Oh, and another point I forgot to mention, is that you'd need to increase checkpoint segments to get a longer time between checkpoints as well.
But honestly, do a search on the archives for tuning the background
writer, it's a much better option for most workloads.
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
