On Mon, Sep 03, 2018 at 11:17:58AM +0300, Mariel Cherkassky wrote: > Hi, > I already checked and on all the tables that uses the id col of the main > table as a foreign key have index on that column. > > So, it seems that the second solution is the fastest one. It there a reason > why the delete chunks (solution 4) wasnt faster? I suggest running: SET track_io_timing=on; -- requires superuser explain(ANALYZE,BUFFERS) DELETE [...] https://wiki.postgresql.org/wiki/Slow_Query_Questions Maybe you just need larger shared_buffers ? Justin
