Equivalent of varchar max in MySQL

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What is the equivalent of varchar max  in MySQL

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TLDR  MySql does not have an equivalent concept of varchar max   this is a MS SQL Server feature  What is VARCHAR max   varchar max  is a feature of Microsoft SQL Server  The amount of data that a column could store in Microsoft SQL server versions prior to version 2005 was limited to 8KB   In order to store more than 8KB you would have to use TEXT  NTEXT  or BLOB columns types  these column types stored their data as a collection of 8K pages separate from the table data pages  they supported storing up to 2GB per row  The big caveat to these column types was that they usually required special functions and statements to access and modify the data  e g  READTEXT  WRITETEXT  and UPDATETEXT  In SQL Server 2005  varchar max  was introduced to unify the data and queries used to retrieve and modify data in large columns   The data for varchar max  columns is stored inline with the table data pages  As the data in the MAX column fills an 8KB data page an overflow page is allocated and the previous page points to it forming a linked list  Unlike TEXT  NTEXT  and BLOB the varchar max  column type supports all the same query semantics as other column types  So varchar MAX  really means varchar AS MUCH AS I WANT TO STUFF IN HERE JUST KEEP GROWING  and not varchar MAX SIZE OF A COLUMN   MySql does not have an equivalent idiom  In order to get the same amount of storage as a varchar max  in MySql you would still need to resort to a BLOB column type   This article discusses a very effective method of storing large amounts of data in MySql efficiently

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The max length of a varchar in MySQL 5 6 12 is 4294967295

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The max length of a varchar is subject to the max row size in MySQL  which is 64KB  not counting BLOBs    VARCHAR 65535    However  note that the limit is lower if you use a multi-byte character set   VARCHAR 21844  CHARACTER SET utf8     Here are some examples   The maximum row size is 65535  but a varchar also includes a byte or two to encode the length of a given string  So you actually can t declare a varchar of the maximum row size  even if it s the only column in the table   mysql gt  CREATE TABLE foo   v VARCHAR 65534     ERROR 1118  42000   Row size too large  The maximum row size for the used table type  not counting BLOBs  is 65535  This includes storage overhead  check the manual  You have to change some columns to TEXT or BLOBs   But if we try decreasing lengths  we find the greatest length that works   mysql gt  CREATE TABLE foo   v VARCHAR 65532     Query OK  0 rows affected  0 01 sec    Now if we try to use a multibyte charset at the table level  we find that it counts each character as multiple bytes  UTF8 strings don t necessarily use multiple bytes per string  but MySQL can t assume you ll restrict all your future inserts to single-byte characters   mysql gt  CREATE TABLE foo   v VARCHAR 65532    CHARSET utf8  ERROR 1074  42000   Column length too big for column  v   max   21845   use BLOB or TEXT instead   In spite of what the last error told us  InnoDB still doesn t like a length of 21845   mysql gt  CREATE TABLE foo   v VARCHAR 21845    CHARSET utf8  ERROR 1118  42000   Row size too large  The maximum row size for the used table type  not counting BLOBs  is 65535  This includes storage overhead  check the manual  You have to change some columns to TEXT or BLOBs   This makes perfect sense  if you calculate that 21845 3   65535  which wouldn t have worked anyway  Whereas 21844 3   65532  which does work   mysql gt  CREATE TABLE foo   v VARCHAR 21844    CHARSET utf8  Query OK  0 rows affected  0 32 sec

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TLDR  MySql does not have an equivalent concept of varchar max   this is a MS SQL Server feature  What is VARCHAR max   varchar max  is a feature of Microsoft SQL Server  The amount of data that a column could store in Microsoft SQL server versions prior to version 2005 was limited to 8KB   In order to store more than 8KB you would have to use TEXT  NTEXT  or BLOB columns types  these column types stored their data as a collection of 8K pages separate from the table data pages  they supported storing up to 2GB per row  The big caveat to these column types was that they usually required special functions and statements to access and modify the data  e g  READTEXT  WRITETEXT  and UPDATETEXT  In SQL Server 2005  varchar max  was introduced to unify the data and queries used to retrieve and modify data in large columns   The data for varchar max  columns is stored inline with the table data pages  As the data in the MAX column fills an 8KB data page an overflow page is allocated and the previous page points to it forming a linked list  Unlike TEXT  NTEXT  and BLOB the varchar max  column type supports all the same query semantics as other column types  So varchar MAX  really means varchar AS MUCH AS I WANT TO STUFF IN HERE JUST KEEP GROWING  and not varchar MAX SIZE OF A COLUMN   MySql does not have an equivalent idiom  In order to get the same amount of storage as a varchar max  in MySql you would still need to resort to a BLOB column type   This article discusses a very effective method of storing large amounts of data in MySql efficiently

User · Answer

The max length of a varchar is subject to the max row size in MySQL  which is 64KB  not counting BLOBs    VARCHAR 65535    However  note that the limit is lower if you use a multi-byte character set   VARCHAR 21844  CHARACTER SET utf8     Here are some examples   The maximum row size is 65535  but a varchar also includes a byte or two to encode the length of a given string  So you actually can t declare a varchar of the maximum row size  even if it s the only column in the table   mysql gt  CREATE TABLE foo   v VARCHAR 65534     ERROR 1118  42000   Row size too large  The maximum row size for the used table type  not counting BLOBs  is 65535  This includes storage overhead  check the manual  You have to change some columns to TEXT or BLOBs   But if we try decreasing lengths  we find the greatest length that works   mysql gt  CREATE TABLE foo   v VARCHAR 65532     Query OK  0 rows affected  0 01 sec    Now if we try to use a multibyte charset at the table level  we find that it counts each character as multiple bytes  UTF8 strings don t necessarily use multiple bytes per string  but MySQL can t assume you ll restrict all your future inserts to single-byte characters   mysql gt  CREATE TABLE foo   v VARCHAR 65532    CHARSET utf8  ERROR 1074  42000   Column length too big for column  v   max   21845   use BLOB or TEXT instead   In spite of what the last error told us  InnoDB still doesn t like a length of 21845   mysql gt  CREATE TABLE foo   v VARCHAR 21845    CHARSET utf8  ERROR 1118  42000   Row size too large  The maximum row size for the used table type  not counting BLOBs  is 65535  This includes storage overhead  check the manual  You have to change some columns to TEXT or BLOBs   This makes perfect sense  if you calculate that 21845 3   65535  which wouldn t have worked anyway  Whereas 21844 3   65532  which does work   mysql gt  CREATE TABLE foo   v VARCHAR 21844    CHARSET utf8  Query OK  0 rows affected  0 32 sec

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Mysql Converting column  from VARCHAR to TEXT when under limit size     mysql gt  CREATE TABLE varchars1 ch3 varchar 6  ch1 varchar 3  ch varchar 4000000     Query OK  0 rows affected  1 warning  0 00 sec   mysql gt  SHOW WARNINGS   ------- ------ ---------------------------------------------    Level   Code   Message                                        ------- ------ ---------------------------------------------    Note    1246   Converting column  ch  from VARCHAR to TEXT    ------- ------ ---------------------------------------------  1 row in set  0 00 sec   mysql gt

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Mysql Converting column  from VARCHAR to TEXT when under limit size     mysql gt  CREATE TABLE varchars1 ch3 varchar 6  ch1 varchar 3  ch varchar 4000000     Query OK  0 rows affected  1 warning  0 00 sec   mysql gt  SHOW WARNINGS   ------- ------ ---------------------------------------------    Level   Code   Message                                        ------- ------ ---------------------------------------------    Note    1246   Converting column  ch  from VARCHAR to TEXT    ------- ------ ---------------------------------------------  1 row in set  0 00 sec   mysql gt

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The max length of a varchar is   65535  divided by the max byte length of a character in the character set the column is set to  e g  utf8 3 bytes  ucs2 2  latin1 1    minus 2 bytes to store the length  minus the length of all the other columns  minus 1 byte for every 8 columns that are nullable  If your column is null not null this gets stored as one bit in a byte bytes called the null mask  1 bit per column that is nullable

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The max length of a varchar in MySQL 5 6 12 is 4294967295

User · Answer

The max length of a varchar is   65535  divided by the max byte length of a character in the character set the column is set to  e g  utf8 3 bytes  ucs2 2  latin1 1    minus 2 bytes to store the length  minus the length of all the other columns  minus 1 byte for every 8 columns that are nullable  If your column is null not null this gets stored as one bit in a byte bytes called the null mask  1 bit per column that is nullable

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For Sql Server  alter table prg ar report colors add Text Color Code VARCHAR max    For MySql  alter table prg ar report colors add Text Color Code longtext   For Oracle  alter table prg ar report colors add Text Color Code CLOB

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The max length of a varchar is subject to the max row size in MySQL  which is 64KB  not counting BLOBs    VARCHAR 65535    However  note that the limit is lower if you use a multi-byte character set   VARCHAR 21844  CHARACTER SET utf8     Here are some examples   The maximum row size is 65535  but a varchar also includes a byte or two to encode the length of a given string  So you actually can t declare a varchar of the maximum row size  even if it s the only column in the table   mysql gt  CREATE TABLE foo   v VARCHAR 65534     ERROR 1118  42000   Row size too large  The maximum row size for the used table type  not counting BLOBs  is 65535  This includes storage overhead  check the manual  You have to change some columns to TEXT or BLOBs   But if we try decreasing lengths  we find the greatest length that works   mysql gt  CREATE TABLE foo   v VARCHAR 65532     Query OK  0 rows affected  0 01 sec    Now if we try to use a multibyte charset at the table level  we find that it counts each character as multiple bytes  UTF8 strings don t necessarily use multiple bytes per string  but MySQL can t assume you ll restrict all your future inserts to single-byte characters   mysql gt  CREATE TABLE foo   v VARCHAR 65532    CHARSET utf8  ERROR 1074  42000   Column length too big for column  v   max   21845   use BLOB or TEXT instead   In spite of what the last error told us  InnoDB still doesn t like a length of 21845   mysql gt  CREATE TABLE foo   v VARCHAR 21845    CHARSET utf8  ERROR 1118  42000   Row size too large  The maximum row size for the used table type  not counting BLOBs  is 65535  This includes storage overhead  check the manual  You have to change some columns to TEXT or BLOBs   This makes perfect sense  if you calculate that 21845 3   65535  which wouldn t have worked anyway  Whereas 21844 3   65532  which does work   mysql gt  CREATE TABLE foo   v VARCHAR 21844    CHARSET utf8  Query OK  0 rows affected  0 32 sec

User · Answer

The max length of a varchar is subject to the max row size in MySQL  which is 64KB  not counting BLOBs    VARCHAR 65535    However  note that the limit is lower if you use a multi-byte character set   VARCHAR 21844  CHARACTER SET utf8     Here are some examples   The maximum row size is 65535  but a varchar also includes a byte or two to encode the length of a given string  So you actually can t declare a varchar of the maximum row size  even if it s the only column in the table   mysql gt  CREATE TABLE foo   v VARCHAR 65534     ERROR 1118  42000   Row size too large  The maximum row size for the used table type  not counting BLOBs  is 65535  This includes storage overhead  check the manual  You have to change some columns to TEXT or BLOBs   But if we try decreasing lengths  we find the greatest length that works   mysql gt  CREATE TABLE foo   v VARCHAR 65532     Query OK  0 rows affected  0 01 sec    Now if we try to use a multibyte charset at the table level  we find that it counts each character as multiple bytes  UTF8 strings don t necessarily use multiple bytes per string  but MySQL can t assume you ll restrict all your future inserts to single-byte characters   mysql gt  CREATE TABLE foo   v VARCHAR 65532    CHARSET utf8  ERROR 1074  42000   Column length too big for column  v   max   21845   use BLOB or TEXT instead   In spite of what the last error told us  InnoDB still doesn t like a length of 21845   mysql gt  CREATE TABLE foo   v VARCHAR 21845    CHARSET utf8  ERROR 1118  42000   Row size too large  The maximum row size for the used table type  not counting BLOBs  is 65535  This includes storage overhead  check the manual  You have to change some columns to TEXT or BLOBs   This makes perfect sense  if you calculate that 21845 3   65535  which wouldn t have worked anyway  Whereas 21844 3   65532  which does work   mysql gt  CREATE TABLE foo   v VARCHAR 21844    CHARSET utf8  Query OK  0 rows affected  0 32 sec

User · Answer

TLDR  MySql does not have an equivalent concept of varchar max   this is a MS SQL Server feature  What is VARCHAR max   varchar max  is a feature of Microsoft SQL Server  The amount of data that a column could store in Microsoft SQL server versions prior to version 2005 was limited to 8KB   In order to store more than 8KB you would have to use TEXT  NTEXT  or BLOB columns types  these column types stored their data as a collection of 8K pages separate from the table data pages  they supported storing up to 2GB per row  The big caveat to these column types was that they usually required special functions and statements to access and modify the data  e g  READTEXT  WRITETEXT  and UPDATETEXT  In SQL Server 2005  varchar max  was introduced to unify the data and queries used to retrieve and modify data in large columns   The data for varchar max  columns is stored inline with the table data pages  As the data in the MAX column fills an 8KB data page an overflow page is allocated and the previous page points to it forming a linked list  Unlike TEXT  NTEXT  and BLOB the varchar max  column type supports all the same query semantics as other column types  So varchar MAX  really means varchar AS MUCH AS I WANT TO STUFF IN HERE JUST KEEP GROWING  and not varchar MAX SIZE OF A COLUMN   MySql does not have an equivalent idiom  In order to get the same amount of storage as a varchar max  in MySql you would still need to resort to a BLOB column type   This article discusses a very effective method of storing large amounts of data in MySql efficiently

User · Answer

The max length of a varchar is   65535  divided by the max byte length of a character in the character set the column is set to  e g  utf8 3 bytes  ucs2 2  latin1 1    minus 2 bytes to store the length  minus the length of all the other columns  minus 1 byte for every 8 columns that are nullable  If your column is null not null this gets stored as one bit in a byte bytes called the null mask  1 bit per column that is nullable

User · Answer

TLDR  MySql does not have an equivalent concept of varchar max   this is a MS SQL Server feature  What is VARCHAR max   varchar max  is a feature of Microsoft SQL Server  The amount of data that a column could store in Microsoft SQL server versions prior to version 2005 was limited to 8KB   In order to store more than 8KB you would have to use TEXT  NTEXT  or BLOB columns types  these column types stored their data as a collection of 8K pages separate from the table data pages  they supported storing up to 2GB per row  The big caveat to these column types was that they usually required special functions and statements to access and modify the data  e g  READTEXT  WRITETEXT  and UPDATETEXT  In SQL Server 2005  varchar max  was introduced to unify the data and queries used to retrieve and modify data in large columns   The data for varchar max  columns is stored inline with the table data pages  As the data in the MAX column fills an 8KB data page an overflow page is allocated and the previous page points to it forming a linked list  Unlike TEXT  NTEXT  and BLOB the varchar max  column type supports all the same query semantics as other column types  So varchar MAX  really means varchar AS MUCH AS I WANT TO STUFF IN HERE JUST KEEP GROWING  and not varchar MAX SIZE OF A COLUMN   MySql does not have an equivalent idiom  In order to get the same amount of storage as a varchar max  in MySql you would still need to resort to a BLOB column type   This article discusses a very effective method of storing large amounts of data in MySql efficiently

User · Answer

The max length of a varchar is   65535  divided by the max byte length of a character in the character set the column is set to  e g  utf8 3 bytes  ucs2 2  latin1 1    minus 2 bytes to store the length  minus the length of all the other columns  minus 1 byte for every 8 columns that are nullable  If your column is null not null this gets stored as one bit in a byte bytes called the null mask  1 bit per column that is nullable

User · Answer

For Sql Server  alter table prg ar report colors add Text Color Code VARCHAR max    For MySql  alter table prg ar report colors add Text Color Code longtext   For Oracle  alter table prg ar report colors add Text Color Code CLOB

[mysql] Equivalent of varchar(max) in MySQL?

What is VARCHAR(max)?

MySql does not have an equivalent idiom.

Examples related to mysql

Examples related to varchar