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Showing content from https://mariadb.com/docs/server/server-usage/storage-engines/performance_schema-storage-engine below:

PERFORMANCE_SCHEMA | MariaDB Documentation

PERFORMANCE_SCHEMA | MariaDB Documentation
  1. Server Usage
  2. Storage Engines
PERFORMANCE_SCHEMA

If you run SHOW ENGINES, you'll see the following storage engine listed.

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 feature.

The 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 for more details.

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