SQL Server-聚焦移除Bookmark Lookup、RID Lookup、Key Lookup提高SQL查询性能

  前言前面几节都是讲的基础内容,本节我们讲讲索引性能优化,当对大数据进行处理时首先想到的就是索引,一旦遇到这样的问题则手忙脚乱,各种查资料,为何平常不扎实基本功呢,我们由浅入深,简短的内容,深入的理解,而非一上来就把问题给框死,立马给出解决方案,抛出问题,再到解决问题,你GET
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java.security.NoSuchAlgorithmException: AES KeyGenerator not available

异常信息Caused by: Java.lang.IllegalStateException: Unable to acquire AES algorithm. This is required to function.at org.apache.shiro.crypto.AbstractSymm
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Activiti BUSINESS_KEY_ in a call activiti

https://community.alfresco.com/thread/221280-business-key-in-a-call-activityhttps://stackoverflow.com/questions/26497569/activity-how-to-know-if-an-ex
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【转】Mac本地生成SSH Key 的方法

 1. 查看秘钥是否存在打开终端查看是否已经存在SSH密钥:cd ~/.ssh如果没有密钥则不会有此文件夹,有则备份删除,   也可以直接删除,  2.生成新的秘钥, 命令如下 $ssh-keygen -t rsa -C 
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System.ArgumentException: 已添加了具有相同键的项。(An item with the same key has already been added) 在 System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) 在 System.Web.Mvc.Js

最近将一个项目从ASP.NET MVC 3升级至刚刚发布的ASP.NET MVC 5.1,升级后发现一个ajax请求出现了500错误,日志中记录的详细异常信息如下:System.ArgumentException: 已添加了具有相同键的项。(An item with the same key has
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Spark操作:Aggregate和AggregateByKey

1. AggregateAggregate即聚合操作。直接上代码:import org.apache.spark.{SparkConf, SparkContext}object AggregateTest { def main(args:Array[String]) = { //
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[TypeStyle] Use TypeStyle keyframes to create CSS animations

We cover CSS keyframes and how to create them using TypeStyle. We then show how to use the keyframes function to create an animation. We also discuss
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vue 中$index $key 已经移除了

https://cn.vuejs.org/v2/guide/migration.html#index-and-key-移除 之前可以这样:123456<ul id="example">    <li v-for=
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GPG key retrieval failed

 Total size: 340 kInstalled size: 1.2 MIs this ok [y/N]: yDownloading Packages:warning: rpmts_HdrFromFdno: Header V4 DSA/SHA1 Signature, key ID 7
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zabbix 通过自定义key完成网卡监控

创建执行脚本:# cat /etc/zabbix/monitor_scripts/network.sh #!/bin/bash#set -x usage() { echo "Useage : $0" echo "eg. sh $0 eth0" exit 1}
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