engine innodb

In Oracle, there is the merge into syntax, which allows you to modify a statement at the same time and add data. MySQL does not have the merge into syntax, but replace.REPLACE runs like INSERT. There is only one exception. Assume that an old record

How to modify the default storage engine for MySQL, and modify the storage engine for mysql Mysql storage engine: The MySQL server adopts a modular style, and each part remains relatively independent, especially in the storage architecture. The

1.2.3.1# Mysql-front 5.0 (Build 1.0)2 3 /*!40101 SET @[email protected] @SQL_MODE*/;4 /*!40101 SET sql_mode= ' strict_trans_tables,no_auto_create_user,no_engine_substitution '*/;5 /*!40111 SET @[email protected] @SQL_NOTES*/;6 /*!40103 SET sql_notes=

SQL interview test (Part 1), sqlpart This article is inOn the basis of the original Cat Qi post, the notes implemented by myself in the MySql database by question are continuously updated... Refer to the original post:Http://www.cnblogs.com/qixuejia/

Later in doing WordPress, the original did not know that WordPress used the InnoDB data engine, so in the original database built a database, the beginning did not find the problem, installation, import SQL, no problem, then did not think much.

MySQL as the most commonly used database, often encountered a variety of problems. What we're going to say today is the changes to the table storage engine. There are three ways, the list is as follows. 1. True connection modification. It is slower

Originally used in order to install, so in the setting of database usage (Figure 1 below) in accordance with the official recommendations of Discuz, selected are non-transactional database only (supporting the MyISAM data engine of the

It takes two weeks to implement a small payment system because of its own project needs. Though small spite, all kinds of necessary modules such as account lock, transactional assurance, running water reconciliation are fully realized, the whole

The night of the master from copying, conveniently adjusted down from the library of the MY.CNF. The morning remembered from the library forgot to restart, after the command then opened slave, incredibly error

EnvironmentMySQL version 5.6.28Problem:Execution mysqldump The following error occurred, small white when performing mysqldump backup, is to perform a single error1, Mysqldump:got error:1146:table ' MySQL. innodb_index_stats' doesn ' t exist when

This article refers to the 5.6 version of the MySQL website reference Manual of 14.5.1, this section describes the classification of the MySQL lock, in addition to the 14.5.2 and 14.5.3 sections detailing the transaction isolation level and the

Brief introduction of MSQL data type 1, integer typetinyint, accounted for 1 bytes, signed: -128~127, unsigned bit: 0~255smallint, accounted for 2 bytes, signed: -32768~32767 unsigned bit: 0~65535Mediumint is 3 bytes, signed: -8388608~8388607,

Mysqlslap is MySQL's own benchmark tool, the advantages: query data, simple syntax, flexible and easy to use. The tool can simulate multiple clients concurrently issuing query updates to the server. The performance test data is given and the

The InnoDB row format in two formats (compact,redundant) defaults to the compact compact's storage format, and the first part is a non-null, variable-length list of field lengths, and is placed in reverse order, when the length of the column is less

Today found in bulk INSERT, the self-increment primary key is not continuous ....InnoDB auto_increment Lock ModesThis section describes AUTO_INCREMENT the behavior of lock modes used to generate auto-increment values, and how each lock mode aff ECTS

Log in to MySQL mysql-h hostname-u username-p passwordStart MySQL under MacAdded to the. bash_profile file in the terminal's own user name.Export path=/usr/local/mysql/support-files/: $PATH pathThen terminal input sudo mysql.server (start start

1. Description(1) For the MyISAM table, if you update the self-increment column with update, an error occurs if the column value repeats with the existing value, and if it is greater than the existing maximum, the auto_increment of the table is

1. AppSettings Add2. Importing SQL filesSET foreign_key_checks=0;--------------------------------Table structure for ' limitdevice '------------------------ ------DROP TABLE IF EXISTS ' Limitdevice '; CREATE TABLE ' limitdevice ' (' ID ' int (one)

from:http://blog.xupeng.me/2013/10/11/mysql-replace-into-trap/MySQL has a lot of extensions for SQL, some of which are handy, but there are performance issues with some of them being misused, and there are some unintended side effects, like REPLACE

A test Case1 Write stress tests:Use case: Automatically create table write 1 million data client concurrent 500 test InnoDB storage EngineCommand: Mysqlslap--auto-generate-sql-add-autoincrement-a--number-of-queries=1000000--number-char-cols=4--