provides token information about newly inserted rows in a
FULLTEXT index. To avoid expensive index
reorganization during DML operations, the information about newly
indexed words is stored separately, and combined with the main
search index only when
TABLE is run, when the server is shut down, or when the
cache size exceeds a limit defined by the
This table is empty initially. Before querying it, set the value
variable to the name (including the database name) of the table
that contains the
FULLTEXT index; for example
For related usage information and examples, see Section 14.16.4, “InnoDB INFORMATION_SCHEMA FULLTEXT Index Tables”.
INNODB_FT_INDEX_CACHE table has
A word extracted from the text of a newly inserted row.
The first document ID in which this word appears in the
The last document ID in which this word appears in the
The number of rows in which this word appears in the
FULLTEXTindex. The same word can occur several times within the cache table, once for each combination of
The document ID of the newly inserted row. This value might reflect the value of an ID column that you defined for the underlying table, or it can be a sequence value generated by
InnoDBwhen the table contains no suitable column.
The position of this particular instance of the word within the relevant document identified by the
DOC_IDvalue. The value does not represent an absolute position; it is an offset added to the
POSITIONof the previous instance of that word.
This table is empty initially. Before querying it, set the value of the
innodb_ft_aux_tablesystem variable to the name (including the database name) of the table that contains the
FULLTEXTindex; for example
test/articles. The following example demonstrates how to use the
innodb_ft_aux_tablesystem variable to show information about a
FULLTEXTindex for a specified table.
mysql> USE test; mysql> CREATE TABLE articles ( id INT UNSIGNED AUTO_INCREMENT NOT NULL PRIMARY KEY, title VARCHAR(200), body TEXT, FULLTEXT (title,body) ) ENGINE=InnoDB; mysql> INSERT INTO articles (title,body) VALUES ('MySQL Tutorial','DBMS stands for DataBase ...'), ('How To Use MySQL Well','After you went through a ...'), ('Optimizing MySQL','In this tutorial we show ...'), ('1001 MySQL Tricks','1. Never run mysqld as root. 2. ...'), ('MySQL vs. YourSQL','In the following database comparison ...'), ('MySQL Security','When configured properly, MySQL ...'); mysql> SET GLOBAL innodb_ft_aux_table = 'test/articles'; mysql> SELECT WORD, DOC_COUNT, DOC_ID, POSITION FROM INFORMATION_SCHEMA.INNODB_FT_INDEX_CACHE LIMIT 5; +------------+-----------+--------+----------+ | WORD | DOC_COUNT | DOC_ID | POSITION | +------------+-----------+--------+----------+ | 1001 | 1 | 4 | 0 | | after | 1 | 2 | 22 | | comparison | 1 | 5 | 44 | | configured | 1 | 6 | 20 | | database | 2 | 1 | 31 | +------------+-----------+--------+----------+
You must have the
PROCESSprivilege to query this table.
COLUMNStable or the
SHOW COLUMNSstatement to view additional information about the columns of this table, including data types and default values.
For more information about
FULLTEXTsearch, see Section 188.8.131.52, “InnoDB Full-Text Indexes”, and Section 12.9, “Full-Text Search Functions”.