Question about Maintain snapshot information

Hi Experts

I have two node (AP node and DB node ) EBS 11.5.9 environment.

I run adadmin->Maintain snapshot information ,

I found in DB node, It cost 20 min,but in AP node, It only cost 2 min

and no error messages in the log files,

the difference of the two logs is

in the log file for DB node,there are so many such messages,and It cost much time

[Reading: Product = "<module short name>", Directory = "XXXX" ]

in the log file for AP node,no such messages.

Could you tell me why the time is different for the two nodes.

and why the above messages are not exist in the log for AP node?