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事务等待快照可以列出数据库中，因锁等待而产生的事务等待信息。如果连接协调节点执行，将返回所有主数据节点的当前事务等待信息；如果连接主数据节点，将返回该节点的当前事务等待信息。
Note：
在输出结果中，每个事务等待信息为一条记录；如果节点未发生事务等待，则快照无输出信息。
SDB_SNAP_TRANSWAITS
| 字段名 | 类型 | 描述 |
|---|---|---|
| NodeName | string | 锁等待所处节点对应的节点名，格式为<主机名>:<服务名> |
| GroupID | int32 | 锁等待所处节点对应的分区组 ID |
| NodeID | int32 | 锁等待所处节点对应的节点 ID |
| WaitTime | int64 | 锁等待已耗费的时间，单位为毫秒 |
| WaiterTransID | string | 锁等待者事务 ID |
| HolderTransID | string | 锁持有者事务 ID |
| WaiterSessionID | int64 | 锁等待者事务所处节点的会话 ID |
| HolderSessionID | int64 | 锁持有者事务所处节点的会话 ID |
| WaiterTransCost | int64 | 锁等待者事务在本节点的日志空间消耗 |
| HolderTransCost | int64 | 锁持有者事务在本节点的日志空间消耗 |
| WaiterRelatedID | string | 锁等待者事务所在会话的内部标识 |
| HolderRelatedID | string | 锁持有者事务所在会话的内部标识 |
| WaiterRelatedGroupID | int32 | 发起锁等待者事务的会话所处节点对应的分区组 ID |
| HolderRelatedGroupID | int32 | 发起锁持有者事务的会话所处节点对应的分区组 ID |
| WaiterRelatedNodeID | int32 | 发起锁等待者事务的会话所处节点对应的节点 ID |
| HolderRelatedNodeID | int32 | 发起锁持有者事务的会话所处节点对应的节点 ID |
| WaiterRelatedSessionID | int64 | 发起锁等待者事务的会话所处节点对应的会话 ID |
| HolderRelatedSessionID | int64 | 发起锁持有者事务的会话所处节点对应的会话 ID |
查看事务等待快照
> db.snapshot(SDB_SNAP_TRANSWAITS)
输出结果如下：
{
"NodeName": "hostname1:20000",
"GroupID": 1000,
"NodeID": 1000,
"WaitTime": 8500,
"WaiterTransID": "0x00040010ffeafb",
"HolderTransID": "0x00040010ffeafd",
"WaiterTransCost": 0,
"HolderTransCost": 200,
"WaiterSessionID": 32,
"HolderSessionID": 28,
"WaiterRelatedID": "7f000101c3500000000000000011",
"HolderRelatedID": "7f000101c3500000000000000015",
"WaiterRelatedSessionID": 17,
"HolderRelatedSessionID": 21,
"WaiterRelatedGroupID": 2,
"HolderRelatedGroupID": 2,
"WaiterRelatedNodeID": 4,
"HolderRelatedNodeID": 4
}
{
"NodeName": "hostname1:20000",
"GroupID": 1000,
"NodeID": 1000,
"WaitTime": 6057,
"WaiterTransID": "0x00040010ffeafd",
"HolderTransID": "0x00040010ffeafa",
"WaiterTransCost": 200,
"HolderTransCost": 200,
"WaiterSessionID": 28,
"HolderSessionID": 25,
"WaiterRelatedID": "7f000101c3500000000000000015",
"HolderRelatedID": "7f000101c350000000000000000f",
"WaiterRelatedSessionID": 21,
"HolderRelatedSessionID": 15,
"WaiterRelatedGroupID": 2,
"HolderRelatedGroupID": 2,
"WaiterRelatedNodeID": 4,
"HolderRelatedNodeID": 4
}
{
"NodeName": "hostname1:42000",
"GroupID": 1001,
"NodeID": 1003,
"WaitTime": 10501,
"WaiterTransID": "0x00040010ffeafa",
"HolderTransID": "0x00040010ffeafb",
"WaiterTransCost": 0,
"HolderTransCost": 328,
"WaiterSessionID": 33,
"HolderSessionID": 26,
"WaiterRelatedID": "7f000101c350000000000000000f",
"HolderRelatedID": "7f000101c3500000000000000011",
"WaiterRelatedSessionID": 15,
"HolderRelatedSessionID": 17,
"WaiterRelatedGroupID": 2,
"HolderRelatedGroupID": 2,
"WaiterRelatedNodeID": 4,
"HolderRelatedNodeID": 4
}
{
"NodeName": "hostname1:42000",
"GroupID": 1001,
"NodeID": 1003,
"WaitTime": 7212,
"WaiterTransID": "0x00040010ffeafc",
"HolderTransID": "0x00040010ffeafb",
"WaiterTransCost": 200,
"HolderTransCost": 328,
"WaiterSessionID": 29,
"HolderSessionID": 26,
"WaiterRelatedID": "7f000101c3500000000000000013",
"HolderRelatedID": "7f000101c3500000000000000011",
"WaiterRelatedSessionID": 19,
"HolderRelatedSessionID": 17,
"WaiterRelatedGroupID": 2,
"HolderRelatedGroupID": 2,
"WaiterRelatedNodeID": 4,
"HolderRelatedNodeID": 4
}
{
"NodeName": "hostname1:42000",
"GroupID": 1001,
"NodeID": 1003,
"WaitTime": 6057,
"WaiterTransID": "0x00040010ffeafd",
"HolderTransID": "0x00040010ffeafc",
"WaiterTransCost": 0,
"HolderTransCost": 200,
"WaiterSessionID": 34,
"HolderSessionID": 29,
"WaiterRelatedID": "7f000101c3500000000000000015",
"HolderRelatedID": "7f000101c3500000000000000013",
"WaiterRelatedSessionID": 21,
"HolderRelatedSessionID": 19,
"WaiterRelatedGroupID": 2,
"HolderRelatedGroupID": 2,
"WaiterRelatedNodeID": 4,
"HolderRelatedNodeID": 4
}
Return 5 row(s).
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