disk. # use strict; use DBI; use DBD::Oracle qw(:ora_session_modes); use POSIX; # Handle the version query...filename, # i.e. it has to begin with the '+' followed by a disk group name, # followed by at least one...->execute; my $col_value = $sql->fetchrow_array; $sql->finish; return $col_value; } # Get a column...and AU numbers from x$kffxp for a given virtual extent number. # This will return one row for an external...->execute; # Expecting one disk number and one AU number per row while ( my @row = $sql->fetchrow_array
于是查看是哪个文件夹占用了这100G,最后发如今数据文件夹里发现 非常多类似#sql-*.ibd暂时文件和同文件名称的#sql-*.frm。...就会在数据文件夹里存在一些中间表,这些中间表是以“#sql-”开头的暂时表,在你的数据文件夹里会看到 #sql-*.ibd和对应的 #sql-*.frm ,假设 #sql-*.ibd 和 #sql-*...磁盘空间100多G也回收了,例如以下所看到的 mysql> drop table `#mysql50##sql-928_76f7`; Query OK, 0 rows affected (16.28...sec) 说明:假设在数据文件夹里仅仅有#sql-*.ibd。...而没有#sql-*.frm的话,就须要特殊处理 1.在还有一数据schema里创建一个和欲删除表一样的表结构(包含同样的列和索引) mysql> create database test mysql
3,myisam 与 innoDB 它们都是mysql数据库的引擎,我们一般建表默认的是 myisam 引擎,比较:http://www.cnblogs.com/vicenteforever/articles.../1613119.html,个人认为,类似于insert、update、delete 这种操作如果涉及多表或单表互联操作的情况,为了避免数据写脏,请使用事务。...k"; 15 $query = "insert into aa (a,w) values('$i','$temp')"; 16 $sql->exec($query); 17 } 18...19 /** 下面的注释君请自行开启看效果 */ 20 //$sql->rollBack(); /** 回滚的话,上面的所有insert不会被执行 */ 21 //$sql->commit();.../** 不commit提交的话,上面的insert也不会被执行 */ 22 23 /** select 操作不用commit也可以直接使用 结果集 */ 24 /* 25 $result = $sql
Let’s start with a quick overview. What is IBM BigInsights? ?..., which is a distribution of open source Hadoop that includes the latest and most stable components one...Hadoop is one of the most flexible and at present, best technologies to analyze data in a cost-efficient...One of the most important is Big SQL, which is a fully ANSI SQL compliant MPP spread across Hadoop....HDFS or HBase or Hive and presents a familiar SQL interface that anyone familiar with SQL can use to query
package com.test.arithmetic; import java.util.Arrays; /** * Two point go together, small is left and big...* Thus the first meet will separate the array to half small and half big....(first < last) { source[first] = source[last]; first++; //The first one...has already been sorted, move to the next one. }//else first = last, that is the same one...j--; } else { i++; } } /** * 关键数据放到
目录 查看SQL执行频率 定位低效率执行SQL 定位低效率执行SQL-慢查询日志 定位低效率执行SQL-show processlist 查看SQL执行频率 MySQL 客户端连接成功后,通过...通 过查看状态信息可以查看对当前数据库的主要操作类型。...show session status like 'Com_______'; -- 查看当前会话统计结果 show global status like 'Com_______'; -- 查看自数据库上次启动至今统计结果...定位低效率执行SQL-慢查询日志 -- 查看慢日志配置信息 show variables like '%slow_query_log%’; -- 开启慢日志查询 set global slow_query_log...如果不是root,这个命令就只显示用户权限范围的sql语句 3) host列,显示这个语句是从哪个ip的哪个端口上发的,可以用来跟踪出现问题语句的用户 4) db列,显示这个进程目前连接的是哪个数据库
) { // $query->sql // $query->bindings // $query->time })...App\Http\Controllers; use App\User; class UserController extends Controller { public function one...return User::where("id", 1)->first(); // 在控制器执行查询方法 } } 注册路由 // file: routes/web.php $router->get('/one...', "UserController@one"); // 定义访问路由 最后别忘了开启DB功能以及填写数据库配置(这一段大家肯定都会,我就不贴代码了)。..."sql-" . date("Ymd") . ".log"; // 定义输出的日志路径ß } /** * Handle the event.
无论你是尝试优化电子商务搜索,构建最优的检索增强生成(RAG)应用,还是在数百万学术论文中进行基于问答的搜索,你可能都意识到在搜索引擎中准确优化文档排名是多么具有挑战性。..."multi_match": { "query": "the quick brown fox", "fields": ["title...": ["title", "content"], "query": "the quick brown fox" } }, "rescore": { "learning_to_rank...": { "model_id": "ltr-model-xgboost", "params": { "query_text": "the quick brown fox...无论你是在为电子商务平台配置搜索相关性而苦恼,还是希望改进RAG应用的上下文相关性,或者只是对提升现有搜索引擎性能感到好奇,都应该认真考虑LTR。
处理方法 3.1 同时存在.frm 和.ibd名称相同的文件 如果 #sql-*.ibd 和 #sql-*.frm两个文件都存在数据目录里的话,可以直接drop table。...a) 创建一张与#sql-ib1516-2335726735相同的表 root@testdb 08:47:35>create table company20191216 like company; Query...company20191216.frm \#sql-ib1516-2335726735.frm c) 删除表 因为上一步拷贝时使用-p的方式,即权限和原文件权限一致,属主及group均为mysql,因此可以直接在数据库里读取删除...root@testdb 08:49:54>drop table `#mysql50##sql-ib1516-2335726735`; Query OK, 0 rows affected (6.65 sec...\#sql-ib1570-121877015.frm b) 删除表 root@testdb 01:41:06>DROP TABLE `#mysql50##sql-ib1570-121877015`; Query
elasticsearch升级到7.x;改动不小,命令从头再捋一遍; PS:感叹elasticsearch在搜索和大数据聚合上面做的了不起的工作!...就像docker重新唤醒容器技术一样,elasticsearch在Lucene之上的构建为个人数据分析和企业数据梳理开创新时代。 如果有条件,我是极为愿意买入他们的股票的。...": { "query": "quick fox", "slop": 1 } } } }...": { "match": { "title": { "query": "quick brown dog", "minimum_should_match...5 6 7 8 9 PUT /my_index { "settings": { ... any settings ... }, "mappings": { "type_one
The lingua franca of data analysis》,介绍了SQL、关系型数据库的基础知识,包括发展历史、SELECT、JOIN、存储过程等,虽然是英文,但单词较简单,算科普了。...Older hierarchical databases only allow a record to belong to one set....There were two big reasons: ease of development and portability....I didn’t think either one mattered much in 1980 compared to performance and memory requirements, but...SQL reference Microsoft SQL Server technical documentation Oracle Database SQL reference SQL commands quick
to as DynamIQ big.LITTLE....performance Although UX is constantly changing over time, due to the evolving usage of applications, one...However, as the mobile space is quick to remind us, thermal budgets limit the amount of performance...To overcome this, one of the techniques that big.LITTLE systems rely on is Dynamic Voltage and Frequency...Having said that, it is worth remembering that big.LITTLE is just one of the many supported features
"analyzer": "ik_max_word", "search_analyzer": "ik_max_word" } } } (4)插入数据..."query": { "match" : { "title": { "query": "quick brown fox"...coerce https://www.elastic.co/guide/en/elasticsearch/reference/6.1/coerce.html#coerce coerce属性用于清除脏数据...整型数字5有可能会被写成字符串“5”或者浮点数5.0.coerce属性可以用来清除脏数据: 字符串会被强制转换为整数 浮点数被强制转换为整数 【例子】 (1)重新创建my_index DELETE...给一个字段索引不合适的数据类型发生异常,导致整个文档索引失败。如果ignore_malformed参数设为true,异常会被忽略,出异常的字段不会被索引,其它字段正常索引。
"default_field" : "content", "query" : "(new york city) OR (big apple)" } }} qquery_string...的minimum_should_match lenient 是否忽略由于数据类型不匹配引起的异常,默认为false time_zone 时区应用于与日期相关的任何范围查询。...在关系型数据库中前置通配符(" ab"),这种查询是不支持索引查询的,在es中同样如此,需要遍历索引中所有词根,可以通过allow_leading_wildcard=false来禁用这种查询。...例如针对查询字符串"quick^2 fox",表明quick这个词根的重要性比fox重要2倍。...例如查询字符串“quick brown +fox -news”表示的含义是: 1、fox词根必须存在。 2、news词根必须不存在。 3、quick brown 可选。
The goal of seaborn, however, is to make exploring a dataset through visualization quick and easy, as...seaborn的目标是通过可视化快速轻松地探索数据集,因为这样做与通过统计表探索数据集一样重要(如果不是更重要的话)。...tips) sns.lmplot(x="total_bill", y="tip", data=tips) It’s possible to fit a linear regression when one...案例3-y值为离散值的线性拟合-参数logistic tips["big_tip"] = (tips.tip / tips.total_bill) > .15 print(tips.head()) When...", data=tips, y_jitter=.03) sns.lmplot(x="total_bill", y="big_tip", data=tips,logistic=True, y_jitter
Django developers state the applications are it's strangely quick, secure, adaptable and flexible....Development Frameworks in 2019" Spring Spring is the most famous application advancement framework for big...Spring helps in making basic, convenient, quick and adaptable JVM-based frameworks and applications....Express encourages the quick improvement of Node.js based Web applications....Express is likewise one significant segment of the MEAN programming group.
注意空格 如a bcde0001 https://www.cnblogs.com/rainersha/p/11982846.html 前缀匹配 假设es中有条这样的数据,前缀匹配(不分词) C3D0-...因为前缀匹配,要扫描所有的倒排索引,假设“C3D0-KD345” 这条数据,并不能停止,因为不知道后面还有没有"C3"打头的。...都会扫描整个索引,性能很差 近似/短语匹配 java is my favourite programming language, and I also think spark is a very good big...": { "match_phrase": { "title": { "query": "java spark", "slop": 1 } } } } “slop”的含义 query...=3,qui uic ick ngram length=4,quic uick ngram length=5,quick 什么是edge ngram quick,anchor首字母后进行ngram
调用ZBlog网站今日发布文章总数需要自行写一个函数查询数据库实现,方法如下: 在主题的”include.php“文件里面复制粘贴如下函数: function get_todayArticleNum...(){ global $zbp; $db = $zbp->db->sql->get(); $sql = $db->select('zbp_post')->count('log_id', 'num'...log_PostTime>UNIX_TIMESTAMP(CAST(SYSDATE()AS DATE))')))->sql; $result = GetValueInArrayByCurrent($zbp->db->Query
他告诉《电子商务时报》:现在的趋势是,在亚马逊吞噬这一切之前,尽可能多地获取资金。...Target 在流行的 Xbox One S 1tb Minecraft 捆绑包上提供黑色星期五交易。...这些销售中相当一部分将是电子商务交易。 总部位于伦敦的品牌制造商和零售商的数据、见解和咨询服务机构,负责全球高管教育的副总裁 Chris Perry 指出,电子商务在零售总额中所占的比例一直在增长。...Big Inserts, Big Deals Some of the biggest Black Friday inserts have been released by Best Buy (52 pages...‘‘Black Friday and Cyber Monday are not the big milestones they were for retailers any longer,” Fisher