data distribution path

基本解釋

Without column data-value distribution information in the catalog, DB2 will assume an even distribution of values, which may lead the optimizer to a sub-optimal access path.
如果編目中沒(méi)有列數(shù)據(jù)值分布信息，DB2 就會(huì)假設(shè)值是均勻分布的，這可能導(dǎo)致優(yōu)化器選擇非最優(yōu)的訪問(wèn)路徑。
Without correct column distribution statistics, DB2 may not have enough information to make the best choice when choosing an access path to the data—especially if data is heavily skewed.
在選擇數(shù)據(jù)的訪問(wèn)路徑時(shí)，如果沒(méi)有正確的列分布統(tǒng)計(jì)數(shù)據(jù)，DB2 可能沒(méi)有足夠的信息來(lái)做出最佳的選擇，尤其是如果數(shù)據(jù)出現(xiàn)嚴(yán)重誤差。