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MySQL 5.7 Reference Manual  /  ...  /  The INFORMATION_SCHEMA INNODB_SYS_FIELDS Table

22.31.18 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 Section 15.15.3, “InnoDB INFORMATION_SCHEMA System Tables”.

Table 22.18 INNODB_SYS_FIELDS Columns

Column nameDescription
INDEX_IDAn identifier for the index associated with this key field, using the same value as in INNODB_SYS_INDEXES.INDEX_ID.
NAMEThe name of the original column from the table, using the same value as in INNODB_SYS_COLUMNS.NAME.
POSThe 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:

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

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


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