文章浏览阅读130次。上篇:电商数仓 第2节 基准测试1、 HDFS参数调优hdfs-site.xml(1)dfs.namenode.handler.count=20 * log2(Cluster Size),比如集群规模为8台时,此参数设置为60The number of Namenode RPC server threads that listen to requests from clients. If..._......
openssl req -new -out ./root.csr -key ./root.keyCan't load /root/.rnd into RNG140574087516608:error:2406F079:random number generator:RAND_load_file:Cannot open file:../crypto/rand/randfile.c:88:Filename=/root/.rndYou are about to be asked to enter infor_random number generator:rand_load_file:cannot ......
文章浏览阅读1k次。 http://www.w3school.com.cn/sql/sql_union.aspSQL UNION 和 UNION ALL 操作符SQL Full Join SQL Select IntoSQL UNION 操作符UNION 操作符用于合并两个或多个 SELECT 语句的结果集。请注意,UNION 内部的 SELECT 语句必须拥有相同数量的列。......
题目:解题思路:Python代码Java代码C++代码复杂度分析题目:Given an array of integers numbers that is already sorted in non-decreasing order, find two numbers such that they add up to a specific target number.Return the indices of the two numbers (1-indexed) as an integer arr._ja......