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前端数据库

系统优化---功能优化心得

连错次数及其他边缘信息问题描述当用户答题数据量增大的时候，应该是几千条的时候，每次查询需要5秒左右的响应时间问题分析首先是硬件，由于我们的产品是平板，且设备整体性能比较差；其次，pad本地用的是sqlite数据库不支持变量声明

beiwolide·2024-09-07 04:45

MySQL数据库学习笔记，知识点和案例整理，期末三天复习完【简单且详细】

MySQL数据库近三万字学习笔记，超级详细！文章目录MySQL数据库近三万字学习笔记，超级详细！前言一、day1二、day2三、day3前言MySQL数据库知识点和案例总结，非常详细，将近三万字!

编程ID·2024-09-07 03:12

向量数据库对比分析报告

FAISS、Milvus、Weaviate和OpenAIAPI四个工具的对比分析，主要针对是否支持离线、开发难度、debug支持、生态系统以及Python接口等方面。1.FAISS(FacebookAISimilaritySearch)是否支持离线:支持。FAISS是一个离线库，可以部署在本地或服务器上，不需要网络连接。开发难度:中等。FAISS是一个低级别的工具，需要开发者对近似最近邻搜索算法和

大霸王龙·2024-09-07 03:11

计算机毕业设计springboot健身中心前台信息管理系统qotli源码+系统+程序+lw文档+部署

lw文档+部署计算机毕业设计springboot健身中心前台信息管理系统qotli源码+系统+程序+lw文档+部署本源码技术栈：项目架构：B/S架构开发语言：Java语言开发软件：ideaeclipse前端技术

呦呦网络·2024-09-07 03:11

App_data目录----数据库连接字符串的写法

asp.net2.0有一个特殊目录App_data,通常Sqlserver2005express数据文件就放在这个目录，相应的数据库连接串就是：connectionString="……datasource

pmandy·2024-09-07 02:39

基于JAVA家庭记账系统计算机毕业设计源码+系统+mysql数据库+lw文档+部署

基于JAVA家庭记账系统计算机毕业设计源码+系统+mysql数据库+lw文档+部署基于JAVA家庭记账系统计算机毕业设计源码+系统+mysql数据库+lw文档+部署本源码技术栈：项目架构：B/S架构开发语言

丽扬科技·2024-09-07 02:09

【架构】一款永不重复的高性能分布式发号器，实战nginxpdf

零、基本术语发号器：用于生成唯一流水号（也即俗称的唯一ID）的服务系统，称之为发号器一、技术选型UUID优点：能够保证唯一性缺点：（1）完全的时间数据=>性能比较差、比较长、占用空间大、间接导致数据库性能下降

m0_64867839·2024-09-07 02:39

基于JAVA智能推荐二手车交易网站计算机毕业设计源码+系统+数据库+lw文档+部署

基于JAVA智能推荐二手车交易网站计算机毕业设计源码+系统+数据库+lw文档+部署基于JAVA智能推荐二手车交易网站计算机毕业设计源码+系统+数据库+lw文档+部署本源码技术栈：项目架构：B/S架构开发语言

光光网络·2024-09-07 02:07

mysql连接oceanbase数据库集群+租户

mysql集成的有连接oceanbase数据库的方式，所以只需要对参数进行修改即可。url:jdbc:mysql://[ip地址]:[端口]/[数据库]?

AE_·2024-09-07 02:36

html如何嵌套页面？标签告诉你答案</h4> </div> <div class="article-excerpt"> web<em>前端</em>全栈资料粉丝福利（面试题、视频、资料笔记、进阶路线）在这里小编首先介绍的是HTML中iframe标签的用法：怎么在一个网页中嵌入另一个网页呢，我们可以用html中的iframe标签搞定 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> PHP9年架构师<span class="dot">·</span>2024-09-07 02:06 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="newsitem-info clearfix"> <a href="/article/1832120605256806400.htm" ></a> <a target="_blank" href="/article/1832120605256806400.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">Oracle点滴</h4> </div> <div class="article-excerpt"> administrator/administrator3.oracle8.0.5怎幺创建<em>数据库</em>?用orainst。如果有motif界面，可以用ora </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> zwei1121<span class="dot">·</span>2024-09-07 02:06 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/Oracle/1.htm"> Oracle </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/oracle/1.htm"> oracle </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/table/1.htm"> table </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/sql/1.htm"> sql </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/%E6%95%B0%E6%8D%AE%E5%BA%93/1.htm"> 数据库 </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/session/1.htm"> session </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/user/1.htm"> user </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832117329304055808.htm" ></a> <a target="_blank" href="/article/1832117329304055808.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">释放oracle undo表空间,undo表空间释放</h4> </div> <div class="article-excerpt"> IMPDP工具导入大表(166G)数据时,报undo表空间不能扩展,导入工作失败.手工停止了impdp后,undo表空间存在无法自动释放的故障.本文主要描述如何通过重建undo表空间来手工释放undo表空间.<em>数据库</em>环境的描述 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> IBEANI<span class="dot">·</span>2024-09-07 02:05 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/%E9%87%8A%E6%94%BEoracle/1.htm"> 释放oracle </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/undo%E8%A1%A8%E7%A9%BA%E9%97%B4/1.htm"> undo表空间 </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832114554105065472.htm" ></a> <a target="_blank" href="/article/1832114554105065472.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">powerdns配置</h4> </div> <div class="article-excerpt"> 系统：centos7组成软件：epel仓库、mariadb<em>数据库</em>、powerdns步骤1：安装epel仓库yum install epel-release.noarch2:安装mariaDByum -y </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> weixin_33701251<span class="dot">·</span>2024-09-07 01:03 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/php/1.htm"> php </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/%E6%95%B0%E6%8D%AE%E5%BA%93/1.htm"> 数据库 </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/%E8%BF%90%E7%BB%B4/1.htm"> 运维 </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832113671346679808.htm" ></a> <a target="_blank" href="/article/1832113671346679808.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">oracle 扩容undo,【案例】Oracle RAC<em>数据库</em>undo使用率较高的解决思路办法</h4> </div> <div class="article-excerpt"> 天萃荷净Oracle研究中心案例分析：运维DBA反映Oracle<em>数据库</em>undo使用较大，结合案例分析undo使用问题。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 南门居士-杜锦刚<span class="dot">·</span>2024-09-07 01:33 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/oracle/1.htm"> oracle </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/%E6%89%A9%E5%AE%B9undo/1.htm"> 扩容undo </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832110773795647488.htm" ></a> <a target="_blank" href="/article/1832110773795647488.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">MySQL复习笔记</h4> </div> <div class="article-excerpt"> deleteDDL一、表的创建二、删除表三、快速删除表中数据四、约束TCLDCL二、常用命令三、数据处理函数1、常见的单行处理函数2、分组函数(多行处理函数)四、存储引擎五、事务六、索引七、视图八、DBA命令九、<em>数据库</em> </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> new wei<span class="dot">·</span>2024-09-07 01:02 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/java/1.htm"> java </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/mysql/1.htm"> mysql </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832105984995192832.htm" class='news-img' style="background-image:url('http://img.e-com-net.com/image/info8/33c9c5605a6440aa917fc34036bc9535.jpg@!80x60')" ></a> <a target="_blank" href="/article/1832105984995192832.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">sql注入漏洞</h4> </div> <div class="article-excerpt"> 主要原因是程序员在开发用户和<em>数据库</em>交互的系统时没有对用户输入的字符串进行过滤，转义，限制或处理不严谨，导致用户可以通过输入精心构造的字符串去非法获取到<em>数据库</em>中的数据。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> mineflame_<span class="dot">·</span>2024-09-07 01:00 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/sql/1.htm"> sql </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832103085938405376.htm" ></a> <a target="_blank" href="/article/1832103085938405376.htm"> <div class="mb5 mt5"> <h4 class="news__item-title mt0">Oracle undo表空间爆满的解决</h4> </div> <div class="article-excerpt"> 1.查找<em>数据库</em>的UNDO表空间名,确定当前例程正在使用的UNDO表空间：Showparameterundo_tablespace。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 小学生汤米<span class="dot">·</span>2024-09-07 01:29 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/ORACLE/1.htm"> ORACLE </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/ORACLE/1.htm"> ORACLE </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/undo/1.htm"> undo </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/%E7%A9%BA%E9%97%B4%E6%BB%A1/1.htm"> 空间满 </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="newsitem-info clearfix"> <a href="/article/1832101947763683328.htm" ></a> <a target="_blank" href="/article/1832101947763683328.htm"> <div class="mb5 mt5"> <h4 class="news__item-title mt0">undo 表空间满了的处理方法</h4> </div> <div class="article-excerpt"> 在插入数据或者update时，有时会报ora_30036错误，导致数据插入失败，其原因是<em>数据库</em>的undo表空间不足所致，解决undo表空间满的方法有两种。 </div> </a> <div class="news__item-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> cm_0205<span class="dot">·</span>2024-09-07 01:58 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/%E6%95%B0%E6%8D%AE%E5%BA%93/1.htm"> 数据库 </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832089847431524352.htm" ></a> <a target="_blank" href="/article/1832089847431524352.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">python pdf-pythonPDF书籍十三本</h4> </div> <div class="article-excerpt"> pythonPDF书籍十三本闯客网技术论坛部分Python资料合集，闯客网还有很多关于编程语言的学习资料和项目案例等免费下载，还有c++，c语言，java，Android和<em>前端</em>等等等的编程资料，应有尽有 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> weixin_37988176<span class="dot">·</span>2024-09-07 00:53 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832065667143135232.htm" ></a> <a target="_blank" href="/article/1832065667143135232.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">面试被问还不懂？一口气怼完12种@Transactional的失效场景</h4> </div> <div class="article-excerpt"> <em>数据库</em>事务是后端开发中不可缺少的一块知识点。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 谁叫我土豆了<span class="dot">·</span>2024-09-06 22:48 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832062124772388864.htm" ></a> <a target="_blank" href="/article/1832062124772388864.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">ES架构及原理</h4> </div> <div class="article-excerpt"> Elasticsearch是一个兼有搜索引擎和NoSQL<em>数据库</em>功能的开源系统，基于Java/Lucene构建，可以用于全文搜索，结构化搜索以及近实时分析。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 李澎昆<span class="dot">·</span>2024-09-06 22:43 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/ES/1.htm"> ES </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/ES/1.htm"> ES </a> </li> </ul> </div> </div> </div> <div class="news-item streamitem clearfix mt15"> <div class="news__item-info clearfix"> <a href="/article/1832060738097737728.htm" ></a> <a target="_blank" href="/article/1832060738097737728.htm"> <div class="mb5 mt5"> <h4 class="newsitem-title mt0">用合适的索引避免不必要的全表扫描</h4> </div> <div class="article-excerpt"> Oracle<em>数据库</em>里大部分SQL优化的问题都可以增加或减少索引的方式来解决，但这绝不是全部。 </div> </a> <div class="newsitem-meta"> <span class=" votes-operation"> <span class="wrap"> <i class="glyphicon glyphicon-thumbs-up hot"></i> </span> <span class="author pr20"> 数字天下<span class="dot">·</span>2024-09-06 22:13 </span> </span> <ul class="taglist--inline inline-block articletitle--tag"> <li class="tagPopup mb5"> <a class="tag" href="/search/oracle/1.htm"> oracle </a> </li> <li class="tagPopup mb5"> <a class="tag" href="/search/%E7%B4%A2%E5%BC%95/1.htm"> 索引 </a> </li> <li class="tagPopup mb5"> <a class="tag" 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