UNDO_RETENTION The undo_retention is a initialization parameter of the undo tablespace. The initialization parameter of undo_retention used to control the maximum data retention time, the undo_retention default value is 900 seconds. The undo_retentio…

reference: https://www.akadia.com/services/ora_optimize_undo.html#:~:text=Turning%20on%20automatic%20undo%20management,tablespace%20and%20set%20UNDO_MANAGEMENT%20%3D%20AUTO.&text=You%20can%20choose%20to%20allocate,size%20and%20the%20database%20activi…

Calculate the Distance Between Two Points in PHP There are a lot of applications where it is useful to know the distance between two coordinates. Here, you'll find a PHP function that takes the latitude and longitude of two points and returns the dis…

CoreException: Could not calculate build plan: Plugin org.apache.maven.plugins:maven-compiler-plugin:3.1 or one of its dependencies could not be resolved: Failure to find org.apache.maven.plugins:maven-compiler-plugin:jar:3.1 in http://repository.jbo…

错误提示如下:(eclipse+maven) Could not calculate build plan: Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.7.1 from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the up…

Calculate the Function Problem's Link:   http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3772 Mean: 略 analyse: 简单的线段树维护矩阵. 矩阵乘法的结合律(a * b * c == a * (b * c)),注意矩阵乘法不满足分配率(a *b != b * a). 令 M[x] = [1 A[x]]              [1     0 ] ,那么有 [ F…

u Calculate e Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 28686    Accepted Submission(s): 12762 Problem Description A simple mathematical formula for e is where n is allowed to go to infini…

COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION A common unit of measure for failure rates of electronic components is the Failure un IT (FIT), expressed as a rate of failures per billion device hours. Another well know…

u Calculate e Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 35137 Accepted Submission(s): 15824 Problem Description A simple mathematical formula for e is where n is allowed to go to infinity. T…

Peter wrote a post a while ago about choosing a good InnoDB log file size.  Not to pick on Peter, but the post actually kind of talks about a lot of things and then doesn’t tell you how to choose a good log file size!  So I thought I’d clarify it a…

Problem Description You just need to calculate the sum of the formula: 1^2+3^2+5^2+……+ n ^2.   Input In each case, there is an odd positive integer n.   Output Print the sum. Make sure the sum will not exceed 2^31-1   Sample Input 3   Sample Output 1…

Do you need to find the difference in number of days, hours or even minute between the two date range? Here's how: Assuming the a and b variable is of type DateTime object. DateTime a = DateTime.Now;DateTime b = DateTime.Now(b - a).TotalDays Example:…

u Calculate e Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 19465   Accepted: 11362   Special Judge Description A simple mathematical formula for e is e=Σ0<=i<=n1/i!where n is allowed to go to infinity. This can actually yield very ac…

calculate age based on date of birth know one new webiste:eval.in run php code…

u Calculate e Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 37350    Accepted Submission(s): 16905 Problem Description A simple mathematical formula for e is where n is allowed to go to infini…

Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.5 or one of its dependencies could not be resolved   此问题的解决:   1.要确认spring sts已经设置代理 2.要确认windows -> Preferences -> maven 的settings.xml文件中,设置代理. 3.C:\Users\ttt\…

refer to: http://www.stealthcopter.com/blog/2009/09/python-calculating-pi-using-random-numbers/ During my undergraduate degree I wrote a program in fortran 95 to calculate pi using random numbers. My aim is to rewrite it efficiently in python. I know…

u Calculate e Problem Description A simple mathematical formula for e is where n is allowed to go to infinity. This can actually yield very accurate approximations of e using relatively small values of n.   Output Output the approximations of e gener…

Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) 看到这个时间,我懵逼了... 果然,Java就是打表,都不能AC,因为Java的输入是流,需要的时间比C真的长好多.... Problem Description You just need to calculate the sum of the formula: 1^2+3^2+5^2+--+ n ^2. Input In each…

Problem Description Calculate S(n). S(n)=1^3+2^3 +3^3 +--+n^3 . Input Each line will contain one integer N(1 < n < 1000000000). Process to end of file. Output For each case, output the last four dights of S(N) in one line. Sample Input 1 2 Sample Ou…

Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6 解决方法: 删除maven库…

Question 1 1 1 1 1 01 0 1 0 0 11 0 1 0 0 11 1 0 1 1 1 1 is earth, 0 is water. i) count the number of 'islands' that the matrix has.ii) count the number of 'lakes' that the matrix has i.e. connected clump of zeros that is entirely surrounded by a sing…

Calculate S(n) Time Limit: 10000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 9102    Accepted Submission(s): 3325 Problem Description Calculate S(n). S(n)=13+23 +33 +......+n3 .   Input Each line will contai…

使用下面的公式来计算undo_retention参数的值: undo_retention=undo size/(db_block_size * undo_block_per_sec) 可以通过提交下面的查询来计算数据库中实际产生的撤销数据: sys@ORCL> select sum(d.bytes) "undo" 2    from v$datafile d, v$tablespace t, dba_tablespaces s 3   where s.contents = 'UN…

昨天,一个朋友的数据库数据被误操作删除掉了,请求我帮忙进行恢复. 数据库版本是Oracle10g Release 2的,我首先想到的是使用Flashback Query进行闪回恢复,不幸的是ORA-01555,数据已经不能被闪回了. 查看当时的数据库参数undo_retention设置,发现这个参数被在10g中缺省的被设置为900秒,这个时间长度是不足够的. 马上将这个参数修改为10800,3个小时: ALTER SYSTEM SET undo_retention=10800 SCOPE=BOT…

u Calculate e Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 46844    Accepted Submission(s): 21489 Problem Description A simple mathematical formula for e is where n is allowed to go to infini…

Could not calculate build plan: Plugin org.apache.maven.plugins:maven-war-plugin:2.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-war-plugin:jar:2.2 Plugin org.apache.maven.pl…

What is a good solution for calculating an average where the sum of all values exceeds a double's limits? According to the highest vote in: http://stackoverflow.com/questions/1930454/what-is-a-good-solution-for-calculating-an-average-where-the-sum-of…

使用maven创建简单的项目时候经常会遇到 Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:…

sklearn实战-乳腺癌细胞数据挖掘(博客主亲自录制视频教程) https://study.163.com/course/introduction.htm?courseId=1005269003&utm_campaign=commission&utm_source=cp-400000000398149&utm_medium=share     # -*- coding: utf-8 -*- ''' python入门/爬虫/人工智能/机器学习/自然语言/数据统计分析视频教程网址 h…