Informix数据库blocked时，onstat命令显示的原因描述
Whenever the database server is blocked, onstat displays the following line after the banner line: Blocked: reason The variable reason can take one of the following values.
| Reason | Description |
|---|---|
| CKPT | Checkpoint |
| CKPT INP | Interval checkpoint in progress |
| LONGTX | Long transaction |
| ARCHIVE | Ongoing archive |
| MEDIA_FAILURE | Media failure |
| HANG_SYSTEM | Database server failure |
| DBS_DROP | Dropping a dbspace |
| DDR | Discrete high-availability data replication |
| LBU | Logs full high-watermark |
| ADMINISTRATION | Database is in administration mode |
