| IT |
気になる、記になる… |
｢Xbox ワイヤレスコントローラー｣の環境に配慮した新モデル｢リミックス特別エディション｣は本日発売 |
https://taisy0.com/2023/04/18/170759.html
|
microsoft |
2023-04-18 03:15:36 |
| IT |
気になる、記になる… |
Appleの整備済み商品情報 2023/4/18 |
https://taisy0.com/2023/04/18/170757.html
|
apple |
2023-04-18 03:12:06 |
| IT |
ITmedia 総合記事一覧 |
[ITmedia PC USER] 日本HP、GPU4基構成にも対応したハイエンドデスクトップWS「HP Z8 Fury G5」など12製品を投入 |
https://www.itmedia.co.jp/pcuser/articles/2304/18/news116.html
|
hpzfuryg |
2023-04-18 12:30:00 |
| IT |
ITmedia 総合記事一覧 |
[ITmedia Mobile] シャープが創業111周年イベント 生成AIを“しゃべる家電”に搭載へ |
https://www.itmedia.co.jp/mobile/articles/2304/18/news072.html
|
itmediamobile |
2023-04-18 12:30:00 |
| IT |
ITmedia 総合記事一覧 |
[ITmedia ビジネスオンライン] LEXUS、新型ミニバン「LM」世界初公開 「素に戻れる移動空間」テーマに全面刷新 |
https://www.itmedia.co.jp/business/articles/2304/18/news112.html
|
itmedia |
2023-04-18 12:30:00 |
| IT |
ITmedia 総合記事一覧 |
[ITmedia News] 「熱中症警戒アラート」26日から運用 去年は延べ889回 |
https://www.itmedia.co.jp/news/articles/2304/18/news115.html
|
itmedia |
2023-04-18 12:20:00 |
| IT |
ITmedia 総合記事一覧 |
[ITmedia News] 「不十分なクオリティーでライブ開催」──VTuberのイベントで前代未聞の声明 原因は運営の“準備不足” |
https://www.itmedia.co.jp/news/articles/2304/18/news113.html
|
itmedia |
2023-04-18 12:10:00 |
| TECH |
Techable（テッカブル） |
アウトドアでも使える！直径11cmの超小型プロジェクター「GeeMirroring」発売 |
https://techable.jp/archives/203458
|
mirror |
2023-04-18 03:00:18 |
| IT |
情報システムリーダーのためのIT情報専門サイト IT Leaders |
クラスメソッド、VMware Cloud on AWSを販売開始、オンプレミスからの移行支援も実施 | IT Leaders |
https://it.impress.co.jp/articles/-/24739
|
クラスメソッドは、同サービスの販売を開始するとともに、AWSへの移行支援なども提供する。 |
2023-04-18 12:38:00 |
| js |
JavaScriptタグが付けられた新着投稿 - Qiita |
input fileで同じファイルを連続で選ぶと@changeイベントが発火しない問題 |
https://qiita.com/rindou45/items/21a117b94dd4be3fdc39
|
change |
2023-04-18 12:06:01 |
| Git |
Gitタグが付けられた新着投稿 - Qiita |
巨大なリポジトリを、GitLab→GitHubに、LFSを使って、ちょっとずつpushする |
https://qiita.com/fkshom/items/4bf874760e2d777ab439
|
github |
2023-04-18 12:20:10 |
| Git |
Gitタグが付けられた新着投稿 - Qiita |
UnityのLibraryファイルがGitでコンフリクトするとき |
https://qiita.com/gakusei_programmer/items/e8066c9e3dc1d280584b
|
gitignore |
2023-04-18 12:05:24 |
| 技術ブログ |
Developers.IO |
FivetranのSnowflake Connectorを使ってSnowflake上のデータをBigQueryにロードしてみた |
https://dev.classmethod.jp/articles/fivetran-try-snowflake-connector/
|
bigquery |
2023-04-18 03:28:28 |
| 海外TECH |
DEV Community |
Why are relational databases useful🤷🏻♂️ |
https://dev.to/documatic/why-are-relational-databases-useful-307p
|
Why are relational databases useful ️In today s data driven world information is king From customer profiles to financial transactions every organization relies on data to make informed decisions and stay ahead of the competition But with data volumes growing at an unprecedented rate managing and analyzing all this information can quickly become overwhelming This is where relational databases come in Relational databases are designed to store data in a structured way with multiple tables that can be linked together using relationships This allows for more complex queries and data analysis making them an essential tool for businesses and organizations of all sizes In this article we will explore the key advantages of using relational databases and why they continue to be a vital tool for businesses of all sizes What is a relational database A relational database is a type of database that stores and organizes data in a structured way In a relational database data is organized into one or more tables each with a unique name and set of columns Each row in a table represents a single record and the columns represent the different attributes or characteristics of that record One of the key features of a relational database is that it allows for relationships between tables to be established This means that data can be linked together based on common values allowing for more complex queries and analysis For example a customer table might be linked to an orders table so that it s possible to see which customers have placed which orders Relational databases differ from other types of databases in that they are based on a mathematical model called relational algebra This model provides a formal way of representing and manipulating data which allows for efficient querying and data analysis Other types of databases such as NoSQL databases may use different data models that are optimized for specific types of data or use cases However relational databases remain the most commonly used type of database due to their flexibility and versatility in handling a wide range of data and applications Some popular relational database management systemsOracle Oracle Database is a widely used relational database management system developed by Oracle Corporation It is known for its scalability security and high availability features MySQL MySQL is an open source relational database management system that is widely used in web applications It is known for its speed ease of use and low cost Microsoft SQL Server Microsoft SQL Server is a relational database management system developed by Microsoft It is used for a wide range of applications including business intelligence data warehousing and e commerce PostgreSQL PostgreSQL is an open source relational database management system that is known for its robustness scalability and advanced features such as support for JSON and geospatial data IBM DB IBM DB is a relational database management system developed by IBM It is used in a variety of applications including financial services healthcare and government These are just a few examples of the many relational database management systems available today Each system has its own strengths and weaknesses so it s important to choose the one that best fits the needs of your specific application Advantages of relational databasesRelational databases offer many advantages over other types of databases Some of the main advantages include Data consistency In a relational database data is organized into tables with defined relationships between them This ensures that the data is consistent across the entire database For example if a customer changes their address this change will be reflected in all of the tables that are linked to the customer table such as the orders table or the invoices table Data integrity Relational databases use constraints to ensure that data is accurate and complete For example a primary key constraint might be used to ensure that each record in a table has a unique identifier while a foreign key constraint might be used to ensure that a record in one table corresponds to a record in another table This helps to prevent data errors and inconsistencies Data security Relational databases provide robust security features to protect sensitive data Access controls can be set up to restrict who can view modify or delete data and encryption can be used to protect data at rest and in transit Scalability Relational databases are designed to handle large amounts of data and can be scaled up or down as needed This allows businesses to grow and adapt to changing needs without having to worry about outgrowing their database Query flexibility Relational databases allow for complex queries to be run on the data which can help businesses gain insights and make informed decisions For example a business might run a query to find all customers who have made a purchase in the past month and live in a certain geographic region Overall the advantages of using a relational database are many and varied and they have made these types of databases a cornerstone of modern data management Relational database structureRelational databases are structured using a table based system where data is organized into tables consisting of rows and columns Each table in the database represents a particular type of entity or concept such as customers products or orders Columns in a table represent the attributes or properties of the entity while rows represent the individual instances or records of that entity For example a customer table might include columns for the customer s name address email and phone number with each row representing a different customer In a relational database these tables are linked together through the use of keys which are unique identifiers that help establish relationships between tables Primary keys are used to uniquely identify each record in a table while foreign keys are used to link records in one table to those in another table By structuring data in this way relational databases provide a powerful and flexible way to manage complex data sets and ensure data consistency and integrity Relational model and data consistencyThe relational model is based on the concept of data normalization which involves organizing data into tables in a way that minimizes redundancy and ensures data consistency This means that each piece of data is stored in only one place and all related data is stored together in the same table For example in a customer table each customer s name and contact information would only be stored once even if the customer has placed multiple orders Instead the orders would be stored in a separate table that is linked to the customer table through a foreign key By structuring data in this way the relational model helps ensure that data is consistent across the database Any changes made to a particular piece of data only need to be made in one place and those changes will automatically propagate to any other parts of the database that use that data In addition the use of constraints and rules in the relational model helps ensure data consistency by preventing invalid data from being entered into the database For example a constraint might be set up to ensure that a customer s email address is entered in a specific format or that a certain field cannot be left blank Overall the use of the relational model helps ensure data consistency and integrity which is essential for making accurate business decisions based on the data stored in a database ACID properties and RDBMSThe ACID properties Atomicity Consistency Isolation and Durability are a set of principles that are widely used in the design of transactional systems They are particularly relevant in relational database management systems RDBMS where the ACID properties are used to ensure data consistency reliability and integrity Atomicity refers to the idea that transactions must be treated as a single indivisible unit This means that if any part of a transaction fails the entire transaction must be rolled back and no partial changes should be saved Consistency refers to the idea that a transaction must leave the database in a valid state This means that any constraints or rules enforced by the database must be maintained and any data changes made during the transaction must be consistent with the database schema Isolation refers to the idea that concurrent transactions must be executed independently of each other This means that transactions should not interfere with each other and the database should be protected against race conditions deadlocks and other concurrency related issues Durability refers to the idea that once a transaction is committed its changes should be permanent and survive any subsequent system failures This means that changes made to the database during a transaction should be recorded in a durable way such as through logging or journaling so that they can be restored in the event of a system failure Commitment and atomicityCommitment and atomicity are two important concepts in relational database management systems that help ensure data consistency and integrity Commitment refers to the concept of ensuring that a transaction is either fully completed or fully rolled back A transaction is a series of operations performed on the database such as adding or updating records In a relational database transactions are typically executed as a single unit of work meaning that either all the operations in the transaction are completed successfully or none of them are Atomicity is the property of a transaction that ensures that all the operations in the transaction are treated as a single indivisible unit This means that if any part of the transaction fails the entire transaction is rolled back and the database is returned to its previous state Together commitment and atomicity ensure that transactions are executed in a reliable and consistent manner If a transaction cannot be completed successfully for any reason the database is returned to its previous state and no partial changes are saved This helps ensure data integrity and consistency even in the event of errors or system failures Overall commitment and atomicity are important concepts in relational database management systems helping to ensure that data is handled in a reliable and consistent manner Challenges of using Relational DatabasesDespite their many advantages relational databases also present a number of challenges that businesses must be aware of when using these systems Performance issues Relational databases can experience performance issues when dealing with large amounts of data or complex queries As the database grows the time it takes to execute queries can increase which can impact application performance In some cases database administrators may need to optimize queries or add additional hardware to improve performance Data scaling problems While relational databases are designed to handle large amounts of data they can still experience scaling problems when dealing with very large datasets This can result in slow queries or even database crashes To address this challenge businesses may need to consider using distributed databases or other scaling solutions Complex data modeling Designing a relational database can be a complex process that requires careful consideration of data relationships and table structures If the data model is not well designed it can lead to issues with data consistency and integrity Additionally changes to the data model can be difficult and time consuming to implement Cost Relational databases can be expensive to set up and maintain Licensing fees hardware costs and staffing costs can all add up over time making it challenging for businesses with limited resources to implement and maintain a relational database Vendor lock in Businesses that choose to use a particular relational database management system may become locked into that vendor s technology stack making it difficult to switch to a different database system in the future While these challenges may be significant they can often be addressed through careful planning optimization and ongoing maintenance ConclusionRelational databases are an important tool in modern data management providing a structured approach to organizing and managing data They offer advantages such as data consistency integrity and security but also come with challenges such as performance issues and complex data modeling Nonetheless the ACID properties provide a framework for ensuring data reliability and integrity in relational database management systems Overall relational databases have revolutionized modern data management and will continue to be an essential tool for organizations managing large amounts of data Happy Hacking Bentil hereIf you found this article helpful in understanding the importance and benefits of relational databases please feel free to share it with others who might benefit from it If you have any experience using relational databases or have any questions please leave a comment below Your insights and feedback could be valuable to others who are considering using relational databases in their projects Thank you for reading |
2023-04-18 03:50:10 |
| 金融 |
JPX マーケットニュース |
[東証]新規上場日の初値決定前の気配運用について：エキサイトホールディングス（株） |
https://www.jpx.co.jp/news/1031/20230418-01.html
|
新規上場 |
2023-04-18 13:00:00 |
| 海外ニュース |
Japan Times latest articles |
Self-Defense Forces recover two more bodies from crashed helicopter |
https://www.japantimes.co.jp/news/2023/04/18/national/okinawa-helicopter-bodies/
|
Self Defense Forces recover two more bodies from crashed helicopterOne body remains to be retrieved after the remains of five people were found Sunday together with part of the UH JA helicopter that disappeared with |
2023-04-18 12:45:49 |
| 海外ニュース |
Japan Times latest articles |
Japan and South Korea resume security dialogue after five years |
https://www.japantimes.co.jp/news/2023/04/18/national/japan-south-korea-security-dialogue-resumes/
|
Japan and South Korea resume security dialogue after five yearsIn March this year Prime Minister Fumio Kishida and South Korean President Moon Suk yeol agreed to resume the security dialogue at an early date |
2023-04-18 12:28:06 |
| ニュース |
BBC News - Home |
Ukraine war: US accuses Lula of parroting propaganda |
https://www.bbc.co.uk/news/world-latin-america-65307553?at_medium=RSS&at_campaign=KARANGA
|
ukraine |
2023-04-18 03:18:06 |
| ニュース |
BBC News - Home |
Plan to ban 'menacing' machetes and zombie knives |
https://www.bbc.co.uk/news/uk-65303502?at_medium=RSS&at_campaign=KARANGA
|
government |
2023-04-18 03:37:15 |
| ビジネス |
ダイヤモンド・オンライン - 新着記事 |
中国GDP、1-3月期は前年比4.5％増へ加速 コロナ規制解除などで - WSJ発 |
https://diamond.jp/articles/-/321531
|
解除 |
2023-04-18 12:11:00 |
| ビジネス |
東洋経済オンライン |
｢限界でもやれ｣頑張り方間違えたコンサルの盲点 クライアントが真に求める｢最適解｣を導く方法 | リーダーシップ・教養・資格・スキル | 東洋経済オンライン |
https://toyokeizai.net/articles/-/665588?utm_source=rss&utm_medium=http&utm_campaign=link_back
|
東洋経済オンライン |
2023-04-18 13:00:00 |
| マーケティング |
MarkeZine |
Z世代トレンドランキング総合1位はTikTok、2019年9月以降で7回の3位入り【LINE調査】 |
http://markezine.jp/article/detail/41931
|
tiktok |
2023-04-18 12:30:00 |
| マーケティング |
MarkeZine |
Z世代に人気のタレント、男性1位は「二宮和也」／女性は「橋本環奈」がトップ【アーキテクト調査】 |
http://markezine.jp/article/detail/41999
|
二宮和也 |
2023-04-18 12:15:00 |
| IT |
週刊アスキー |
丸の内でヌン活！ アマン東京で「ハーブガーデン アフタヌーンティー」&「グリーンティー フォレ デセール」を開催中 |
https://weekly.ascii.jp/elem/000/004/133/4133295/
|
開催中 |
2023-04-18 12:40:00 |
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