Tag: sql

Artificial intelligence (ai)

MYSQL performance tuning for the best 20+ tips

January 19, 2024

by Inaaya Barman

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Today, database operations are becoming a performance bottleneck for the entire application, especially for Web applications. Database performance is not just something for DBAs to...

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Logical Backup (Export) and Restore (import)

January 19, 2024

by Rachael Cole

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(1) logical backup and logical recovery. (2) between the database users to move objects. (4) implementation of table space move. (steal a small lazy graph...

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Understand SQL injection, XSS attack and resolution

January 19, 2024

by Robert Taylor

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1. What is SQL injection? The so-called SQL injection is to trick the server into executing malicious SQL commands by inserting SQL commands into Web...

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MYSQL GROUP BY groups multiple fields

January 19, 2024

by Elakshi Tak

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In the usual development tasks, we often use the MYSQL GROUP BY GROUP, used to obtain the statistics based on the GROUP field in the...

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SQL Practice 12- Ox customer network 61-65 questions

January 19, 2024

by Saira Mahal

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When calculating the ranking, as opposed to summing, rank the row in table A = how many rows precede the same row in table B....

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How to ensure the thread safety of SqlSession?

January 19, 2024

by Eshani Sule

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In Mybatis, SqlSession is the top-level interface provided for external calls. The implementation classes are DefaultSqlSession, SqlSessionManager and Mybatis - Spring provides the implementation of...

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Linux Operation and Maintenance (2) (14 questions)

January 19, 2024

by Dr. Owen James

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If the content is not correct, please give correction, thank you! 1. The kernel/var/log/messages log: nf_conntrack: tablefull, dropping packet, could you tell me what causes,...

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5 tips for SQL Optimization that you may not know

January 19, 2024

by Rebecca Harmon

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Click to pay attention to asynchronous books, top public number every day with you to share IT good books technology dry goods workplace knowledge to...

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GraphQL, an efficient, structured, and systematic alternative to REST

January 19, 2024

by Craig Jensen-Middleton

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When we think of Web apis, most of us think of REST (Representational State Transfer). You send the request to the URL of a particular...

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N offers in two months. How did I do that

January 19, 2024

by Nitara Kalla

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Beijing - three years of experience -Java. During the two months of golden three silver four (I also interviewed several companies in early May, mainly...

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Artificial intelligence (ai)

Good programmer big data parsing SQL optimization program refined solution ten

January 19, 2024

by Elakshi Tak

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Avoid using null values for columns in the WHERE clause. Otherwise, the engine will abandon the use of indexes and perform a full table scan....

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N offers in two months. How did I do that

January 19, 2024

by Wendy Haynes

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Beijing - three years of experience -Java. During the two months of golden three silver four (I also interviewed several companies in early May, mainly...

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Aliyun native database POLARDB pressure test report

January 19, 2024

by Ashley Lopez

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POLARDB is a next-generation relational database based on cloud computing architecture developed by The ApsaraDB database team of Ali Cloud. Its biggest feature is the...

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Mybatis – Plus mind map, so that mybatis- Plus is no longer difficult to understand

January 19, 2024

by Jose Armstrong

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Mybatis is an excellent persistence layer framework that supports customized SQL, stored procedures, and advanced mapping. MyBatis avoids almost all of the JDBC code and...

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SQL query speed tips, avoid locking database database code

January 19, 2024

by Jennifer Curtis

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Because the database space is still relatively immature, SQL developers on every platform are struggling, making the same mistakes over and over again. Of course,...

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Chapter 2 uses %UnitTest for unit tests

January 19, 2024

by Anthony Jackson

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Chapter 2 unit testing with %UnitTest the second part of this tutorial describes how to UnitTest InterSystems IRIS code using the %UnitTest package. After completing...

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Hadoop big data platform architecture DKhadoop details

January 19, 2024

by 許柏翰

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The era of big data has come. With the explosive growth of information, more and more industries are faced with the challenge of massive data...

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Getting Started with Apache Kylin 2 – Principles and Architecture

January 19, 2024

by Hayley Collis

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To put it simply, the core idea of Kylin is predictive calculation (using space to replace time), that is, to predict the measures that may...

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Linux server –mysql forgot password

January 19, 2024

by David Batchelar

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If you forget the root password, you will not be able to log in to mysql again. You can reset the root password by following...

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MySQL database development FAQ and optimization

January 19, 2024

by Debra Sampson

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Mysql database is a widely used relational database. Its small size, multi-processor support, open source and free features make it especially popular in small and...

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MySQL(2

January 19, 2024

by Brent Carroll

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Binary tree: Each parent is larger than the left child and smaller than the right child. Balanced binary tree: Binary tree based on each node...

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MySQL log maintenance policy

January 19, 2024

by Kiaan Dhawan

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If the slow_query_log=ON option is enabled, queries that take longer than long_query_time(10s by default) are logged (initial table lock time does not count as execution...

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Batch scan practices using SQLMapapi.py

January 19, 2024

by Kaia Cole-Brown

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Sqlmap is the magic tool of SQL injection probing, excellent probing function can let any user mining SQL injection without foundation. There are already 6...

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In complex business, import 300,000 pieces of data into Mysql

January 19, 2024

by George Kerr-Allen

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In addition, there are three tables under information_SCHEMA that make it easier to monitor current transactions and analyze possible problems :INNODB_TRX, INNODB_LOCKS, and INNODB_LOCK_WAITS (problem...

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Kylin storage Engine based on Druid

January 19, 2024

by Alyssa Mendoza

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About the author: Meituan big Data Engineer, Apache Kylin Committer, currently responsible for the platform construction of Meituan OLAP system (Kylin & Druid & Palo)....

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Artificial intelligence (ai)

Good programmer big data dry GOODS SQL optimization program refined solution ten

January 19, 2024

by Renee Hayre

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Avoid using null values for columns in the WHERE clause. Otherwise, the engine will abandon the use of indexes and perform a full table scan....

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MySQL several simple SQL optimization

January 19, 2024

by 金淑貞

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Recently, WHEN I was working on a project, I encountered some operations with a large amount of data, including a large number of CRUD operations....

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The core technology can’t be bought – write your own ORM framework

January 19, 2024

by 唐惠雯

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Java ORM framework on the open source market is not easy to use, so I spent a few days on my OrmKids, welcome to download...

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10 tips for making your database faster

January 19, 2024

by Leanne Russell

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The content of most websites is stored in a database and accessed by users on request. Databases are very fast, and there are many tricks...

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Artificial intelligence (ai)

Initial database and SQL

January 19, 2024

by Amber Mccormick

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A database is a collection of data which can be accessed efficiently and stored in a large amount of data by computer processing. This data...

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