ENGINES
ENGINES表提供了关于存储引擎的信息。当你需要检查 GreptimeDB 是否支持某个存储引擎或者查看默认的存储引擎时，该表非常有用。
ENGINES表包含以下列：
engine：存储引擎名称。support：存储引擎的支持级别：
| 值 | 含义 |
|---|---|
YES | 支持且在使用中 |
DEFAULT | 支持且在使用中，且是默认的存储引擎 |
NO | 不支持 |
DISABLED | 支持但已被禁用 |
comment：存储引擎的简要描述。transactions：存储引擎是否支持事务。xa：存储引擎是否支持 XA 事务。savepoints：存储引擎是否支持保存点。
例如：
sql
SELECT * from INFORMATION_SCHEMA.ENGINES\GSELECT * from INFORMATION_SCHEMA.ENGINES\G结果如下：
sql
*************************** 1. row ***************************
engine: mito
support: DEFAULT
comment: Storage engine for time-series data
transactions: NO
xa: NO
savepoints: NO
*************************** 2. row ***************************
engine: metric
support: YES
comment: Storage engine for observability scenarios, which is adept at handling a large number of small tables, making it particularly suitable for cloud-native monitoring
transactions: NO
xa: NO
savepoints: NO*************************** 1. row ***************************
engine: mito
support: DEFAULT
comment: Storage engine for time-series data
transactions: NO
xa: NO
savepoints: NO
*************************** 2. row ***************************
engine: metric
support: YES
comment: Storage engine for observability scenarios, which is adept at handling a large number of small tables, making it particularly suitable for cloud-native monitoring
transactions: NO
xa: NO
savepoints: NO