Peter Eisentraut wrote: > Bruce Momjian wrote: > > This patch disables page writes to WAL when fsync is off, because > > with no fsync guarantee, the page write recovery isn't useful. > > > > This also adds a full_page_writes GUC to turn off page writes to WAL. > > Some people might not want full_page_writes, but still might want > > fsync. > > Do you have some numbers to suggest that there is a performance benefit > to be had?
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Josh reported page writes to be a big hit (which we already knew), but I don't have any with fsync off, though it seems like a no-brainer. However, I am thinking decoupling them is best. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- 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
