If available RAM is approaching zero at any time during load, your system performance is limited by RAM.
如果可用RAM在任何时刻接近零，则系统性能将受到RAM的限制。
2
The lines shown in Listing 1 tell PHP to load the Zero extensions.
清单 1 中的代码行让 PHP 装载 Zero 扩展。
3
For example, if after a load all the data is on one partition and runstats is executed from another partition, it will update syscat.tables to show zero rows for that table.