javastart
javastart

Host Health Tests

Next Topic Previous Topic Print

Host Health Tests

Host Agent Log Directory

This is a host health test that checks that the filesystem containing the Cloudera Manager Agent's log directory has sufficient free space. This test can be configured using the Cloudera Manager Agent Log Directory Free Space Monitoring Absolute Thresholds and Cloudera Manager Agent Log Directory Free Space Monitoring Percentage Thresholds host monitoring settings.

Short Name: Agent Log Directory

Property Name Description Template Name Default Value Unit
Cloudera Manager Agent Log Directory Free Space Monitoring Absolute Thresholds The health check thresholds for monitoring of free space on the filesystem that contains the Cloudera Manager Agent's log directory. host_agent_log_directory_free_space_absolute_thresholds critical:1.073741824E9, warning:2.147483648E9 BYTES
Cloudera Manager Agent Log Directory Free Space Monitoring Percentage Thresholds The health check thresholds for monitoring of free space on the filesystem that contains the Cloudera Manager Agent's log directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Cloudera Manager Agent Log Directory Free Space Monitoring Absolute Thresholds setting is configured. host_agent_log_directory_free_space_percentage_thresholds critical:never, warning:never PERCENT

Host Agent Parcel Directory

This is a host health test that checks whether the filesystem containing the Cloudera Manager Agent's parcel directory has sufficient free space. This test can be configured using the Cloudera Manager Agent Parcel Directory Free Space Monitoring Absolute Thresholds and Cloudera Manager Agent Parcel Directory Free Space Monitoring Percentage Thresholds host monitoring settings.

Short Name: Agent Parcel Directory

Property Name Description Template Name Default Value Unit
Cloudera Manager Agent Parcel Directory Free Space Monitoring Absolute Thresholds The health check thresholds for monitoring of free space on the filesystem that contains the Cloudera Manager Agent's parcel directory. host_agent_parcel_directory_free_space_absolute_thresholds critical:5.36870912E9, warning:1.073741824E10 BYTES
Cloudera Manager Agent Parcel Directory Free Space Monitoring Percentage Thresholds The health check thresholds for monitoring of free space on the filesystem that contains the Cloudera Manager Agent's parcel directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Cloudera Manager Agent Parcel Directory Free Space Monitoring Absolute Thresholds setting is configured. host_agent_parcel_directory_free_space_percentage_thresholds critical:never, warning:never PERCENT

Host Agent Process Directory

This is a host health test that checks that the filesystem containing the Cloudera Manager Agent's process directory has sufficient free space. The process directory contains the configuration files for the processes which the Cloudera Manager Agent starts. This test can be configured using the Cloudera Manager Agent Process Directory Free Space Monitoring Absolute Thresholds and Cloudera Manager Agent Process Directory Free Space Monitoring Percentage Thresholds host monitoring settings.

Short Name: Agent Process Directory

Property Name Description Template Name Default Value Unit
Cloudera Manager Agent Process Directory Free Space Monitoring Absolute Thresholds The health check thresholds for monitoring of free space on the filesystem that contains the Cloudera Manager Agent's process directory. host_agent_process_directory_free_space_absolute_thresholds critical:1.048576E8, warning:2.097152E8 BYTES
Cloudera Manager Agent Process Directory Free Space Monitoring Percentage Thresholds The health check thresholds for monitoring of free space on the filesystem that contains the Cloudera Manager Agent's process directory. Specified as a percentage of the capacity on that filesystem. This setting is not used if a Cloudera Manager Agent Process Directory Free Space Monitoring Absolute Thresholds setting is configured. host_agent_process_directory_free_space_percentage_thresholds critical:never, warning:never PERCENT

Host Agent Status

This is a host health test that checks that the host's Cloudera Manager Agent is heartbeating correctly to the Cloudera Manager Server, is in contact with the Host Monitor, and has the correct software version. A failure of this health test may indicate a lack of connectivity between the host's Cloudera Manager Agent and the Cloudera Manager Server, a lack of connectivity betwen the host's Cloudera Manager Agent and the Host Monitor, or that the Cloudera Manager Agent or Host Monitor software is out of date. Check the status of the Cloudera Manager Agent by running /etc/init.d/cloudera-scm-agent status on the host, or look in the host's Cloudera Manager Agent logs for more details. If this test reports a software version mismatch between the Cloudera Manager Agent and the Host Monitor, check the version of each component by consulting the appropriate logs or the appropriate status web pages. This test can be enabled or disabled using the Host Process Health Test host configuration setting.

Short Name: Agent Status

Property Name Description Template Name Default Value Unit
Host Process Health Test Enables the health test that the host's process state is consistent with the role configuration host_scm_health_enabled true no unit

Host Clock Offset

This is a host health test that checks if the host's system clock appears to be out-of-sync with its NTP server(s). The test uses the 'ntpdc -np' command to check that the host is synchronized to an NTP peer and that the absolute value of the host's clock offset from that peer is not too large. If the command fails, NTP is not synchronized to a server, or the host's NTP daemon is not running or cannot be contacted, the test will return "Bad" health. The 'ntpdc -np' output contains a row for each of the host's NTP servers. The row starting with a '*' contains the peer to which the host is currently synchronized. No row starting with a '*' indicates that the host is not currently synchronized. Communication errors and too large an offset between the peer and the host time are examples of conditions that can lead to a host being unsynchronized. Make sure that UDP port 123 is open in any firewall that is in use. Check the system log for ntpd messages related to configuration errors. Use 'ntpdc -c iostat' to verify that packets are sent and recieved between the different peers. More information about the conditions of each peer can be found by running the command 'ntpq -c as'. The output of this command includes the association ID that can be used in combination with 'ntpq -c "rv "' to get more information about the status of each such peer. The command 'ntpq -c pe' can also be used to return a summary of all peers and the reason why they are not in use. If NTP is not in use on the host, this check should be disabled for the host using the configuration options shown below. Cloudera recommends using NTP for time synchronization of Hadoop clusters. A failure of this health test can indicate a problem with the host's NTP service or configuration. This test can be configured using the Host Clock Offset Thresholds host configuration setting.

Short Name: Clock Offset

Property Name Description Template Name Default Value Unit
Host Clock Offset Thresholds The thresholds for the host clock offset health test. The test compares this threshold against the absolute value of the clock offset reported by the host's NTP service from the 'ntpdc -np' command. Setting both the warning and critical threshold values to never turns off collection of the clock offset by the Cloudera Manager Agent. If NTP is not in use, both threshold values should be set to never. Cloudera recommends using NTP for time synchronization of Hadoop clusters. host_clock_offset_thresholds critical:10000.0, warning:3000.0 MILLISECONDS

Host DNS Resolution

This is a host health test that checks that the host's hostname and canonical name are consistent when checked from a Java process, and that the DNS resolution completes in a timely manner. The DNS resolution duration is calculated by measuring the time taken to call getLocalHost in a Java process on this host. Note that DNS information may be cached on the host, and this caching can affect the reported resolution duration. A failure of this health test may indicate that the host's DNS configuration is not correct or the host's DNS server is responding slowly. Check the Cloudera Manager Agent log for the names that were detected by this test or for errors running the Java process. The hostname and canonical name are considered to be consistent if the hostname or the hostname plus a domain name is the same as the canonical name. This health test uses domain names from the domain and search lines in /etc/resolv.conf. This health test does not consult /etc/nsswitch.conf and may give incorrect results if /etc/resolv.conf is not used by the host. There may be a delay of up to 5 minutes before this health test picks up changes to /etc/resolv.conf. This test can be configured using the Hostname and Canonical Name Health Check host configuration setting.

Short Name: DNS Resolution

Property Name Description Template Name Default Value Unit
Hostname and Canonical Name Health Check Whether the hostname and canonical names for this host are consistent when checked from a Java process. host_dns_resolution_enabled true no unit

Host Frame Errors

This is a host health test that checks for network frame errors across all network interfaces. A failure of this health test may indicate a problem with network hardware (e.g. switches) and can potentially cause other service or role-level performance problems. Check the host and network hardware logs for more details. This test can be configured using the Host Network Frame Error Percentage Thresholds, Host Network Frame Error Check Window, Host Network Frame Error Test Minimum Required Packets host configuration settings.

Short Name: Frame Errors

Property Name Description Template Name Default Value Unit
Host Network Frame Error Check Window The amount of time over which the host frame error checks for frame errors. host_network_frame_errors_window 15 MINUTES
Host Network Frame Error Percentage Thresholds The health check thresholds for the percentage of received packets that are frame errors. host_network_frame_errors_thresholds critical:0.5, warning:any PERCENT
Host Network Frame Error Test Minimum Required Packets The minimum number of received packets that must be received within the test window for this test to return "Bad" health. If less that this number of packets is received during the test window, the health check will never return "Bad" health. host_network_frame_errors_floor 0 no unit

Host Network Interface Speed

This is a host health test that checks for network interfaces that appear to be operating at less than full speed. The Cloudera Manager Agent uses ethtool ioctl to determine the network interface speed and duplex mode. A failure of this health test may indicate that network interface(s) may be configured incorrectly and may be causing performance problems. Use the ethtool command to check and configure the host's network interfaces to use the fastest available link speed and duplex mode. For inactive interfaces or for interfaces that do not support ethtool ioctl, the Cloudera Manager Agent cannot collect speed metrics. If the Cloudera Manager Agent fails to collect speed metrics for all network interfaces on the host, the test is disabled. This test can be configured using the Host's Network Interfaces Slow Link Modes Thresholds, Network Interface Expected Link Speed and Network Interface Expected Duplex Mode host configuration settings.

Short Name: Network Interface Speed

Property Name Description Template Name Default Value Unit
Host's Network Interfaces Slow Link Modes Thresholds The thresholds for the health check of the number of network interfaces that appear to be operating at less than full speed. host_network_interfaces_slow_mode_thresholds critical:never, warning:any no unit
Network Interface Expected Duplex Mode The expected duplex mode for network interfaces. host_nic_expected_duplex_mode Full no unit
Network Interface Expected Link Speed The expected network interface link speed. host_nic_expected_speed 1000 no unit

Host Swapping

This is a health test that checks that the host has not swapped out more than a certain number of pages over the last fifteen minutes. A failure of this health test may indicate misconfiguration of the host operating system, or too many processes running on the host. Try reducing vm.swappiness, or add more memory to the host. This test can be configured using the Host Memory Swapping Thresholds, Host Memory Swapping Check Window host configuration settings.

Short Name: Swapping

Property Name Description Template Name Default Value Unit
Host Memory Swapping Check Window The amount of time over which the memory swapping test checks for pages swapped. host_memswap_window 15 MINUTES
Host Memory Swapping Thresholds The health check thresholds of the number of pages swapped out on the host in the last 15 minutes host_memswap_thresholds critical:never, warning:any PAGES

Categories: Cloudera Manager | Monitoring | Operation | All Categories

Page generated May 5, 2016.
View All Categories
  • Cloudera Release Notes
  • Cloudera Operation
    • Cloudera Manager Entity Types
    • Cloudera Manager Entity Type Attributes
    • Cloudera Manager Health Tests
      • Active Database Health Tests
      • Active Key Trustee Server Health Tests
      • Activity Monitor Health Tests
      • Alert Publisher Health Tests
      • Beeswax Server Health Tests
      • Cloudera Management Service Health Tests
      • DSSD DataNode Health Tests
      • DataNode Health Tests
      • Event Server Health Tests
      • Failover Controller Health Tests
      • Flume Health Tests
      • Flume Agent Health Tests
      • Garbage Collector Health Tests
      • HBase Health Tests
      • HBase REST Server Health Tests
      • HBase Thrift Server Health Tests
      • HDFS Health Tests
      • History Server Health Tests
      • Hive Health Tests
      • Hive Metastore Server Health Tests
      • HiveServer2 Health Tests
      • Host Health Tests
      • Host Monitor Health Tests
      • HttpFS Health Tests
      • Hue Health Tests
      • Hue Server Health Tests
      • Impala Health Tests
      • Impala Catalog Server Health Tests
      • Impala Daemon Health Tests
      • Impala Llama ApplicationMaster Health Tests
      • Impala StateStore Health Tests
      • JobHistory Server Health Tests
      • JobTracker Health Tests
      • JournalNode Health Tests
      • Kafka Broker Health Tests
      • Kafka MirrorMaker Health Tests
      • Kerberos Ticket Renewer Health Tests
      • Key Management Server Health Tests
      • Key Management Server Proxy Health Tests
      • Key-Value Store Indexer Health Tests
      • Lily HBase Indexer Health Tests
      • Load Balancer Health Tests
      • Logger Health Tests
      • MapReduce Health Tests
      • Master Health Tests
      • Monitor Health Tests
      • NFS Gateway Health Tests
      • NameNode Health Tests
      • Navigator Audit Server Health Tests
      • Navigator Metadata Server Health Tests
      • NodeManager Health Tests
      • Oozie Health Tests
      • Oozie Server Health Tests
      • Passive Database Health Tests
      • Passive Key Trustee Server Health Tests
      • RegionServer Health Tests
      • Reports Manager Health Tests
      • ResourceManager Health Tests
      • SecondaryNameNode Health Tests
      • Sentry Health Tests
      • Sentry Server Health Tests
      • Service Monitor Health Tests
      • Solr Health Tests
      • Solr Server Health Tests
      • Sqoop 2 Health Tests
      • Sqoop 2 Server Health Tests
      • Tablet Server Health Tests
      • TaskTracker Health Tests
      • Tracer Health Tests
      • WebHCat Server Health Tests
      • Worker Health Tests
      • YARN (MR2 Included) Health Tests
      • ZooKeeper Health Tests
      • ZooKeeper Server Health Tests
  • Cloudera Glossary

 

你可能感兴趣的:(clouderamanger)

  • 【CDH】cloudera manger 如何开启Debug 日志调试模式 kiraraLou cdhclouderalog4j大数据
    前言在安装ClouderaManger时，遇到报错，需要开启Debug日志级别来排查下问题原因。这里记录下CM如何开启Debug级别。方法一：为整个服务启动DEBUG如果CM无法启动，则可以为整个服务器启用DEBUG或TRACE。警告：这可能非常非常冗长，因此可能很难捕获事件。编辑配置文件在CM5中编辑/usr/sbin/cmf-server在CM6中编辑/opt/cloudera/cm/bin/
  • sentry配置 空中的鱼1987 sentrycloudera
    当前cdh版本为5.2.0，且通过clouderamanger来管理集群。选择sentry配置方式，fileordb。file形式（sentry-provider.ini），存于hdfs上。选择groupmapping方式，有HadoopGroupResourceAuthorizationProvider（正式环境中）、LocalGroupResourceAuthorizationProvider
  • CDH6集群部署 weixin_34245749
    大数据集群管理方式分为手工方式（Apachehadoop）和工具方式（Ambari+hdp和ClouderaManger+CDH）主机：192.168.0.32：Server+agent192.168.0.33：agent192.168.0.34：agent安装之前准备环境：网络名称CDH需要IPv4。不支持IPv6。按如下方式配置群集中的每个主机，以确保所有成员可以相互通信：将主机名设置为唯一名
  • 使用cloudera manager进行hadoop安全认证-simple模式 AA赵师傅 hadoop运维CM
    使用clouderamanger进行hadoop安全认证配置-simple模式1，登录clouderamanger集群管理界面，选择“HDFS”2，选择“配置”项3，选择“服务范围”-->“安全性”4，找到“hadoop安全身份验证”选择simple模式，hadoop安全授权，选择启用，并填写授权的用户,授权的组，授权的管理员用户，授权的管理员组（注意：授权的用户中尽量把一些系统用户添加进去，否则
  • CM5和CDH5(5.13.1) 离线安装Centos7 尼小摩
    概述文件下载环境搭建安装ClouderaManger日志查看Q&A概述大数据时代，Hadoop是热门的Apache开源项目，公司大多基于其商业化从而满足自身的数据作业需求。CDH(Cloudera’sDistribution,includingApacheHadoop)，是Hadoop众多分支中的一种，由Cloudera维护，整合Hadoop及一系列数据服务，关于CDH，官网给予的解释如下：Cri
  • CDH 5.15.2集群搭建(基于阿里云) -无妄- Hadoop学习笔记
    文章目录软件版本ClouderaManger架构虚拟机设置Step1:安装虚拟机（阿里云忽略此步骤）Step2:设置网络（针对自己搭建的虚拟机）Step3:设置hosts(后续操作均以root用户执行)Step4:关闭SELinux及防火墙（阿里云机器忽略此步骤）Step5:设置ssh免密登录Step6:设置ntp时间同步服务（阿里云无需同步）Step7:上传安装文件Step8:安装jdk&CM(
  • CDH6集群部署 hellojinni CDH集群部署
    大数据集群管理方式分为手工方式（Apachehadoop）和工具方式（Ambari+hdp和ClouderaManger+CDH）主机：192.168.0.32：Server+agent192.168.0.33：agent192.168.0.34：agent安装之前准备环境：网络名称CDH需要IPv4。不支持IPv6。按如下方式配置群集中的每个主机，以确保所有成员可以相互通信：将主机名设置为唯一名
  • sentry配置 lookqlp sentrycloudera
    阅读更多当前cdh版本为5.2.0，且通过clouderamanger来管理集群。选择sentry配置方式，fileordb。file形式（sentry-provider.ini），存于hdfs上。选择groupmapping方式，有HadoopGroupResourceAuthorizationProvider（正式环境中）、LocalGroupResourceAuthorizationProv
  • sentry配置 lookqlp sentrycloudera
    阅读更多当前cdh版本为5.2.0，且通过clouderamanger来管理集群。选择sentry配置方式，fileordb。file形式（sentry-provider.ini），存于hdfs上。选择groupmapping方式，有HadoopGroupResourceAuthorizationProvider（正式环境中）、LocalGroupResourceAuthorizationProv
  • Spring4.1新特性——综述 jinnianshilongnian spring 4.1
    目录 Spring4.1新特性——综述 Spring4.1新特性——Spring核心部分及其他 Spring4.1新特性——Spring缓存框架增强 Spring4.1新特性——异步调用和事件机制的异常处理 Spring4.1新特性——数据库集成测试脚本初始化 Spring4.1新特性——Spring MVC增强 Spring4.1新特性——页面自动化测试框架Spring MVC T
  • Schema与数据类型优化 annan211 数据结构mysql
    目前商城的数据库设计真是一塌糊涂，表堆叠让人不忍直视，无脑的架构师，说了也不听。 在数据库设计之初，就应该仔细揣摩可能会有哪些查询，有没有更复杂的查询，而不是仅仅突出 很表面的业务需求，这样做会让你的数据库性能成倍提高，当然，丑陋的架构师是不会这样去考虑问题的。 选择优化的数据类型 1 更小的通常更好 更小的数据类型通常更快，因为他们占用更少的磁盘、内存和cpu缓存，
  • 第一节 HTML概要学习 chenke htmlWebcss
    第一节 HTML概要学习 1. 什么是HTML HTML是英文Hyper Text Mark-up Language(超文本标记语言)的缩写，它规定了自己的语法规则，用来表示比“文本”更丰富的意义，比如图片，表格，链接等。浏览器（IE,FireFox等）软件知道HTML语言的语法，可以用来查看HTML文档。目前互联网上的绝大部分网页都是使用HTML编写的。 打开记事本 输入一下内
  • MyEclipse里部分习惯的更改 Array_06 eclipse
    继续补充中---------------------- 1.更改自己合适快捷键windows-->prefences-->java-->editor-->Content Assist-->      Activation triggers for java的右侧“.”就可以改变常用的快捷键 选中 Text
  • 近一个月的面试总结 cugfy 面试
    本文是在学习中的总结，欢迎转载但请注明出处：http://blog.csdn.net/pistolove/article/details/46753275 前言       打算换个工作，近一个月面试了不少的公司，下面将一些面试经验和思考分享给大家。另外校招也快要开始了，为在校的学生提供一些经验供参考，希望都能找到满意的工作。 
  • HTML5一个小迷宫游戏 357029540 html5
         通过《HTML5游戏开发》摘抄了一个小迷宫游戏，感觉还不错，可以画画，写字，把摘抄的代码放上来分享下，喜欢的同学可以拿来玩玩！ <html> <head> <title>创建运行迷宫</title> <script type="text/javascript"
  • 10步教你上传githib数据 张亚雄 git
    官方的教学还有其他博客里教的都是给懂的人说得，对已我们这样对我大菜鸟只能这么来锻炼，下面先不玩什么深奥的，先暂时用着10步干净利索。等玩顺溜了再用其他的方法。 操作过程（查看本目录下有哪些文件NO.1）ls （跳转到子目录NO.2）cd+空格+目录 （继续NO.3）ls （匹配到子目录NO.4）cd+ 目录首写字母+tab键+（首写字母“直到你所用文件根就不再按TAB键了”） （查看文件
  • MongoDB常用操作命令大全 adminjun mongodb操作命令
    成功启动MongoDB后，再打开一个命令行窗口输入mongo，就可以进行数据库的一些操作。输入help可以看到基本操作命令，只是MongoDB没有创建数据库的命令，但有类似的命令 如：如果你想创建一个“myTest”的数据库，先运行use myTest命令，之后就做一些操作（如：db.createCollection('user')）,这样就可以创建一个名叫“myTest”的数据库。 一
  • bat调用jar包并传入多个参数 aijuans
    下面的主程序是通过eclipse写的： 1.在Main函数接收bat文件传递的参数（String[] args）  如：   String ip =args[0];          String user=args[1];       &nbs
  • Java中对类的主动引用和被动引用 ayaoxinchao java主动引用对类的引用被动引用类初始化
      在Java代码中，有些类看上去初始化了，但其实没有。例如定义一定长度某一类型的数组，看上去数组中所有的元素已经被初始化，实际上一个都没有。对于类的初始化，虚拟机规范严格规定了只有对该类进行主动引用时，才会触发。而除此之外的所有引用方式称之为对类的被动引用，不会触发类的初始化。虚拟机规范严格地规定了有且仅有四种情况是对类的主动引用，即必须立即对类进行初始化。四种情况如下：1.遇到ne
  • 导出数据库 提示 outfile disabled BigBird2012 mysql
    在windows控制台下，登陆mysql，备份数据库：   mysql>mysqldump -u root -p test test > D:\test.sql 使用命令 mysqldump 格式如下： mysqldump -u root -p *** DBNAME > E:\\test.sql。 注意：执行该命令的时候不要进入mysql的控制台再使用，这样会报
  • Javascript 中的 && 和 || bijian1013 JavaScript&&||
            准备两个对象用于下面的讨论 var alice = { name: "alice", toString: function () { return this.name; } } var smith = { name: "smith",
  • [Zookeeper学习笔记之四]Zookeeper Client Library会话重建 bit1129 zookeeper
    为了说明问题，先来看个简单的示例代码：   package com.tom.zookeeper.book; import com.tom.Host; import org.apache.zookeeper.WatchedEvent; import org.apache.zookeeper.ZooKeeper; import org.apache.zookeeper.Wat
  • 【Scala十一】Scala核心五：case模式匹配 bit1129 scala
    package spark.examples.scala.grammars.caseclasses object CaseClass_Test00 { def simpleMatch(arg: Any) = arg match { case v: Int => "This is an Int" case v: (Int, String)
  • 运维的一些面试题 yuxianhua linux
    1、Linux挂载Winodws共享文件夹   mount -t cifs //1.1.1.254/ok /var/tmp/share/ -o username=administrator,password=yourpass 或 mount -t cifs -o username=xxx,password=xxxx //1.1.1.1/a /win    
  • Java lang包-Boolean BrokenDreams boolean
             Boolean类是Java中基本类型boolean的包装类。这个类比较简单，直接看源代码吧。 public final class Boolean implements java.io.Serializable,
  • 读《研磨设计模式》-代码笔记-命令模式-Command bylijinnan java设计模式
    声明： 本文只为方便我个人查阅和理解，详细的分析以及源代码请移步 原作者的博客http://chjavach.iteye.com/ import java.util.ArrayList; import java.util.Collection; import java.util.List; /** * GOF 在《设计模式》一书中阐述命令模式的意图：“将一个请求封装
  • matlab下GPU编程笔记 cherishLC matlab
    不多说，直接上代码 gpuDevice % 查看系统中的gpu,,其中的DeviceSupported会给出matlab支持的GPU个数。 g=gpuDevice(1); %会清空 GPU 1中的所有数据,,将GPU1 设为当前GPU reset(g) %也可以清空GPU中数据。 a=1; a=gpuArray(a); %将a从CPU移到GPU中 onGP
  • SVN安装过程 crabdave SVN
    SVN安装过程   subversion-1.6.12   ./configure --prefix=/usr/local/subversion --with-apxs=/usr/local/apache2/bin/apxs --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr --with-openssl=/
  • sql　行列转换 daizj sql行列转换行转列列转行
    行转列的思想是通过case when 来实现 列转行的思想是通过union all 来实现 下面具体例子： 假设有张学生成绩表(tb)如下: Name Subject Result 张三 语文　　74 张三 数学　　83 张三 物理　　93 李四 语文　　74 李四 数学　　84 李四 物理　　94 */ /* 想变成 姓名   &
  • MySQL--主从配置 dcj3sjt126com mysql
    linux下的mysql主从配置： 说明：由于MySQL不同版本之间的(二进制日志)binlog格式可能会不一样，因此最好的搭配组合是Master的MySQL版本和Slave的版本相同或者更低， Master的版本肯定不能高于Slave版本。（版本向下兼容） mysql1  : 192.168.100.1    //master mysq
  • 关于yii 数据库添加新字段之后model类的修改 dcj3sjt126com Model
    rules: array('新字段','safe','on'=>'search') 1、array('新字段', 'safe')//这个如果是要用户输入的话，要加一下， 2、array('新字段', 'numerical'),//如果是数字的话 3、array('新字段', 'length', 'max'=>100),//如果是文本 1、2、3适当的最少要加一条，新字段才会被
  • sublime text3 中文乱码解决 dyy_gusi Sublime Text
    sublime text3中文乱码解决 原因：缺少转换为UTF-8的插件 目的：安装ConvertToUTF8插件包 第一步：安装能自动安装插件的插件，百度“Codecs33”，然后按照步骤可以得到以下一段代码： import urllib.request,os,hashlib; h = 'eb2297e1a458f27d836c04bb0cbaf282' + 'd0e7a30980927
  • 概念了解：CGI，FastCGI，PHP-CGI与PHP-FPM geeksun PHP
    CGI CGI全称是“公共网关接口”(Common Gateway Interface)，HTTP服务器与你的或其它机器上的程序进行“交谈”的一种工具，其程序须运行在网络服务器上。 CGI可以用任何一种语言编写，只要这种语言具有标准输入、输出和环境变量。如php,perl,tcl等。 FastCGI FastCGI像是一个常驻(long-live)型的CGI，它可以一直执行着，只要激活后，不
  • Git push 报错 "error: failed to push some refs to " 解决 hongtoushizi git
    Git push 报错 "error: failed to push some refs to " . 此问题出现的原因是：由于远程仓库中代码版本与本地不一致冲突导致的。 由于我在第一次git pull --rebase 代码后，准备push的时候，有别人往线上又提交了代码。所以出现此问题。 解决方案： 1： git pull    2：
  • 第四章 Lua模块开发 jinnianshilongnian nginxlua
    在实际开发中，不可能把所有代码写到一个大而全的lua文件中，需要进行分模块开发；而且模块化是高性能Lua应用的关键。使用require第一次导入模块后，所有Nginx 进程全局共享模块的数据和代码，每个Worker进程需要时会得到此模块的一个副本（Copy-On-Write），即模块可以认为是每Worker进程共享而不是每Nginx Server共享；另外注意之前我们使用init_by_lua中初
  • java.lang.reflect.Proxy liyonghui160com
      1.简介   Proxy 提供用于创建动态代理类和实例的静态方法 （1）动态代理类的属性 代理类是公共的、最终的，而不是抽象的 未指定代理类的非限定名称。但是，以字符串 "$Proxy" 开头的类名空间应该为代理类保留 代理类扩展 java.lang.reflect.Proxy 代理类会按同一顺序准确地实现其创建时指定的接口
  • Java中getResourceAsStream的用法 pda158 java
    1.Java中的getResourceAsStream有以下几种： 1. Class.getResourceAsStream(String path) ： path 不以’/'开头时默认是从此类所在的包下取资源，以’/'开头则是从ClassPath根下获取。其只是通过path构造一个绝对路径，最终还是由ClassLoader获取资源。 　　2. Class.getClassLoader.get
  • spring 包官方下载地址（非maven） sinnk spring
    SPRING官方网站改版后，建议都是通过 Maven和Gradle下载，对不使用Maven和Gradle开发项目的，下载就非常麻烦，下给出Spring Framework jar官方直接下载路径:   http://repo.springsource.org/libs-release-local/org/springframework/spring/   s
  • Oracle学习笔记(7) 开发PLSQL子程序和包 vipbooks oraclesql编程
        哈哈，清明节放假回去了一下，真是太好了，回家的感觉真好啊！现在又开始出差之旅了，又好久没有来了，今天继续Oracle的学习！      这是第七章的学习笔记，学习完第六章的动态SQL之后，开始要学习子程序和包的使用了……，希望大家能多给俺一些支持啊！     编程时使用的工具是PLSQL
按字母分类： ABCDEFGHIJKLMNOPQRSTUVWXYZ其他