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The worst case of inconsistency happens when row X in database A is modified (by a Client connected to datacenter A), and the same row X in database B is independently modified too (by a Client connected to datacenter B).

Another Quote:

One way to avoid reports affecting operational DB, is via creating a read-only replica of our main operational DB – and running our reports off that replica.

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for larger-scale MOGs, functionality-wise it is common to have 4 different types of databases: transactional processing (OLTP) DBs, real-time reporting DBs, archive DBs, and analytical DBs (OLAP)

Another Quote:

both MVCC-based and Lock-based DBMS issue locks (and therefore, both can cause all kinds of trouble such as deadlocks etc.); however, the difference lies with the number of locks issued by them.

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Each server is only as secure as its admin

Another Quote:

For cheaper servers, the difference between Windows and Linux can eat as much as 50% of the server rental price (though for those servers which are more or less optimal price-performance-wise observed difference was closer to 20-30%).

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To have a good concurrency model, it is not strictly necessary to program in Erlang

Another Quote:

Most of developers agree that FSM-based programming is beneficial in the medium- to long-run.