addition mysql

Original: http://bbs.landingbj.com/t-0-243071-1.htmlMySQL Index overviewAll MySQL column types can be indexed. Using indexes on related columns is the best way to improve the performance of select operations. Defines the maximum number of indexes

#一. OverviewThe > database locking mechanism simply means that the database is designed to ensure the consistency of the data and to make the various shared resources be ordered by concurrent access. For any kind of database need to have a

A lock is a mechanism by which a computer coordinates multiple processes or a purely thread concurrently accessing a resource. in a database, data is a resource that is shared by many users in addition to the contention of traditional computing

Reference Source: http://www.cnblogs.com/zhyunfe/p/6209074.html1. Select the most applicable field propertiesMySQL is good at supporting large data volumes, but in general, the smaller the tables in the database, the faster queries are executed on

ways to optimize your database1. Select the most applicable field properties MySQL is good at supporting large data volumes, but in general, the smaller the tables in the database, the faster queries are executed on it. Therefore, in order to

There are always problems when installing MySQL, and each reinstallation will take a lot of time to troubleshoot. In fact, there are a lot of related articles on the Internet, but many of them only talk about the method, but did not tell the details

1.1 Get the current date + time (date + times) function: Now ()In addition to the now () function to get the current datetime, MySQL has the following function:Current_timestamp () Current_timestampLocalTime () localtimeLocaltimestamp ()

There are several types of data that represent dates and times in MySQL. Where year represents the years, date represents the dates, time represents the times, and datetime and timestamp represent dates and practices. Their comparison is as

1. Select the appropriate field properties. For example, when you define a postal code field, if you set it to char (255), you obviously add unnecessary space to the database, and even this type of varchar is redundant, because char (6) can do a

Forwarding Original address: http://www.cnblogs.com/hanzhao1987/p/6100096.htmlMySQL Benefits:Easy to use, low cost, easy to expand, replication leadingThe life cycle of MySQL:MySQL server listener 3306 port > Authenticate Access user > create MySQL

Original address: http://www.cnblogs.com/lyroge/p/3837886.htmlMySQL single-table million data record paging performance optimizationbackground:One of their own site, because the single-table data record up to 1 million, resulting in slow data access,

First, MySQL gets the current date time function1.1 Get the current date + time (date + times) function: Now ()Mysql> Select Now (); +---------------------+| Now () |+---------------------+| 2015-01-22 22:20:46

1. Select the most applicable field propertiesMySQL is good at supporting large data volumes, but in general, the smaller the tables in the database, the faster queries are executed on it. Therefore, in order to achieve better performance when

---Method 1: Directly use SQL statements provided by the database---statement style: In MySQL, you can use the following method: SELECT * from table name LIMIT m,n---adaptation scenario: suitable for low data volumes (tuple hundred/Thousand)---cause/

First, MySQL gets the current date time function 1.1 Get the current date + time (date + times) function: Now () Mysql> Select Now (); +---------------------+ | Now () | +---------------------+ | 2008-08-08 22:20:46 | +---------------------+ In

Semi-consistent IntroductionFor those familiar with MySQL, or have seen InnoDB source of friends, may have heard of a fresh noun: semi-consistent read. What is semi-consistent read? The following paragraph, excerpt from the semi-consistent read

Content from the book "Mysql++ Database development, optimization and Management Maintenance + 2nd edition + Tang Hanming"Principles for designing indexes1. The index column of the search is not necessarily the column you want to select. In other

1. Select the most applicable field propertiesMySQL is good at supporting large data volumes, but in general, the smaller the tables in the database, the faster queries are executed on it. Therefore, in order to achieve better performance when

BackgroundInnoDB buffer pool As the most important cache of InnoDB, its cache hit rate will directly affect the performance of the database. Therefore, changes in the database, such as restart, primary and standby switch instance migration, and so

Original link:MySQL time and date function-Redfox-Blog ParkHttp://www.cnblogs.com/redfox241/archive/2009/07/23/1529092.html--------------------------------------------------------------------------------------------------------------- ---------------