MySQL

The last time I configured MySQL for master-slave replication or the beginning of the year, I did not expect to start using MySQL now. Words don't say much, get to the pointMaster-slave setting up the Environment:

Query Cache principleWhen MySQL receives a select type of query, MySQL hashes the query to get a hash value and then matches the hash value to the query cache, if there is no match, The hash value is stored in a hash list, and the result set of

Original: C language MySQL API1.mysql_affected_rows ()//returns the number of rows that were changed/deleted/inserted by the last update, delete, or insert query.2.mysql_autocommit ()//Toggle autocommit mode, ON/off.3.mysql_change_user ()//change

Restore a database: mysql-h localhost-u root-p123456 WwwBacking up a database: mysqldump-h localhost-u root-p123456 www > d:/www2008-2-26.sqlThe following is a test in the program$command = "Mysqldump--opt-h $dbhost-u $dbuser-P $dbpass $dbname |

System InformationApplication logic is to query data with C3P0 to database and HTTP to return JSON data1 Initial test results prior to tuning JMeter test result No. Type Original Data bigger 1

1. Creating a stored procedure with a cursorSQL creation:Create PROCEDURE daily_max_avg_online () begindeclare max_online int;declare avg_online int;declare time TIMESTAMP; Declare cur cursor FOR select MAX (Online_num), round (avg (online_num)),

In the JSP page according to the posting time of the forum post to query the post record, front JSP page code is as follows: Please select time: The Java code in the background is as follows:Private list forumpostlist; Private String posttime;

2 cases of MySQL Server 5.6 Fault HandlingNovember 4, 2014, Mysql-server failed after upgrading from 5.1 to 5.6 on 117.79.133.132 server############################################################################### Accident

Write in front: indexes have a critical impact on the speed of queries, and understanding indexes is also a starting point for database Performance tuning. Consider the following scenario, assuming that a table in the database has 10^6 records, the

127.0.0.1 and localhost can connect to the MySQL server, but the corresponding IP is not, and error:Can ' t connect to MySQL server on "10.0.73.25" (111)The following may be the cause:1. Network does not pass: Ping 10.0.73.25 found can ping, exclude

Mysql:After upgrading the Mac to osx10.9, MySQL server can not be used, on the Internet to find the data said OSX 10.9 under the server software has been a lot of upgrades, so re-download the appropriate 10.9 MySQL server:

The following is a detailed description of the use of MySQL ifnull function, for your reference to learn, if you have encountered similar problems in MySQL ifnull function use, may wish to see.MYSQL ifnull (EXPR1,EXPR2)If EXPR1 is not Null,ifnull ()

Just want to study how to back up the database, share a PHP implementation of MySQL backup class libraryquery ("SHOW CREATE TABLE $table"); $create = $db->fetch_row ($createtable); $tabledump. = $create [1]. "; N\n "; return

The event scheduler in MySQL can periodically increase, delete, and execute operations on the database, which is equivalent to temporary triggers in the database, as with the execution plan tasks in the Linux system, which can greatly reduce the

MYSQL Memory Table UsageThe memory table uses a hash index to keep the data in memory, so it has a very fast speed and is suitable for caching small-to-medium databases, but with some restrictions on usage, the following are some of the feelings

http://tech.ddvip.com/2009-01/1231392775105351.html MySQL: Unix_timestamp (), Unix_timestamp (date)If no parameter is called, returns a Unix timestamp (the number of seconds after the ' 1970-01-01 00:00:00 ' GMT) as an unsigned integer. If you call

Environment configuration1. Project--Properties->vc++ directory,Add include directory: C:\Program files\mysql\mysql Server 5.7\includeAdd Library directory: C:\Program files\mysql\mysql Server 5.7\lib2. Linker-Input: Add Libmysql.lib3. Place

The mysqli extension is missing. Check the PHP configuration. A new lamp is installed and you want to open the database. The following error occurs: PhpMyAdmin-the error message "mysqli extension" is missing. Check the PHP configuration. Class =

MySQLroot user forgot password solution (security mode, password modification methods) 1. Disable running MySQL2. Run the following command to start the Security Mode of MySQL: mysqld --skip-grant-tables Or mysqld-nd --skip-grant-tables 3. log on to

Stable mysql version selection and download instructions)How to select a new stable mysql version can be divided into Alpha, Beta, and GA. GA is a stable version officially released by mysql. You can download Mysql from the official website at http:/