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在recover database时,如何决定该从哪一个SCN开始恢复
使用备份恢复的方法搭建DG库,还原数据文件后,打开数据库时报错 SQL> ALTER DATABASE OPEN READ ONLY; ALTER DATABASE OPEN READ ONLY * ERROR at line 1: ORA-10458: standby database requi ...
分类:数据库   时间:2020-07-03 15:48:15    阅读次数:103
Ubuntu 指定默认启动内核
版本:Ubuntu 18.04 可以通过开机启动Ubuntu时按 ESC 键来进入GRUB选项, 选择 Advanced options for Ubuntu,然后可以看到所有内核启动菜单,Index从0开始。 或者输入以下命令: wayde@wayde-desktop:~$ cat /boot/g ...
分类:系统相关   时间:2020-07-03 12:47:16    阅读次数:79
485. Max Consecutive Ones
Given a binary array, find the maximum number of consecutive 1s in this array. Example 1: Input: [1,1,0,1,1,1] Output: 3 Explanation: The first two di ...
分类:其他好文   时间:2020-07-02 23:22:50    阅读次数:99
PAT 1045 Favorite Color Stripe (30分) 动态规划
题目 Eva is trying to make her own color stripe out of a given one. She would like to keep only her favorite colors in her favorite order by cutting off ...
分类:其他好文   时间:2020-07-02 19:53:26    阅读次数:70
给字符排序-基类排序二分查找-JavaScript
//比较字符基类大小 相同返回0,str1>str2 返回1,str1<str2 返回-1, function str_compare(str1,str2){ let index=0; let dis=0; while (dis 0&&index<str1.length){ if(str1.char ...
分类:编程语言   时间:2020-07-01 20:32:24    阅读次数:61
redmine 的微软邮箱配置
配置文件地址: /usr/src/redmine/config/configuration.yml # = Redmine configuration file # # Each environment has its own configuration options. If you are on ...
分类:其他好文   时间:2020-07-01 20:11:49    阅读次数:60
Linux chattr 命令详解
常见命令参数 1 2 3 4 5 6 7 8 9 10 11 12 A:即Atime,告诉系统不要修改对这个文件的最后访问时间。 S:即Sync,一旦应用程序对这个文件执行了写操作,使系统立刻把修改的结果写到磁盘。 a:即Append Only,系统只允许在这个文件之后追加数据,不允许任何进程覆盖或 ...
分类:系统相关   时间:2020-07-01 09:43:59    阅读次数:66
解决1055 - Expression #1......this is incompatible with sql_mode=only_full_group_by
mysql-8.0.20版本 问题: 1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'usertest.users.id' which is not fu ...
分类:数据库   时间:2020-06-30 20:21:09    阅读次数:83
【LeetCode】链表
24. Swap Nodes in Pairs https://leetcode.com/problems/linked-list-cycle/ Given a linked list, swap every two adjacent nodes and return its head. You m ...
分类:其他好文   时间:2020-06-29 22:41:37    阅读次数:55
求所有不重复路径, Unique Paths, LeetCode题解(四)
A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any p ...
分类:其他好文   时间:2020-06-29 20:01:24    阅读次数:82
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