Understanding loading mechanism

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If I use IFBTree ( integer-keyed float-valued BTree) to store some time 
series data. How does the loading work? For example, if  l want to load the 
entire time series into memory, how many trips happen between the client 
and server? In the document, it says it uses lazy loading.  Does it mean 
each key value pair is loaded from the db to memory one at a time?

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<div dir=3D"ltr">If I use IFBTree ( integer-keyed float-valued BTree) to st=
ore some time series data. How does the loading work? For example, if =C2=
=A0l want to load the entire time series into memory, how many trips happen=
 between the client and server? In the document, it says it uses lazy loadi=
ng. =C2=A0Does it mean each key value pair is loaded from the db to memory =
one at a time?</div>

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