> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/server/reference/system-tables/performance-schema.md).

# Performance Schema

{% columns %}
{% column %}
{% content-ref url="/pages/8u0TJUD2YbrhU3fSRxrU" %}
[Performance Schema Digests](/docs/server/reference/system-tables/performance-schema/performance-schema-digests.md)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
Statement digests aggregate statistics for similar queries by removing specific data values, allowing you to identify performance patterns across statement types.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/f1DDjnL6PeiA4s4kqLVw" %}
[Performance Schema Overview](/docs/server/reference/system-tables/performance-schema/performance-schema-overview.md)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
The Performance Schema is a feature for monitoring server performance that inspects internal execution details at a low level with minimal overhead.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/hoh65GzHJBtkogg9E2bv" %}
[Performance Schema Status Variables](/docs/server/reference/system-tables/performance-schema/performance-schema-status-variables.md)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
This page lists status variables that track the internal health of the Performance Schema, such as counters for lost events due to memory constraints.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/hKVh55qGKzQ23bIvkdfd" %}
[Performance Schema System Variables](/docs/server/reference/system-tables/performance-schema/performance-schema-system-variables.md)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
Configure the Performance Schema using these system variables to control buffer sizes, set instrumentation limits, and enable specific consumers at startup.
{% endcolumn %}
{% endcolumns %}

{% columns %}
{% column %}
{% content-ref url="/pages/bPuYvlODdJEG6JiYfZSx" %}
[Performance Schema Tables](/docs/server/reference/system-tables/performance-schema/performance-schema-tables.md)
{% endcontent-ref %}
{% endcolumn %}

{% column %}
Explore the tables in the performance\_schema database, which expose granular metrics on server events, locks, threads, and I/O for detailed performance analysis.
{% endcolumn %}
{% endcolumns %}