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https://dev.mysql.com/doc/refman/8.0/en/column-indexes.html
Index Prefixes FULLTEXT Indexes Spatial Indexes Indexes in the MEMORY Storage Engine Index Prefixes With col_name(N) syntax in an index specification for a string column, you can create an index that uses only the first N characters of the column.
https://dev.mysql.com/doc/refman/8.0/en/data-size.html
The compact family of row formats also optimizes CHAR column storage when using a variable-length character set such as utf8mb3 or utf8mb4. With ROW_FORMAT=REDUNDANT, CHAR(N) occupies N × the maximum byte length of the character set. Many languages ... Design your tables to minimize their space on the ...
https://dev.mysql.com/doc/refman/8.0/en/example-auto-increment.html
You can also explicitly assign 0 to the column to generate sequence numbers, unless the NO_AUTO_VALUE_ON_ZERO SQL mode is enabled. For example: INSERT INTO animals (id,name) VALUES(0,'groundhog'); If the column is declared NOT NULL, it is also ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-system-tables.html
The FLAG field provides bit level information about table format and storage characteristics. You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA tables. Traditionally, you would get this type of ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-internals.html
table_map_delimiter: The character separating the schema name and the table name when you use the @@ notation in a key name to access a key in a specific table. Multiple columns can be specified using the separator character specified in the ...
https://dev.mysql.com/doc/refman/8.0/en/multiple-column-indexes.html
The index can be used for lookups in queries that specify values in a known range for combinations of last_name and first_name values. MySQL can create composite indexes (that is, indexes on multiple columns). For certain data types, you can index ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-select-all.html
--delimiter=character, -D character Causes the character to be used as a column delimiter. ndb_select_all prints all rows from an NDB table to stdout. Usage ndb_select_all -c connection_string tbl_name -d db_name [> file_name] Options that can be ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-replication-conflict-resolution.html
Requirements Source Column Control Conflict Resolution Control Conflict Resolution Functions Conflict Resolution Exceptions Table Conflict Detection Status Variables Examples When using a replication setup involving multiple sources (including ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-columns-range.html
Each value list used to define a partition contains 3 values in the same order; that is, each value list tuple has the form (INT, INT, CHAR(3)), which corresponds to the data types used by columns a, d, and c (in that order). In addition, changing ... Range columns partitioning is similar to range partitioning, but enables you to define partitions using ranges based on multiple column ...
https://dev.mysql.com/doc/refman/8.0/en/query-attributes.html
Query attribute names are transmitted using the character set indicated by the character_set_client system variable. The most visible part of an SQL statement is the text of the statement. As of MySQL 8.0.23, clients can also define query ...