Databases Reference
In-Depth Information
Figure 7-5
In the server's BIOS, you can turn hyper-threading on or off.
NUMA
Non-uniform memory access (NUMA) is a hardware design enhancement to better handle the ever
increasing load on your database servers.
In traditional symmetric multiprocessing (SMP) architecture, all memory usage by all available
processors is done through the shared system memory bus. This is sufficient when the load is not too
heavy on the database server system. However, as you try to scale things vertically, there could be
contention issues for system memory bus. The emergence of multi-core systems would only exacer-
bate this even further, with the existing shared memory bus architecture. NUMA can help reduce the
latency on the memory bus, especially for servers with more than 32 CPUs.
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