# System Tables

The MariaDB Server includes several system tables that store metadata about database objects, user privileges, and server status.

{% columns %}
{% column %}
{% content-ref url="system-tables/information-schema" %}
[information-schema](https://mariadb.com/docs/server/reference/system-tables/information-schema)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
The `information_schema` is a standard-compliant database that provides information about all other databases, tables, and columns on the server.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="system-tables/performance-schema" %}
[performance-schema](https://mariadb.com/docs/server/reference/system-tables/performance-schema)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
The `performance_schema` allows you to monitor server execution at a low level with minimal impact on performance.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="system-tables/sys-schema" %}
[sys-schema](https://mariadb.com/docs/server/reference/system-tables/sys-schema)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
The `sys` schema contains a collection of views, procedures, and functions that simplify the interpretation of data from the `performance_schema`.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="system-tables/the-mysql-database-tables" %}
[the-mysql-database-tables](https://mariadb.com/docs/server/reference/system-tables/the-mysql-database-tables)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
Contains the core system tables in the `mysql` database, including privilege tables, logging tables, and status variables.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="broken-reference" %}
[Broken link](https://mariadb.com/docs/server/reference/broken-reference)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
The `mariadb_schema` table stores information regarding the database schema versions and migration history.
{% endcolumn %}
{% endcolumns %}