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25.39.24 The INFORMATION_SCHEMA INNODB_TABLES Table
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 thelower_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
, andDB_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 aTRUNCATE 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
, orCompressed
).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, andSingle
for file-per-table tablespaces. Tables assigned to the system tablespace usingCREATE TABLE
orALTER TABLE
TABLESPACE=innodb_system
have aSPACE_TYPE
ofGeneral
. For more information, seeCREATE TABLESPACE
.INSTANT_COLS
The number of columns in the table prior to adding the first instant column using
ALTER TABLE ... ADD COLUMN
withALGORITHM=INSTANT
.
Example
- *************************** 1. row ***************************
- TABLE_ID: 214
- NAME: test/t1
- FLAG: 129
- N_COLS: 4
- SPACE: 233
- ROW_FORMAT: Compact
- ZIP_PAGE_SIZE: 0
- SPACE_TYPE: General
- INSTANT_COLS: 0
Notes
You must have the
PROCESS
privilege to query this table.Use the
INFORMATION_SCHEMA
COLUMNS
table or theSHOW COLUMNS
statement to view additional information about the columns of this table, including data types and default values.
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