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MySQL Information Schema  /  INFORMATION_SCHEMA InnoDB Tables  /  The INFORMATION_SCHEMA INNODB_SYS_FIELDS Table

5.19 The INFORMATION_SCHEMA INNODB_SYS_FIELDS Table

The INNODB_SYS_FIELDS table provides metadata about the key columns (fields) of InnoDB indexes, equivalent to the information from the SYS_FIELDS table in the InnoDB data dictionary.

For related usage information and examples, see InnoDB INFORMATION_SCHEMA System Tables.

The INNODB_SYS_FIELDS table has these columns:

  • INDEX_ID

    An identifier for the index associated with this key field; the same value as INNODB_SYS_INDEXES.INDEX_ID.

  • NAME

    The name of the original column from the table; the same value as INNODB_SYS_COLUMNS.NAME.

  • POS

    The ordinal position of the key field within the index, starting from 0 and incrementing sequentially. When a column is dropped, the remaining columns are reordered so that the sequence has no gaps.

Example

mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FIELDS WHERE INDEX_ID = 117\G
*************************** 1. row ***************************
INDEX_ID: 117
    NAME: col1
     POS: 0

Notes

  • You must have the PROCESS privilege to query this table.

  • Use the INFORMATION_SCHEMA COLUMNS table or the SHOW COLUMNS statement to view additional information about the columns of this table, including data types and default values.