MySQL 8.4 Release Notes
28.4.17 INFORMATION_SCHEMA INNODB_FT_DELETED 表
The INNODB_FT_DELETED table stores rows that are deleted from the FULLTEXT index for an InnoDB table. To avoid expensive index reorganization during DML operations for an InnoDB FULLTEXT index, the information about newly deleted words is stored separately, filtered out of search results when you do a text search, and removed from the main search index only when you issue an OPTIMIZE TABLE statement for the InnoDB table. For more information, see Optimizing InnoDB Full-Text Indexes.
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_DELETED table has these columns:
-
DOC_IDThe document ID of the newly deleted 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. This value is used when you perform text searches, to skip rows in theINNODB_FT_INDEX_TABLEtable before data for deleted rows is physically removed from theFULLTEXTindex by anOPTIMIZE TABLEstatement. For more information, see Optimizing InnoDB Full-Text Indexes.
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_FT_DELETED;
+--------+
| DOC_ID |
+--------+
| 6 |
| 7 |
| 8 |
+--------+-
You must have the
PROCESSprivilege to query this table. -
Use the
INFORMATION_SCHEMACOLUMNStable or theSHOW COLUMNSstatement to view additional information about the columns of this table, including data types and default values. -
For more information about
InnoDBFULLTEXTsearch, see Section 17.6.2.4, “InnoDB Full-Text Indexes”, and Section 14.9, “Full-Text Search Functions”.