Mysql M

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Migrating from MySQL to Mariadb (CentOS)

Here's an excerpt of the background, followed by a record of the operations I migrated from MySQL 5.5.31 to mariadb 5.5.31 on CentOS 6.4.   Finally, I found a better way to migrate. 1. Background introduction MySQL is the world's most popular open source relational database. 2008, Sun acquired MySQL. Then, in 2010, Oracle bought Sun, and MySQL fell into Oracle's hands. Oracl ...

MySQL and PostgreSQL: which open source database to choose? Which one is better?

Naresh Kumar is a software engineer and enthusiastic blogger, passionate and interested in programming and new things.   Recently, Naresh wrote a blog, the open source world's two most common database MySQL and PostgreSQL characteristics of the detailed analysis and comparison. If you're going to choose a free, open source database for your project, you may be hesitant between MySQL and PostgreSQL. MySQL and PostgreSQL are free, open source, powerful, and feature-rich databases ...

Detailed MySQL database resources inadequate solution to the problem

A few days, in the management of the system encountered a strange problem, today have the opportunity to install the MySQL environment to reproduce the problem, because it is not the most primitive environment, so may not be able to fully reproduce, I can only try to reproduce the key The problem .. I think this issue is a bit special, so in this probably recall the scene under the circumstances .. Work, the implementation of a su & ndash; mysql command, encountered such an error .. view sourceprint? 1 [root @dbmain ~ ...

3 Steps to teach you a key automatic backup MySQL database method

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest Cloud host technology lobby backup MySQL has always been a headache for many friends, especially in a time period backup,   Today, I will teach you how to use a key to backup MySQL database files every day. 1. First set up batch file, save the following code as a. bat file, preferably in English. ...

String Pattern Matching in MySQL

MySQL provides standard SQL pattern matching and a format based on pattern matching of extended regular expressions like Unix utilities such as vi, grep and sed. Standard SQL Pattern Matching SQL pattern matching allows you to match any single character with "_" and "%" with any number of characters (including zero characters). In MySQL, the default SQL mode is case-insensitive. Here are some examples. Note that you can not use = or! = While you are using SQL mode, and use LIKE or NOT LIKE to compare operators ...

mysql modify table / field add / delete table index

mysql tutorial to modify the table / field to add / delete table index create table test (blob_col blob, index (blob_col (10))); In mysql 5.1, myisam and innodb table prefix can reach 1000 bytes long. Note that the prefix limit should be measured in bytes, while the prefix length in the create table statement is interpreted as the number of characters. Must be considered when specifying the prefix length for columns that use multi-byte character sets. ...

MySQL limit optimization method for large data paging

MySQL optimization is very important. The most common and most needed optimization is limit.   The limit of MySQL brings great convenience to paging, but when the amount of data is large, the performance of limit is reduced dramatically. The same is 10 data select * FROM Yanxue8_visit limit 10000,10 and select * from Yanxue8_visit limit 0,10 is not a quantitative level ...

mysql date and time and conversion time stamp function

The formula for converting timestamps using execl is: Code: = (xxxxxxxxxx + 8 * 3600) / 86400 + 70 * 365 + 19 Explain the timestamp syntax using mysql tutorial statements Example: select from_unixtime (1234567890, '% y-% m -% d% h:% i:% s') Attached: In mysql, a time field storage type is int (11), how to convert into a type of character, such as store as 13270655222, ...

Mysql automatic backup script Linux

Script on /home/user/mysql_backup.sh crontab # crontab -l # m dom dom dow downgrade 28 16 * * * / home / user / m ...

Some commonly used MySQL command to collect and organize

MySQL command line is to learn the MySQL database must master the knowledge, here is to introduce you to 10 easy-to-use MySQL command line, I hope you learn MySQL command line can help. 1, the structure of the display data table: mysql> DESCRIBE table name; (DESC table name) 2, the establishment of data tables: mysql> USE library name; / / enter the database mysql> CREATE TABLE table name (field name VA ...

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