所有这些都与旧的设备兼容,只要只有一个权威的计时器;但随着城市的发展和时间信号的倍增,报时的差异导致了不和与冲突。
All this was compatible with older devices so long as there was only one authoritative timekeeper; but with urban growth and the multiplication of time signals, discrepancy brought discord and strife.
因为这与从非兼容浏览器中隐藏脚本的传统方式是相冲突的。
Because it interfered with the traditional way of hiding scripts from noncompatible browsers.
因此,如果统计数据不准确或者过期,或者冲突,优化器会对查询计划中各步骤的成本评估不准确,从而导致糟糕的性能。
Consequently, if the statistics are inaccurate, outdated, or conflicting, the optimizer will create inaccurate estimates for the costs of the steps in a query plan, leading to poor performance.
应用推荐