为方便用户使用和维护DRDS，DRDS提供自己特有的管理命令语句。
管理命令语句是统一由udal开头的特殊SQL语句，DRDS特有的管理命令详见下表：
| Show Command | Description |
|---|---|
| UDAL SHOW HELP | show udal commands |
| UDAL SHOW VERSION | Report DBProxy Server version |
| UDAL SHOW SERVER | Report server status |
| UDAL SHOW DATASOURCE [ WHERE DATANODE = 'datanode' ] | Report dataSources |
| UDAL SHOW THREADPOOL | Report threadPool status |
| UDAL SHOW PROCESSOR | Report processor status |
| UDAL SHOW COMMAND | Report commands status |
| UDAL SHOW CACHE | Report system cache usage |
| UDAL SHOW BACKEND [ COUNT ] | Report backend connection status |
| UDAL SHOW FRONTEND [ COUNT ] | Report front connection status |
| UDAL SHOW SESSION | show session info with connection binding |
| UDAL SHOW HEARTBEAT | Report heartbeat status |
| UDAL SHOW SEQUENCE [ WHERE SCHEMA = 'sequence' AND SEQUENCE = 'schema' ] | sequenceServer sequenceInfo monitor |
| UDAL SHOW CONFIG WRITEHOST [ WHERE DATANODE IN ( 'datanode_list' , ... ) ] | udal show writehost info |
| UDAL SHOW CONFIG TABLENODE [ WHERE TABLENAME IN ( 'tablename_list' , ... ) ] | udal show tableNode info |
| UDAL SHOW CONFIG DATANODE [WHERE SCHEMA = 'schema'] | Report dataNodes |
| UDAL SHOW CONFIG GRANTS WHERE USER = 'user' | Report user's privileges |
| UDAL SHOW SEQUENCE [ SCHEMA ] | sequenceServer sequenceInfo monitor |
| UDAL SHOW LOCKS | show locks for current dbproxy cluster |
| UDAL SHOW METRIC SQL { SLOW / TPS} | show statistic of sql |
| UDAL SHOW CONFIG METRIC | show config of metric |
| UDAL SHOW TOP 10 | udal show top 10 [ALL / SLOW / BROADCAST] |
| Set Command | Description |
|---|---|
| UDAL SET MONITOR 'status' | set monitor status |
| UDAL SET SEQUENCE VALUE = 'value' WHERE SCHEMA = 'schema' AND SEQUENCE = 'sequence' | set sequence value |
| Dt Command | Description |
|---|---|
| UDAL DT SHOW COMPENSATION WHERE COMPENSATION_ID [= or LIKE] XXX | |
| UDAL DT SHOW LOCK WHERE COMPENSATION_ID [= or LIKE] XXX | |
| UDAL DT SHOW BKLOCK WHERE COMPENSATION_ID [= or LIKE] XXX | |
| UDAL DT DELETE COMPENSATION WHERE COMPENSATION_ID [= or LIKE] XXX | |
| UDAL DT DELETE LOCK WHERE COMPENSATION_ID [= or LIKE] XXX | |
| UDAL DT DELETE BKLOCK WHERE COMPENSATION_ID [= or LIKE] XXX |
| Common Command | Description |
|---|---|
| UDAL KILL CONNECTION 'connection_ids' ... | kill connection |
| UDAL STOP HEARTBEAT 'datanodes' ... FOR 'period' | stop heartbeat for a time |
| UDAL SWITCH DATASOURCE 'datanodes' ... [ TO 'index' ] | switch datasource |
| UDAL VALIDATE SEQUENCE WHERE SCHEMA = 'schema' AND SEQUENCE = 'sequence' | validate sequence |
| UDAL LOCK DATANODE '?' [WRITE/READ] | lock datanode for dbproxy cluster |
| UDAL LOCK TABLE '?' [WRITE/READ] | lock table for dbproxy cluster |
| UDAL UNLOCK TABLE '?' | unlock table for dbproxy cluster |
| UDAL UNLOCK DATANODE '?' | unlock datanode for dbproxy cluster |
