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Kernighan's rule for optimizations (Don't do it) is good advice. But as with most rules, there are exceptions.

As CPU cores become both faster and more numerous, the limiting factor for most programs is now, and will be for some time, memory access. Hardware designers have come up with ever more sophisticated memory handling and acceleration techniques-such as CPU caches-but these cannot work optimally without some help from the programmer. Unfortunately, neither the structure nor the cost of using the memory subsystem of a computer or the caches on CPUs is well understood by most programmers. This paper explains the structure of memory subsys- tems in use on modern commodity hardware, illustrating why CPU caches were developed, how they work, and what programs should do to achieve optimal performance by utilizing them.

In this article you will learn about Columnstore index that is a new concept introduced in MSSQL server 2012 which stores data in columnar format.

PVS-Studio is a static analyzer that detects errors in source code of C/C++/C++11 applications. There are sets of rules included into PVS-Studio: General-purpose diagnosis Detection of possible optimizations Diagnosis of 64-bit errors (Viva64) Diagnosis of parallel errors (VivaMP)