# PERFORMANCE\_SCHEMA

If you run [SHOW ENGINES](https://mariadb.com/docs/server/reference/sql-statements/administrative-sql-statements/show/show-engines), you'll see the following storage engine listed.

```sql
SHOW ENGINES\G
...
      Engine: PERFORMANCE_SCHEMA
     Support: YES
     Comment: Performance Schema
Transactions: NO
          XA: NO
  Savepoints: NO
...
```

The PERFORMANCE\_SCHEMA is not a regular storage engine for storing data, it's a mechanism for implementing the [Performance Schema](https://mariadb.com/docs/server/reference/system-tables/performance-schema) feature.

The [SHOW ENGINE PERFORMANCE\_SCHEMA STATUS](https://mariadb.com/docs/server/reference/sql-statements/administrative-sql-statements/show/show-engine#show-engine-performance_schema-status) statement is also available, which shows how much memory is used by the tables and internal buffers.

See [Performance Schema](https://mariadb.com/docs/server/reference/system-tables/performance-schema) for more details.

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