Why the applied_scn can not increase?

I use the Oracle stream while I find the change of the source databse can apply in the remote database,but the applied_scn can not increase for a long time after the change has success.If this scn can not increase,I can not delete some logfile,which may be full of my disk one day.
Who has suggestion?

you say you want delete some logfile , destination's logfile , is it right ?
i think that's no problem because the change of LCR is kept in Stream Queue but not in logfile. that means you can drop some archivelog as you want. it dosn't matter! :)

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