Information Schema INNODB_SYS_COLUMNS Table
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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