You have also examined how the use of parameter markers/host variables may limit the consideration of distribution statistics by the DB2 optimizer.
您还研究了参数标记/主变量的使用会为 DB2 优化器对分布统计信息的考虑带来怎样的限制。
2
On distribution roads, where side impacts are likely - when a car might ram into the side of another that is pulling out of a side road, for instance - the limit should be 30mph (50kph).