https://community.blueprism.com/t5/Product-Forum/Collections/m-p/60701#M14117 Hi All, How many data we can fetch in collections in a time any max limit is there? As per my requirement we have more than a laks of  rows data in the Excel, if I fetch via collections it get hanged and thrown an error €œStack empty€ pop up message.   Thanks       Tue, 27 Mar 2018 11:13:00 GMT Sundharpasuvaye 2018-03-27T11:13:00Z https://community.blueprism.com/t5/Product-Forum/Collections/m-p/60701#M14117 Hi All, How many data we can fetch in collections in a time any max limit is there? As per my requirement we have more than a laks of  rows data in the Excel, if I fetch via collections it get hanged and thrown an error €œStack empty€ pop up message.   Thanks       Tue, 27 Mar 2018 11:13:00 GMT https://community.blueprism.com/t5/Product-Forum/Collections/m-p/60701#M14117 Sundharpasuvaye 2018-03-27T11:13:00Z https://community.blueprism.com/t5/Product-Forum/Collections/m-p/60702#M14118 With My knowledge.... you can fecth maximum data in to excel sheets... If you want to process excel data with large amount number then You need to use QUEUE concepts.. --Naveen Tue, 27 Mar 2018 12:33:00 GMT https://community.blueprism.com/t5/Product-Forum/Collections/m-p/60702#M14118 NaveenG 2018-03-27T12:33:00Z https://community.blueprism.com/t5/Product-Forum/Collections/m-p/60703#M14119 Some of the main risks with enormous collections are 1) PC memory limit is reached, 2) excessive data logging and 3) a slow running process. If you have a giant Excel file then it might be better to consume it in a more efficient way, perhaps using an OLEDB query instead of opening the file and reading an entire sheet in one go. Tue, 27 Mar 2018 12:52:00 GMT https://community.blueprism.com/t5/Product-Forum/Collections/m-p/60703#M14119 John__Carter 2018-03-27T12:52:00Z