如果提交请求以后，状态一直是pending状态，可以在“工具”打开“Manager”，查看一下Maximum是否有设置错,另外pending的数量当前是多少。
如果Maximum是1，pending是18，则在排队的状态，需要等待前面的request执行完。或者请DBA帮忙处理。
也可以进入System administrator职责，找到Concurrent->Manager->Administer，找到pending的那个request， 点击“request”按钮查看明细。
点击“Diagnostics”查看log，一般会有说明正在等待哪个request。如：
This request may have to wait on one or more of the following requests to complete before it can begin execution:
29732300 - This request is incompatible with request 29734982.
29734427 - This request is incompatible with request 29734982.
29734427 - This request is incompatible with request 29734982.