mysql engine

Introduction MySQL is one of the most popular free open source programs in history. It is the backbone of the database for tens of thousands of websites, and it can be a powerful proof of the exponential growth of the Internet over the past 10 years

For MySQL databases, you must use the InnoDB engine if you want to use transactions and row-level locks. If you want to use Full-text indexing, you must use MyISAM. InnoDB's practicality, security, stability is higher but the efficiency than myisam

Recently, a lot of performance testing with Sysbench, also summed up its characteristics and usage and need to pay attention to matters. Sysbench is a multithreaded performance testing tool that can perform performance testing such as

HP layer to MySQL layer The PHP to the SQL component hierarchy is shown in the following illustration: Ext/mysqli and Ext/mysql are the client's extender libraries (library functions), which are extended libraries at the client-side scripting

MySQL Database interview SummarySeptember 04, 2017 00:11:40Hits: 151Combined with the online great God also have their own interview experience, collect the summary of MySQL interview questions, to facilitate their own preparation for the interview;

Left ear Mouse: https://coolshell.cn/articles/1846.htmlToday, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance

1. Optimize your query for query cachingMost MySQL servers have query caching turned on. This is one of the most effective ways to improve sex, and this is handled by the MySQL database engine. When many of the same queries are executed multiple

Why queries are slow Slow Query Basics: Optimizing data access Verifying that an application is retrieving a large amount of data that is more than needed usually means accessing too many rows, but sometimes it may be too many columns

First, IntroductionDefault lock level for MySQL engine:MyISAM and memory Use table-level locks (table-level locking).The BDB uses page locks (page-level locking) or table-level locks, which are page locks by default.InnoDB supports row-level locks

1. Optimize your query for query cachingMost MySQL servers have query caching turned on. This is one of the most effective ways to improve sex, and this is handled by the MySQL database engine. When many of the same queries are executed multiple

1MARIADB Query CacheThe data in the cache is in open source form, in the form of key-value pairs (k/v)Key: The hash value of the query statement;Value: Query result of query statement;The data in the cache is mainly through the comparison of the

Background:The author's source data a table about 7000多万条, data size 36G, index 6G, add up table space has 40g+, similar table has 4, a total of more than 200 millionDatabase MySQL, engine for InnoDB, version 5.7, server memory 256G, physical memory

I recently read a book about MySQL "MySQL must Know", the book only a few basic knowledge, but also basically covers all the MySQL knowledge points. The rest of the more advanced also only on the basis of expansion or optimization, after reading

This article comes from the Database kernel column In the previous article, we introduced the implementation of MGR for data reliability, availability, and consistency. Simply put, MGR uses multiple replicas based on the Paxos protocol to achieve

Optimizing GROUP BY statementsBy default, MySQL sorts all group by Col1,col2, ..... The method of querying is like specifying an order by Col1,col2 in a query .... If you explicitly include an ORDER BY clause that contains the same column, MySQL can

Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's

Just started to write MySQL statements more cumbersome, noisy, summed up a few points should be noted:1 note punctuation, when creating a table create table, the parentheses contain the contents of the "," number split open, the last statement does

Just started to write MySQL statements more cumbersome, noisy, summed up a few points should be noted:1 note punctuation, when creating a table create table, the parentheses contain the contents of the "," number split open, the last statement does

To create a table and insert a data statement:Mysql> CREATE TABLE salary (userid int,salary decimal (9,2));Query OK, 0 rows affected (0.11 sec)Mysql> INSERT into salary values (1,1000), (2,2000), (3,3000), (4,4000), (5,5000), (1,NULL);Query OK, 6

1. What is a relational database? What is a non-relational database?Relational database concepts: can be understood as a second-dimensional table, each relationship has a relationship name, is usually said table name, refers to the love of the