MySQL

In write SQL, there are often such things as updating a row of records, and then getting the updated line. itself from the program, no difficulty, the big deal to cache this line, finished direct access. But from the database point of view, how can

1. FreeBSD this system to tell the truth really does not have Ubuntu convenience, to install a software, Apt-get install under can be, and in FreeBSD under the ports down only in the installation, but usually there is no resources, pit AHSo I can

Because the project co-development, colleagues sent a project SQL file, open a look is a directory, there are hundreds of databases. Each database acts as a separate file.Every SQL file hasCREATE DATABASE IF not EXISTS ' XXXX 'Use ' XXXX ';He can

for the software connection database, from a very early interest to understand, previously because of limited strength, think access is quite convenient, there is no other high-level database to toss. Recently, because the company to build a

Recommended this SQL optimization book, "Effective MySQL SQL statement optimization."The main explanation: How to analyze the performance of SQL, index principle, how to create appropriate index, how to analyze the performance bottleneck of the line

Mysql> show Processlist;ID Identification numberUser Current usersWhich port from which IP the Host command is issuedDB Current Process-connected databasecommand commands for the current connection executionTime when this state was executedSQL

1. Assume that there are already mysql-5.6.21.tar.gz and cmake-2.8.4.tar.gz two source files(1) Install CMake First (mysql5.5 is compiled by CMake later)[[email protected] rhel5 Local] #tar-zxv-f cmake-2.8.4.tar.gz[Email protected] rhel5 Local] #cd

Li Gang lightweight Java EE Sixth chapter of the pit. 艹 Li gang himself have not tried this code, ah, 6.4 This is a hqlquery.java in need of the table, and he provided the SQL script is not up to AH. There's a problem with the character encoding set,

MySQL master-slave monitoring under Window Platform (Window execution plan with VB script)(1) Install ODBC (VB link MySQL driver) on windowis: http://dev.mysql.com/downloads/connector/odbc/Select the appropriate version according to the window

Another powerful feature provided by mysql++ is the template query, which provides a similar mechanism to printf in C: You provide mysql++ with a query string that contains fixed strings and variable placeholders, which you can then replace with

1. Installing CMakeMySQL has been removed from version 5.5, and is replaced by the CMake tool./configure.Therefore, we first need to compile and install the CMake tool in the system source code.# wget

Explain shows how MySQL uses indexes to process SELECT statements and join tables. Can help select better indexes and write more optimized query statements.Using the method, add explain to the SELECT statement, such as:Select * from where

Range of values for each data type in MySQLTurn around here and write it down slowly.TINYINT-128-127TINYINT UNSIGNED0-255SMALLINT-32768-32767SMALLINT UNSIGNED0-65535Mediumint-8388608-8388607Mediumint UNSIGNED0-16777215INT or INTEGER-2147483648-214748

All database structures are as follows, some IDs are int, see comments100W Data:ID is an indexed field, 4 bytes of int, and the database engine is MyISAMEcho"". Xdebug_time_index (). " "; 0.011001110076904 for($i= 0;$i$i++) { $random=Mt_rand(1,9

The MySQL PID file records the PID of the current mysqld process.When you start MySQL through Mysqld_safe, Mysqld_safe checks the PID file, and the PID file defaults to $datadir/' hostname ' When the PID file is not specified. pid1) PID file does

Current network, using MySQL database, access to a single machine can reach 1w/s, used for a long time, intends to summarize some of the knowledge of MySQL. Start with the most basic storage engine.We currently use the storage engine is: InnoDB.I.

The high_priority of select is still more useful, and in practice, the average 5-6 seconds is increased to 3 seconds=========================================================================The previous section focused primarily on how to make

Solve a deadlock problem in mysql Here we are talking about innodb deadlocks! I have found a lot of other commands on the Internet to view the deadlock information. This can be used later: Show engine innodb status; (varies with the mysql

CAPI-read database content in C language on linux (mysql) If you want to know how to operate databases in C language, you must understand the meanings of these structures. Here is a brief introduction. If you want to learn more deeply, you can

Enable mysql remote connection in Linux Procedure for enabling mysql remote connection in Linux.Mysql remote connection linuxserviceserveruserMysql by default, the root user can only access the local database, but cannot remotely connect to and