database scalability - opening vs. database size


i'm formulating an app have put during max 32 gb information database. i am controlling b-tree indexing since reads have operation queries (like 0 < < 1hr).



at commencement (database distance = 0gb), i 60 70 writes per millisecond. after contend 5gb, 3 databases i've tested (h2, berkeley db, sybase sql anywhere) have unequivocally slowed down underneath 5 writes per millisecond.



questions:




  • is typical?

  • would i still scalability emanate i private indexing?

  • what causes problem?



notes:



each record consists few ints



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