==> I'm a newbie in OrientDB :D

Is there any documentation regarding transactions, performance tuning and 
the Java API for graphs? The closest I got were some github issues, as it 
is a kind of bug. Some suggested to limit the number of records within the 
same commit. But it seems absurd to me, because this kind of action can 
potentially break the ACID properties. Actually I have, lets say, 30 XML 
files - big but not huge - that I'm interpreting to do import to OrientDB. 
I could just convert them to JSON, but I do some parsing to improve the 
design of the data, like creating edges. 
I got OutOfMemory many times.  First, I created an index to my natural id, 
which improved a lot the overall performance, but now I'm facing the 
outofmemory coming from commit operations. 
What's the proper way to delimit transactions? Another point is that I'm 
using the embedded mode(plocal). It's not necessary though, since I 
installed OrientDB in the same server. Is OrientDB really more powerful 
when running on server?
It would be very useful to create a more complex or real world tutorial and 
post on the website. I could even do so if I had the knowlege.
Thanks in advance!

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