Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

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oren@ravendb.net

+972 52-548-6969

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Couchbase vs RavenDB Performance at Rakuten Kobo Whitepaper

Apr 05 2006

You really shouldn't write your own O/RM

time to read 2 min | 249 words

You do not have the resources to do as effectively as the existing tools in most scenarios. There is a reason that Nhibernate got over 100,000 Lines of Code. The simplest O/RM is just mapping from columns to properties. This is repetetive work that can be done by a code generation tool easily.

Then you realize that you need:

Transactions
Concurrency Control
Caching
Handling of associations between objects - This is a can of worms all by itself, there are quite a few of those, and you are likely to want to use all of them.

The above are the bare neccecities for an O/RM or a Data Mapper layer. I got problems with them because they are:

Not trivial
Solved problems

And then we didn't mentioned performance. I got a list of 25 bullet points of different (sometimes overlapping) features that I am using in NHibernate right now. None of them are esoteric by any mean. It's not a weekend project, not if you are going to do it right.

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RECENT COMMENTS

Dmitry, Yes, but this is _known_ to be a 64 bits system - since we are allocating 3GB (not possible in 64 bits). Note t...

By Oren Eini on Answer: What does this code do?
That's why it is a good idea to compare the return value of `write` to the buffer size. "size_t" can be 32-bit on some system...

By Dmitry on Answer: What does this code do?
There's a reason we miss `write_exact` and `read_exact` from the standard library. In fact, I am surprised the chunk is actua...

By Pyth0n on Challenge: What does this code do?
kpvleeuwen, I agree, unfortunately I don't have anyone to ask off the top of my head. Thanks, I fixed the headers.

By Oren Eini on Performance discovery: IOPS vs. IOPS
It could be interesting to reach out to storage firmware developers and ask what write patterns they think would be useful ex...

By kpvleeuwen on Performance discovery: IOPS vs. IOPS

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