Documentation Home
MySQL 8.0 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 48.1Mb
PDF (A4) - 48.2Mb
PDF (RPM) - 43.8Mb
HTML Download (TGZ) - 11.0Mb
HTML Download (Zip) - 11.0Mb
HTML Download (RPM) - 9.7Mb
Man Pages (TGZ) - 239.8Kb
Man Pages (Zip) - 343.5Kb
Info (Gzip) - 4.4Mb
Info (Zip) - 4.4Mb
Excerpts from this Manual

MySQL 8.0 Reference Manual  /  INFORMATION_SCHEMA Tables  /  The INFORMATION_SCHEMA SCHEMATA_EXTENSIONS Table

25.31 The INFORMATION_SCHEMA SCHEMATA_EXTENSIONS Table

The SCHEMATA_EXTENSIONS table (available as of MySQL 8.0.22) augments the SCHEMATA table with information about schema options.

The SCHEMATA_EXTENSIONS table has these columns:

  • CATALOG_NAME

    The name of the catalog to which the schema belongs. This value is always def.

  • SCHEMA_NAME

    The name of the schema.

  • OPTIONS

    The options for the schema. If the schema is read only, the value contains READ ONLY=1. If the schema is not read only, no READ ONLY option appears.

Example

mysql> ALTER SCHEMA mydb READ ONLY = 1;
mysql> SELECT * FROM INFORMATION_SCHEMA.SCHEMATA_EXTENSIONS
       WHERE SCHEMA_NAME = 'mydb';
+--------------+-------------+-------------+
| CATALOG_NAME | SCHEMA_NAME | OPTIONS     |
+--------------+-------------+-------------+
| def          | mydb        | READ ONLY=1 |
+--------------+-------------+-------------+

mysql> ALTER SCHEMA mydb READ ONLY = 0;
mysql> SELECT * FROM INFORMATION_SCHEMA.SCHEMATA_EXTENSIONS
       WHERE SCHEMA_NAME = 'mydb';
+--------------+-------------+---------+
| CATALOG_NAME | SCHEMA_NAME | OPTIONS |
+--------------+-------------+---------+
| def          | mydb        |         |
+--------------+-------------+---------+

Notes