Information Schema INNODB_SYS_COLUMNS Table

The INNODB_SYS_COLUMNS table contains metadata about InnoDB table columns, derived directly from the internal InnoDB data dictionary.

The Information Schema INNODB_SYS_COLUMNS table contains information about InnoDB fields.

The PROCESS privilege is required to view the table.

It has the following columns:

Column	Description
TABLE_ID	Table identifier, matching the value from INNODB_SYS_TABLES.TABLE_ID.
NAME	Column name.
POS	Ordinal position of the column in the table, starting from 0. This value is adjusted when columns are added or removed.
MTYPE	Numeric column type identifier, (see the table below for an explanation of its values).
PRTYPE	Binary value of the InnoDB precise type, representing the data type, character set code and nullability.
LEN	Column length. For multi-byte character sets, represents the length in bytes.

The column MTYPE uses a numeric column type identifier, which has the following values:

Column Type Identifier	Description
1	VARCHAR
2	CHAR
3	FIXBINARY
4	BINARY
5	BLOB
6	INT
7	SYS_CHILD
8	SYS
9	FLOAT
10	DOUBLE
11	DECIMAL
12	VARMYSQL
13	MYSQL

Example

SELECT * FROM information_schema.INNODB_SYS_COLUMNS LIMIT 3\G
*************************** 1. row ***************************
TABLE_ID: 11
    NAME: ID
     POS: 0
   MTYPE: 1
  PRTYPE: 524292
     LEN: 0
*************************** 2. row ***************************
TABLE_ID: 11
    NAME: FOR_NAME 
     POS: 0
   MTYPE: 1
  PRTYPE: 524292
    LEN: 0
*************************** 3. row ***************************
TABLE_ID: 11
    NAME: REF_NAME 
     POS: 0
   MTYPE: 1
  PRTYPE: 524292
     LEN: 0
3 rows in set (0.00 sec)

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