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  • mysql查看索引利用率2022-06-01 14:31:06

    -- mysql查看索引利用率 -- 如果很慢把排序去掉,加上limit 并且在where条件中限定表名。 -- cardinality越接近0,利用率越低 SELECT t.TABLE_SCHEMA, t.TABLE_NAME, INDEX_NAME, CARDINALITY, TABLE_ROWS, CARDINALITY / TABLE_ROWS AS SELECTIVITY FROM informa

  • Mybatis 查询前判断表是否存在2022-06-01 10:04:39

    CommonMapper.java 接口方式 @Mapper @Component public interface CommonMapper { /** * 判断表是否存在 * * @param tableName 表名称 * @return 结果 * @author yunnuo */ @Select(" SELECT COUNT(*) as count FROM information_sche

  • mysql 找出没有主键的表2022-06-01 09:00:58

    1,根据约束字典表table_constraints 来查   SELECT t.table_schema AS database_name, t.table_name FROM information_schema.TABLES t LEFT JOIN information_schema.TABLE_CONSTRAINTS c ON t.TABLE_SCHEMA = c.TABLE_SCHEMA AND t.table_name = c.TABLE_NAME AND c.CONSTRA

  • Identification of Key Nodes Based on Integrating of Global and Local Information论文2022-05-31 17:32:38

      之前使用PageRank提取关键结点的方法是计算每个结点的PageRank的值,然后提取top10%的结点作为关键结点。但是PageRank是从全局视角给网页排序,从而得到的每个结点的PageRank的值。   这篇文章结合复杂网络的局部特征和全局特征,通过标准化每个节点的度和中间性中心性,利用节点之

  • .NET日志系统2022-05-28 22:00:22

    1、日志级别:Trace < Debug < Information < Warning < Error < Critical2、日志提供者(LoggingProvider):把日志输出到哪里。控制台、文件、数据库等3、.NET的日志非常灵活,对应业务代码只要注入日志对象记录日志即可,具体哪些日志输出到哪里、什么样的格式、是否输出等都有配置或者

  • mysqldump报错information_schema (1109)2022-05-23 11:00:07

    经过排查是mysqldump 8 中默认启用了一个新标志。 您可以通过简单地添加 –column-statistics=0 来禁用它。由于 MySQL 8 及更高版本,优化器会考虑直方图统计信息,因此 mysqldump 也会尝试自动生成 ANALYZE TABLE 语句,以便在加载转储时重置直方图统计信息。那个时候是指information_

  • SQL-反向-模糊查询-Demo2022-05-20 18:03:44

    总结:SQL-反向-模糊查询-Demo SELECT table_name FROM information_schema.tables WHERE TABLE_SCHEMA=(SELECT DATABASE()) AND table_name NOT IN (SELECT table_name FROM information_schema.tables WHERE TABLE_SCHEMA=(SELECT DATABASE()) AND table_name LIKE "%copy%&qu

  • mysql查询服务器中所有表及其字段含义2022-05-18 20:34:26

    select * from information_schema.tables where TABLE_SCHEMA !='information_schema' ;相关博客:https://blog.csdn.net/weixin_40918067/article/details/116868906     https://zhuanlan.zhihu.com/p/55512825  

  • Multi-parameter estimation beyond quantum Fisher information2022-05-18 19:31:08

    Eq(75) \[\left( \begin{matrix} \frac{1}{2}\left( 1+cos\theta \right)& \frac{1}{2}sin\theta e^{-i\varphi}\\ \frac{1}{2}sin\theta e^{i\varphi}& \frac{1}{2}\left( 1-cos\theta \right)\\ \end{matrix} \right) \\ \frac{1}{2

  • 网络空间搜索引擎2022-05-09 03:32:23

    网络空间搜索引擎(OSINT Open source intelligence) 可以查找物联网所有硬件设备和软件程序。 如何扫描:   使用网络扫描工具:namp/zmap   方式:IP库/枚举 如何识别一个设备:   爬虫-url/ip-域名/开放端口/操作系统/物理地址/MAC地址/设别类型/ 实时威胁地图:   https://www.fire

  • MySQL导出数据字典2022-05-03 15:31:33

    -- 查询指定数据库所有表结构信息 SELECT TABLE_SCHEMA, TABLE_NAME, COLUMN_NAME, COLUMN_TYPE, COLUMN_COMMENT FROM information_schema. COLUMNS WHERE TABLE_SCHEMA= 'tb_name' #db_name代表数据库名 -- 查询指定数据库所有表结构信息 SELECT TABLE_SCHEMA AS'数据库名',

  • SQL注入之information_schema2022-05-01 23:32:48

        在学习SQL注入时, 经常拿出来的例子就是PHP+MySQL这一套经典组合. 其中又经常提到的>=5.0版本的MySQL的内置库: information_schema   简单看一下information_schema库中的内容 其中在注入时关注的两张表: tables 和 columns mysql> use information_schema Database chan

  • How to Register and Activate X100 PAD?2022-04-29 18:00:36

              X-100 PAD is the first tablet key programmer in the world! It not only provides customers with professional key programming, but also the most needed special functions for workshop   How to Register and Activate X100 PAD?   1. Connect X100

  • GIS-KG building a large-scale hierarchical knowledge graph for geographic information science2022-04-26 19:04:08

    GIS-KG building a large-scale hierarchical knowledge graph for geographic information science(GIS-KG: 为地理信息科学构建大规模的层次知识图谱) 0 Abstract 有组织的知识库可以促进现有知识的探索和领域中新兴主题的检测。关于地理信息科学及其相关系统技术 (GIS) 及其相关

  • How to use lspci, lsscsi, lsusb, and lsblk to get Linux system devices information2022-04-24 19:33:27

    There are many utilities available to check Linux system hardware information. Some commands report altogether like CPU, Processor, memory, storage, disk, etc,. and the rest will cover only specific hardware components like CPU or processor or memory, etc

  • Generative Adversarial Imitation Learning2022-04-24 10:02:58

    郑重声明:原文参见标题,如有侵权,请联系作者,将会撤销发布!   ADVANCES IN NEURAL INFORMATION PROCESSING SYSTEMS 29 (NIPS 2016), (2016): 4565-4573  

  • com.microsoft.sqlserver:sqljdbc4:jar:4.0 is missing, no dependency information available2022-04-21 17:32:26

    sqljdbc4:jar现在不能直接mvn install安装,如下步骤: 1.下载sqljdbc4-4.0 提取码:9ag4 2.直接放到maven仓库是不行的,下载完后,启动CMD,输入如下命令: -Dfile需要改为sqljdbc4-4.0.jar当前所在文件位置,然后执行即可 mvn install:install-file -Dfile=C:\Users\jack\Desktop\sqljdbc4-4.0

  • 笔记2022-04-18 00:00:06

    Version()版本 User()用户 Database()数据库 单引号的闭合字符,判断出来闭合字符判断列数order by  采用二分法,然后判断位 union select*,*,*注意是,不是。; 先查版本,再求当前数据库名,求出所有数据库名要用information_schema的库group_concat(table_name) from information_schema.tables

  • 【mysql】查看/批量kill进程2022-04-15 18:31:17

      -- 查看进程 show PROCESSLIST --kill 单个进程 kill ${id} kill 1827021 -- 批量kill进程 select CONCAT('KILL ',id,';') FROM information_schema.`PROCESSLIST` where db = 'db_name'; 或 SELECT CONCAT('KILL ',id,';') AS comma

  • mysql大事务可能导致哪些问题?2022-04-10 21:33:53

    可以在 information_schema 库的 innodb_trx 这个表中查询长事务,比如下面这个语句,用于查找持续时间超过 60s 的事务: select * from information_schema.innodb_trx where TIME_TO_SEC(timediff(now(),trx_started))>60 主备延迟。如果主服务器执行大事务花费了10分钟,那么从服

  • My Onair Privacy Policy2022-04-10 21:02:41

            My Onair is a Masoair (hereinafter referred to as "we") provide products. When you use our services, we may collect and use your relevant information. We hope to explain to you through this "Privacy Policy" how we collect, use,

  • Improving Compression Artifact Reduction via End-to-End Learning of Side Information-20202022-03-30 22:35:13

    概要: 该文提出通过传输side信息来减弱基于神经网络压缩方法的伪影。 6.1 应用场景: 该文的工作是初步的探索端到端学习边信息的压缩,为得到增强的解码信息提供了借鉴。 6.2 关键设计思路: 边信息是由编码器通过分析原始图像和压缩图像之间的差别而获得的伪影描述符。在解码器中,接收到

  • iBluetooth隐私政策2022-03-30 20:36:09

    iBluetooth respects and protects the privacy of all users who use the service. In order to provide you with more accurate and personalized services, iBluetooth will use and disclose your personal information in accordance with the provisions of this Priva

  • .net core 连接mysql 六:创建数据库连接DefaultConnection2022-03-27 11:34:06

          { "ConnectionStrings": { "DefaultConnection": "server=localhost;uid=root;pwd=123456;port=3306;database=fjxw_echarge;" }, "Logging": { "LogLevel": { "Default": "Informatio

  • Chapter 1: What Is an Information System?2022-03-19 15:02:15

    Chapter 1: What Is an Information System? Learning Objectives Upon successful completion of this chapter, you will be able to: define what an information system is by identifying its major components; describe the basic history of information systems

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