Just to expand a bit on the information already provided by @MHM Cisco World . . .
". . . opsf db of each router this consume memory and cpu,"
The mention of CPU is important, as OSPF computes routes, within an OSPF area, using Dijkstra’s shortest path algorithm, which, I recall, doesn't scale linearly as the area topology increases in size. (The impact can be so critical, in later OSPF implementations, Cisco has provided OSPF iSPF.)
"Add to that summay that can done in abr this reduce the opsf traffic in areas"
Also, it's the ABR that can minimize what's sent into the OSPF area, by defining the type of OSPF area, like a stub area.
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