1.内存分配
（1）
the operating system, device drivers, and Teradata vprocs will initially use approximately 21 GB of memory of the 512 GB.
The default of 90% for FSG Cache Percent works for most 6xxx systems. 90% of GB (512 - 21) = 442 GB of FSG cache.
【Teradata System Use】How Teradata uses MPP Systems
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