PERFORMANCE_SCHEMA 存储引擎
如果您运行SHOW ENGINES命令，您将看到以下存储引擎列表。
SHOW ENGINES\G
...
Engine: PERFORMANCE_SCHEMA
Support: YES
Comment: Performance Schema
Transactions: NO
XA: NO
Savepoints: NO
...
PERFORMANCE_SCHEMA 不是用于存储数据的常规存储引擎，它是实现性能模式Performance Schema功能的机制。
还可以使用 SHOW ENGINE PERFORMANCE_SCHEMA STATUS 命令，该命令显示表和内部缓冲区使用的内存量。
有关详细信息，请参见 Performance Schema。
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