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https://dev.mysql.com/char.html
The CHAR and VARCHAR types are similar, but differ in the way they are stored and retrieved. The CHAR and VARCHAR types are declared with a length that indicates the maximum number of characters you want to store. The effective maximum length of a ...They also differ in maximum length and in whether trailing spaces are ...
https://dev.mysql.com/column-count-limit.html
mysql> CREATE TABLE t (a VARCHAR(10000), b VARCHAR(10000), c VARCHAR(10000), d VARCHAR(10000), e VARCHAR(10000), f VARCHAR(10000), g VARCHAR(6000)) ENGINE=InnoDB CHARACTER SET latin1; ERROR 1118 (42000): Row size too large. You have to change some ... MySQL has hard limit of 4096 columns per table, but the effective maximum may be less for a given ...
https://dev.mysql.com/partitioning-range.html
A table that is partitioned by range is partitioned in such a way that each partition contains rows for which the partitioning expression value lies within a given range. Ranges should be contiguous but not overlapping, and are defined using the ...
https://dev.mysql.com/string-type-overview.html
Column definitions for character string data types CHAR, VARCHAR, the TEXT types, ENUM, SET, and any synonyms) can specify the column character set and collation: CHARACTER SET specifies the character set. Specifying the CHARACTER SET binary ...For ...
https://dev.mysql.com/innodb-online-ddl-operations.html
Extending VARCHAR column size ALTER TABLE tbl_name CHANGE COLUMN c1 c1 VARCHAR(255), ALGORITHM=INPLACE, LOCK=NONE; The number of length bytes required by a VARCHAR column must remain the same. For VARCHAR columns of 0 to 255 bytes in size, one ...
https://dev.mysql.com/partitioning-columns-list.html
This is a variant of LIST partitioning that enables the use of multiple columns as partition keys, and for columns of data types other than integer types to be used as partitioning columns; you can use string types, DATE, and DATETIME columns. In ...
https://dev.mysql.com/innodb-memcached-setup.html
mysql> CREATE TABLE city ( city_id VARCHAR(32), name VARCHAR(1024), state VARCHAR(1024), country VARCHAR(1024), flags INT, cas BIGINT UNSIGNED, expiry INT, primary key(city_id) ) ENGINE=InnoDB; Add an entry to the innodb_memcache.containers table so ... This section describes how to set up the daemon_memcached plugin on a MySQL ...
https://dev.mysql.com/partitioning-management-exchange.html
Table nt contains no foreign key references, and no other table has any foreign keys that refer to nt. There are no rows in nt that lie outside the boundaries of the partition definition for p. To determine the row format of an InnoDB table, query ...
https://dev.mysql.com/signal.html
Item Name Definition --------- ---------- CLASS_ORIGIN VARCHAR(64) SUBCLASS_ORIGIN VARCHAR(64) CONSTRAINT_CATALOG VARCHAR(64) CONSTRAINT_SCHEMA VARCHAR(64) CONSTRAINT_NAME VARCHAR(64) CATALOG_NAME VARCHAR(64) SCHEMA_NAME VARCHAR(64) TABLE_NAME ...
https://dev.mysql.com/partitioning-management-range-list.html
Adding and dropping of range and list partitions are handled in a similar fashion, so we discuss the management of both sorts of partitioning in this section. For information about working with tables that are partitioned by hash or key, see ...
Document created the 26/06/2006, last modified the 26/10/2018
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