Hi. Thanks. There is an index and I tried adding index rebuild code in there too to resolve it. These tables use some tables with 2.5bn records each, and the final table it's building will be 1.8bn records. I don't think this is the issue though as it occurs on the smaller middle tables too. Once it's in the main large table it performs fine when reading. Though I don't know if/when I'll hit some update limit in the main table either.