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https://dev.mysql.com/doc/refman/5.7/en/replication-options-source.html
auto_increment_increment and auto_increment_offset affect AUTO_INCREMENT column behavior as follows: auto_increment_increment controls the interval between successive column values. The highest value present in the col column prior to the INSERT is ... This section describes the server options and system variables that you can use on replication source ...
https://dev.mysql.com/doc/refman/5.7/en/trigger-syntax.html
(Such a SET statement has no effect in an AFTER trigger because the row change has already occurred.) In a BEFORE trigger, the NEW value for an AUTO_INCREMENT column is 0, not the sequence number that is generated automatically when the new row ...
https://dev.mysql.com/doc/refman/5.7/en/order-by-optimization.html
The index may also be used even if the ORDER BY does not match the index exactly, as long as all unused portions of the index and all extra ORDER BY columns are constants in the WHERE clause. If the index does not contain all columns accessed by the ... This section describes when MySQL can use an index to satisfy an ORDER BY clause, the filesort operation used when an index cannot be used, and execution plan information available from the optimizer about ORDER ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-statement-summary-tables.html
Each statement 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: events_statements_summary_by_account_by_event_name has ... The ...
https://dev.mysql.com/doc/refman/5.7/en/grant.html
Database, table, column, and routine names can be up to 64 characters. Object Quoting Guidelines Several objects within GRANT statements are subject to quoting, although quoting is optional in many cases: Account, database, table, column, and ...
https://dev.mysql.com/doc/refman/5.7/en/compressed-format.html
Compressed storage format is a read-only format that is generated with the myisampack tool. If values in an integer column have a small range, the column is stored using the smallest possible type. For example, a BIGINT column (eight bytes) can be ...Compressed tables have the following characteristics: Compressed tables take very little disk ...
https://dev.mysql.com/doc/refman/5.7/en/constraint-enum.html
ENUM and SET columns provide an efficient way to define columns that can contain only a given set of values. Unless strict mode is disabled (not recommended, but see Section 5.1.10, “Server SQL Modes”), the definition of a ENUM or SET column ...
https://dev.mysql.com/doc/refman/5.7/en/cost-model.html
To generate execution plans, the optimizer uses a cost model that is based on estimates of the cost of various operations that occur during query execution. DBAs can use this column to provide information about why a cost estimate row stores a ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-table-reference.html
The following table summarizes all available INFORMATION_SCHEMA tables. For greater detail, see the individual table descriptions. Table 24.1 INFORMATION_SCHEMA Tables Table Name Description Introduced Deprecated CHARACTER_SETS Available character ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-index-types.html
If a table has no PRIMARY KEY or suitable UNIQUE index, InnoDB generates a hidden clustered index named GEN_CLUST_INDEX on a synthetic column that contains row ID values. If there is no logical unique and non-null column or set of columns to use a ... Each InnoDB table has a special index called the clustered index that stores row ...