28.4.15 The INFORMATION_SCHEMA INNODB_FT_CONFIG Table

The INNODB_FT_CONFIG table provides metadata about the FULLTEXT index and associated processing for an InnoDB table.

This table is empty initially. Before querying it, set the value of the innodb_ft_aux_table system variable to the name (including the database name) of the table that contains the FULLTEXT index (for example, test/articles).

For related usage information and examples, see Section 17.15.4, “InnoDB INFORMATION_SCHEMA FULLTEXT Index Tables”.

The INNODB_FT_CONFIG table has these columns:

• KEY

  The name designating an item of metadata for an InnoDB table containing a FULLTEXT index.

  The values for this column might change, depending on the needs for performance tuning and debugging for InnoDB full-text processing. The key names and their meanings include:

  • optimize_checkpoint_limit: The number of seconds after which an OPTIMIZE TABLE run stops.

  • synced_doc_id: The next DOC_ID to be issued.

  • stopword_table_name: The database/table name for a user-defined stopword table. The VALUE column is empty if there is no user-defined stopword table.

  • use_stopword: Indicates whether a stopword table is used, which is defined when the FULLTEXT index is created.

• VALUE

  The value associated with the corresponding KEY column, reflecting some limit or current value for an aspect of a FULLTEXT index for an InnoDB table.

Example

mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_FT_CONFIG;
+---------------------------+-------------------+
| KEY                       | VALUE             |
+---------------------------+-------------------+
| optimize_checkpoint_limit | 180               |
| synced_doc_id             | 0                 |
| stopword_table_name       | test/my_stopwords |
| use_stopword              | 1                 |
+---------------------------+-------------------+

Notes

• This table is intended only for internal configuration. It is not intended for statistical information purposes.

• 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.

• For more information about InnoDB FULLTEXT search, see Section 17.6.2.4, “InnoDB Full-Text Indexes”, and Section 14.9, “Full-Text Search Functions”.