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hey everybody Welcome to the next video and in this video well be talking about the difference between copy on write and merge on read when it comes to how your row level operations work so what does this mean um what happens when you update or delete a row how is that handled by the query engine in the Apache Iceberg table format youre gonna have two options copy on write and bergon reads lets talk a little bit about what these two things mean so first you have copy and write and the way copy on write Works which is the default so generally all your tables are always going to start off with copy on write by default It generally means that any data file where like even one record gets updated or deleted is going to result in that data file being Rewritten because again in in uh iceberg nothing ever gets edited youre never editing a file that already existed so what youll do is youll create a new data file so youll rewrite all the records that previously existed minus the record