Multiple vs. Single Database (Using BDB)

We have all our data in memory right now and are looking to move to disk in order to scale better. I am trying to see if BDB JE would help us with this. Obviously we want to store the data in such a way that it causes least possible IO at query time. Our query pattern is such that some properties of an object end up being accessed a lot more than others. Also some meta information about objects gets accessed very infrequently. I was thinking of separating out all information about objects and keep them in separate databases. For example Map<Property,Database> where Database is id->value. This obviously has the overhead of repeating the B-tree structure in each database but has the advantage of caching more frequently used properties and leaving out the infrequent ones. Possibly a better management of our memory space. Also not having to de-serialize all properties to just access a few can be a big advantage. If we keep all properties of the object together than some queries can potentially load most of the database in-memory. One other advantage I thought of keeping a database for each property is when we lookup a property for a set of objects the number of IOs would be less as they will be co-located on the same physical page. Sadly I realized that this is not true for log structure storage.
My main question is what is the overhead of having several databases and does caching only certain properties outweigh the overhead of repeating the B+-tree for each property.

Hello,
There is no way to answer that question accurately, since it depends completely on the query pattern and other resource usage. A realistic performance test is the only way to find out for sure. Also, whether de-serialization is a factor depends on whether the app is CPU bound.
But my general opinion is that a record per property will be very wasteful in terms of memory and disk, because the per-record overhead in JE is fairly high, and that will probably outweigh other possible advantages.
On another topic, if you don't need durability (you just want to overflow from memory onto disk) then I strongly suggest using temporary databases. See setTemporary in DatabaseConfig (if you're using the base API) or StoreConfig (if you're using the DPL).
--mark                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

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    input datafile file number=00007 name=/u01/oradata/HRCS90/adapp.dbf
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    input datafile file number=00074 name=/u01/oradata/HRCS90/hrsapp.dbf
    input datafile file number=00092 name=/u01/oradata/HRCS90/ptamsg.dbf
    input datafile file number=00056 name=/u01/oradata/HRCS90/fgapp.dbf
    input datafile file number=00114 name=/u01/oradata/HRCS90/stapp.dbf
    input datafile file number=00005 name=/u01/oradata/HRCS90/aaapp.dbf
    input datafile file number=00118 name=/u01/oradata/HRCS90/tllarge.dbf
    input datafile file number=00009 name=/u01/oradata/HRCS90/avapp.dbf
    input datafile file number=00065 name=/u01/oradata/HRCS90/hrapp2.dbf
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    RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
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