Coins Time Limit: 3000MS Memory Limit: 30000K Total Submissions: 32309 Accepted: 10986 Description People in Silverland use coins.They have coins of value A1,A2,A3...An Silverland dollar.One day Tony opened his money-box and found there were some…
对Oracle数据库整体性能的优化,首先要关注的是在有性能问题时数据库排名前几位等待事件是哪些.Oracle等待事件众多,随着版本的升级,数量还在不断增加,可以通过v$event_name查到当前数据库版本包含的等待事件.例如我在Linux平台查11.2.0.4版本的Oracle是有1367个等待事件.SELECT name FROM V$EVENT_NAME ORDER BY name; 如此多的等待事件自然是要分类汇总,并对常见的等待事件有比较深入的认识,才能在Oracle数据库调优这条路上…
Description Whuacmers use coins.They have coins of value A1,A2,A3...An Silverland dollar. One day Hibix opened purse and found there were some coins. He decided to buy a very nice watch in a nearby shop. He wanted to pay the exact price(without chang…
Coins Time Limit: 3000MS Memory Limit: 30000K Total Submissions: 34814 Accepted: 11828 Description People in Silverland use coins.They have coins of value A1,A2,A3...An Silverland dollar.One day Tony opened his money-box and found there were some…
Problem Description Whuacmers use coins.They have coins of value A1,A2,A3...An Silverland dollar. One day Hibix opened purse and found there were some coins. He decided to buy a very nice watch in a nearby shop. He wanted to pay the exact price(witho…
from http://www.akadia.com/services/ora_chained_rows.html Overview If you notice poor performance in your Oracle database Row Chaining and Migration may be one of several reasons, but we can prevent some of them by properly designing and/or diagnosin…
Binary Stirling Numbers Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 1761 Accepted: 671 Description The Stirling number of the second kind S(n, m) stands for the number of ways to partition a set of n things into m nonempty subsets.…