Hi Fan, The "recheckEvery" attribute does what you want [1]. However, that attribute only applies when using a scan element, which it doesn't seem like you're using. Right now, I think your only option is to periodically delete the aggregation cache directory [2], possibly in a crontab. There really ought to be a way to disable caching, but it's currently not possible. I've made an issue [3] for it though. Cheers, Christian [1] https://www.unidata.ucar.edu/software/thredds/current/netcdf-java/ncml/AnnotatedSchema4.html#aggregation [2] http://www.unidata.ucar.edu/software/thredds/current/tds/reference/ThreddsConfigXMLFile.html#Cache_Locations [3] https://github.com/Unidata/thredds/issues/863 Ticket Details =================== Ticket ID: GYQ-484919 Department: Support THREDDS Priority: High Status: Closed =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.