MySQL

Linux as the operating system, Apache as a Web server, MySQL as a database, PHP as a server-side scripting interpreter. Since these four software are free or open source software, use this without spending a penny (except labor costs) can establish

MySQL log-records operations and information during MySQL database operationLog role(1) When the database has been accidentally damaged, you can query the cause of the error through the log file.(2) Using log files for data recoveryLog

DBCP (database connection pool), DB connection pool. is a Java Connection pool project on Apache and a connection pool component used by Tomcat. Use of DBCP alone requires 2 packages: Commons-dbcp.jar, Commons-pool.jar because establishing a

The example of creating a temporary table in a stored procedure in MySQL is a good example of learning MySQL temp table operations.Operation Steps:Mysql>mysql>mysql> CREATE TABLE Employee (//creating normal table, id int, first_name varc HAR (),

1. To optimize the query, avoid full-table scanning as far as possible, and first consider establishing an index on the columns involved in the Where and order by.2. You should try to avoid null values in the WHERE clause, otherwise it will cause

Starting with MySQL5.5, MySQL supports semi-synchronous replication in the form of plugins. How to understand the semi-synchronous? First, let's look at the asynchronous, fully synchronous concept.Asynchronous replication (asynchronous

Author:flymorn Source: Easy to floatcategories:php Programming Posttime:2011-1-14 15:35:07Text: Recently, due to the need to study the MySQL random extraction implementation method. For example, to randomly extract a

DAYOFWEEK (date)The return date is the day of the week (1= Sunday, 2 = Monday,...... 7= Saturday, ODBC Standard)Mysql> Select DAYOFWEEK (' 1998-02-03 ');3WEEKDAY (date)The return date is the day of the week (0= Monday, 1 = Tuesday,...... 6=

before you say a question, talk about table MySQL numeric type int. As is known to all, MySQL numeric type int accounts for four bytes, signed, unsigned shaped storage range, signed range-2147483648-2127483647, unsigned range is 0-4294967295 (2^32

setattribute (pdo::attr_errmode,pdo::errmode_exception);  //setattribute   pdo object Methods, PDO:: Indicates that these variables are part of the PDO we use, not the PHP language itself built-in variables. You want to set the PDO property

Use Init-connect and Binlog in MySQL to implement user action tracking records 2014-07-28 20:55:38Category: MySQLPreface:Test environment inexplicably have a few important data is deleted, because in Binlog only see is the public account deleted,

Why MySQL is garbledTo understand why garbled, we have to understand: from the client initiated the request, to the MySQL storage data, and the next time from the table to retrieve the client's process, which links will have encoding/decoding

---restore content starts---If MySQL is not used for a long time, forget the password, how to solve???1. First, you need to close the MySQL-related service process in Task Manager2.cmd, enter the DOS window and go to the bin directory of the MySQL

This article explains in detail the MySQL order by rand () efficiency optimization scheme, and gives the optimization of the thinking process, is a rare MySQL order by rand () efficiency of the United States.Recently, due to the need for a general

MySQL "root" user default state is no password , so in PHP you can use mysql_connect ("localhost", "root", "") to connect to the MySQL server;If you want to set a password for the "root" user in MySQL (for example: the native MySQL password is 123456

Problem: MySQL insert data with Chinese characters appearing incorrect string value errorDescription: A part of CMD that directly knocks the code into the data tip is truncated as: ERROR 1366 (HY000): Incorrect string value is generally a coding

Success Loading Mysql driver!Mon Apr 15:43:00 CST warn:establishing SSL connection without server ' s identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must is established by default

What is a long connection?In fact, a long connection is relative to the usual short connection, that is, long time to maintain the client and the server connection state.The usual short connection operation steps are:Connect-"data transfer-" close

# Restore a database from a dump. sql fileMysql-h mdbec-db1-u Wpadmin-pwpadminpass wpdb # Percona XtraDB Cluster Start commands/etc/init.d/mysql bootstrap-pxcservice MySQL bootstrap----wsrep-cluster-address=" gcomm://"# Start a PXC node with the

First, the MySQL database I used was version 5.7.12.Problems that arise:1. Insert data display error, insert unsuccessful, appears: incorrect string value: ' \XCD\XF5\XD5\XBC\XBE\XA9 ' for column ' Sname ' at row 12. Insert Chinese, although