Maximum length for MySQL type text

Question

I m creating a form for sending private messages and want to set the maxlength value of a textarea appropriate to the max length of a text field in my MySQL database table  How many characters can a type text field store   If a lot  would I be able to specify length in the database text type field as I would with varchar

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Type         Approx  Length       Exact Max  Length Allowed ----------------------------------------------------------- TINYTEXT     256 Bytes                      255 characters TEXT          64 Kilobytes               65 535 characters MEDIUMTEXT    16 Megabytes           16 777 215 characters LONGTEXT       4 Gigabytes        4 294 967 295 characters  Basically  it s like   quot Exact Max  Length Allowed quot     quot Approx  Length quot  in bytes - 1 Note  If using multibyte characters  like Arabic  where each Arabic character takes 2 bytes   the column  quot Exact Max  Length Allowed quot  for TINYTEXT can hold be up to 127 Arabic characters  Note  space  dash  underscore  and other such characters  are 1-byte characters

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See for maximum numbers  http   dev mysql com doc refman 5 0 en storage-requirements html  TINYBLOB  TINYTEXT       L   1 bytes  where L  lt  2 8     255 Bytes  BLOB  TEXT               L   2 bytes  where L  lt  2 16    64 Kilobytes  MEDIUMBLOB  MEDIUMTEXT   L   3 bytes  where L  lt  2 24    16 Megabytes  LONGBLOB  LONGTEXT       L   4 bytes  where L  lt  2 32    4 Gigabytes    L is the number of bytes in your text field  So the maximum number of chars for text is 216-1  using single-byte characters   Means 65 535 chars using single-byte characters    UTF-8 MultiByte encoding  using MultiByte encoding each character might consume more than 1 byte of space  For UTF-8 space consumption is between 1 to 4 bytes per char

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TINYTEXT  256 bytes TEXT  65 535 bytes MEDIUMTEXT  16 777 215 bytes LONGTEXT  4 294 967 295 bytes

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For the MySql version 8 0   Numeric Type Storage Requirements  Data Type       Storage Required TINYINT         1 byte SMALLINT        2 bytes MEDIUMINT       3 bytes INT  INTEGER    4 bytes BIGINT          8 bytes FLOAT p         4 bytes if 0  lt   p  lt   24  8 bytes if 25  lt   p  lt   53 FLOAT           4 bytes DOUBLE  REAL    8 bytes DECIMAL M D   NUMERIC M D   Varies  see following discussion BIT M   approximately  M 7  8 bytes   Values for DECIMAL  and NUMERIC  columns are represented using a binary format that packs nine decimal  base 10  digits into four bytes  Storage for the integer and fractional parts of each value are determined separately  Each multiple of nine digits requires four bytes  and the    leftover    digits require some fraction of four bytes  The storage required for excess digits is given by the following table   Date and Time Type Storage Requirements For TIME  DATETIME  and TIMESTAMP columns  the storage required for tables created before MySQL 5 6 4 differs from tables created from 5 6 4 on  This is due to a change in 5 6 4 that permits these types to have a fractional part  which requires from 0 to 3 bytes   Data Type   Storage Required Before MySQL 5 6 4   Storage Required as of MySQL 5 6 4 YEAR        1 byte                                1 byte DATE        3 bytes                               3 bytes TIME        3 bytes                               3 bytes   fractional seconds storage DATETIME    8 bytes                               5 bytes   fractional seconds storage TIMESTAMP   4 bytes                               4 bytes   fractional seconds storage   As of MySQL 5 6 4  storage for YEAR and DATE remains unchanged  However  TIME  DATETIME  and TIMESTAMP are represented differently  DATETIME is packed more efficiently  requiring 5 rather than 8 bytes for the nonfractional part  and all three parts have a fractional part that requires from 0 to 3 bytes  depending on the fractional seconds precision of stored values   Fractional Seconds Precision    Storage Required 0                               0 bytes 1  2                            1 byte 3  4                            2 bytes 5  6                            3 bytes   For example  TIME 0   TIME 2   TIME 4   and TIME 6  use 3  4  5  and 6 bytes  respectively  TIME and TIME 0  are equivalent and require the same storage   For details about internal representation of temporal values  see MySQL Internals  Important Algorithms and Structures   String Type Storage Requirements In the following table  M represents the declared column length in characters for nonbinary string types and bytes for binary string types  L represents the actual length in bytes of a given string value   Data Type                    Storage Required CHAR M                       The compact family of InnoDB row formats optimize storage for variable-length character sets  See COMPACT Row Format Characteristics  Otherwise  M    w bytes   lt   M  lt   255  where w is the number of bytes required for the maximum-length character in the character set  BINARY M                     M bytes  0  lt   M  lt   255 VARCHAR M   VARBINARY M      L   1 bytes if column values require 0 - 255 bytes  L   2 bytes if values may require more than 255 bytes TINYBLOB  TINYTEXT           L   1 bytes  where L  lt  28 BLOB  TEXT                   L   2 bytes  where L  lt  216 MEDIUMBLOB  MEDIUMTEXT       L   3 bytes  where L  lt  224 LONGBLOB  LONGTEXT           L   4 bytes  where L  lt  232 ENUM  value1   value2        1 or 2 bytes  depending on the number of enumeration values  65 535 values maximum  SET  value1   value2         1  2  3  4  or 8 bytes  depending on the number of set members  64 members maximum

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Acording to http   dev mysql com doc refman 5 0 en storage-requirements html  the limit is L   2 bytes  where L  lt  2 16  or 64k   You shouldn t need to concern yourself with limiting it  it s automatically broken down into chunks that get added as the string grows  so it won t always blindly use 64k

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TEXT is a string data type that can store up to 65 535 characters  But still if you want to store more data then change its data type to LONGTEXT  ALTER TABLE name tabel CHANGE text field LONGTEXT CHARACTER SET utf8 COLLATE utf8 general ci NOT NULL

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How many characters can a type text field store    According to Documentation You can use maximum of 21 844 characters if the charset is UTF8     If a lot  would I be able to specify length in the db text type field as I would with varchar    You dont need to specify the length  If you need more character use data types MEDIUMTEXT or LONGTEXT  With VARCHAR  specifieng length is not for Storage requirement  it is only for how the data is retrieved from data base

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TINYTEXT 256 bytes TEXT 65 535 bytes  64kb MEDIUMTEXT 16 777 215 bytes  16MB LONGTEXT 4 294 967 295 bytes  4GB    TINYTEXT is a string data type that can store up to to 255 characters   TEXT is a string data type that can store up to 65 535 characters  TEXT is commonly used for brief articles   LONGTEXT is a string data type with a maximum length of 4 294 967 295 characters  Use LONGTEXT if you need to store large text  such as a chapter of a novel

[mysql] Maximum length for MySQL type text

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