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MySQL Information Schema  /  INFORMATION_SCHEMA InnoDB Tables  /  The INFORMATION_SCHEMA INNODB_SYS_TABLES Table

5.23 The INFORMATION_SCHEMA INNODB_SYS_TABLES Table

The INNODB_SYS_TABLES table provides metadata about InnoDB tables, equivalent to the information from the SYS_TABLES table in the InnoDB data dictionary.

For related usage information and examples, see InnoDB INFORMATION_SCHEMA System Tables.

The INNODB_SYS_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).

  • SPACE

    An identifier for the tablespace where the table resides. 0 means the InnoDB system tablespace. Any other number represents a table created in file-per-table mode with a separate .ibd file. This identifier stays the same after a TRUNCATE TABLE statement. Other than the zero value, this identifier is unique for tables across all the databases in the instance.

  • FILE_FORMAT

    The table's file format (Antelope or Barracuda).

  • 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.

Example

mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES WHERE TABLE_ID = 74\G
*************************** 1. row ***************************
     TABLE_ID: 74
         NAME: test/t1
         FLAG: 1
       N_COLS: 6
        SPACE: 60
  FILE_FORMAT: Antelope
   ROW_FORMAT: Compact
ZIP_PAGE_SIZE: 0

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.