...
https://dev.mysql.com/doc/refman/5.7/en/static-format.html
It is used when the table contains no variable-length columns (VARCHAR, VARBINARY, BLOB, or TEXT). Note Fixed-length row format is only available for tables without BLOB or TEXT columns. Creating a table with these columns with an explicit ...Of the ...
https://dev.mysql.com/doc/refman/5.7/en/using-innodb-tables.html
When selecting primary key columns, choose columns with the following characteristics: Columns that are referenced by the most important queries. For example, in a table containing information about people, you would not create a primary key on ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-statistics-table.html
The STATISTICS table has these columns: TABLE_CATALOG The name of the catalog to which the table containing the index belongs. SEQ_IN_INDEX The column sequence number in the index, starting with 1. That is, the number of indexed characters if the ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-queries.html
Follow these guidelines for InnoDB indexes: Because each InnoDB table has a primary key (whether you request one or not), specify a set of primary key columns for each table, columns that are used in the most important and time-critical queries. Do ... To tune queries for InnoDB tables, create an appropriate set of indexes on each ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-pruning.html
When the optimizer can make use of partition pruning in performing this query, execution of the query can be an order of magnitude faster than the same query against a nonpartitioned table containing the same column definitions and data. The ...The ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-file-summary-tables.html
Each file I/O summary table has one or more grouping columns to indicate how the table aggregates events. Event names refer to names of event instruments in the setup_instruments table: file_summary_by_event_name has an EVENT_NAME column. Each file ... The Performance Schema maintains file I/O summary tables that aggregate information about I/O ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-tables.html
The following sections describe each replication table in more detail, including the correspondence between the columns produced by SHOW SLAVE STATUS and the replication table columns in which the same information appears. At this time, there are no ...This is similar to the information available from the SHOW SLAVE STATUS statement, but representation in table form is more accessible and has usability benefits: SHOW SLAVE STATUS output is useful for visual inspection, but not so much for programmatic ...
https://dev.mysql.com/doc/refman/5.7/en/problems-with-null.html
For example, the following statements are completely different: mysql> INSERT INTO my_table (phone) VALUES (NULL); mysql> INSERT INTO my_table (phone) VALUES (''); Both statements insert a value into the phone column, but the first inserts a NULL ...