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25.39.24 The INFORMATION_SCHEMA INNODB_TABLES Table

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The INNODB_TABLES table provides metadata about InnoDB tables.

For related usage information and examples, see Section 15.14.3, “InnoDB INFORMATION_SCHEMA Schema Object Tables”.

The INNODB_TABLES table has these columns:

  • TABLE_ID

    An identifier for the InnoDB table. This value is unique across all databases in the instance.

  • NAME

    The name of the table, preceded by the schema (database) name where appropriate (for example, test/t1). Names of databases and user tables are in the same case as they were originally defined, possibly influenced by the lower_case_table_names setting.

  • FLAG

    A numeric value that represents bit-level information about table format and storage characteristics.

  • N_COLS

    The number of columns in the table. The number reported includes three hidden columns that are created by InnoDB (DB_ROW_ID, DB_TRX_ID, and DB_ROLL_PTR). The number reported also includes virtual generated columns, if present.

  • SPACE

    An identifier for the tablespace where the table resides. 0 means the InnoDB system tablespace. Any other number represents either a file-per-table tablespace or a general tablespace. This identifier stays the same after a TRUNCATE TABLE statement. For file-per-table tablespaces, this identifier is unique for tables across all databases in the instance.

  • ROW_FORMAT

    The table's row format (Compact, Redundant, Dynamic, or Compressed).

  • ZIP_PAGE_SIZE

    The zip page size. Applies only to tables with a row format of Compressed.

  • SPACE_TYPE

    The type of tablespace to which the table belongs. Possible values include System for the system tablespace, General for general tablespaces, and Single for file-per-table tablespaces. Tables assigned to the system tablespace using CREATE TABLE or ALTER TABLE TABLESPACE=innodb_system have a SPACE_TYPE of General. For more information, see CREATE TABLESPACE.

  • INSTANT_COLS

    The number of columns in the table prior to adding the first instant column using ALTER TABLE ... ADD COLUMN with ALGORITHM=INSTANT.

Example

  1. mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_TABLES WHERE TABLE_ID = 214\G
  2. *************************** 1. row ***************************
  3.      TABLE_ID: 214
  4.          NAME: test/t1
  5.          FLAG: 129
  6.        N_COLS: 4
  7.         SPACE: 233
  8.    ROW_FORMAT: Compact
  9. ZIP_PAGE_SIZE: 0
  10.    SPACE_TYPE: General
  11.  INSTANT_COLS: 0

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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.


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Document created the 26/06/2006, last modified the 26/10/2018
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