MySQL

introduced 5.6.2 command-line Format --innodb-print-all-deadlocks=# system Variable name innodb_print_all_deadlocks scope global dynamic

Web project using root account root password to deploy, through eclipse loading to the Tomcat server can be published successfully, into the war package into the Tomcat WebApps directory cannot be published successfully, error:Jdbc.properties

MySQL migration huge amount of data fast migration solution-incremental backup and recovery--chenjianwenFirst, preface:When MySQL library size reaches dozens of g or hundreds of G, migrating up is a very troublesome thing, business interruption,

This article illustrates four concepts related to databases: transactions, database reads, isolation levels, lock mechanismsFirst, the businessFirst look at the Baidu Encyclopedia of the definition of database transactions:Perform a series of

In the company's production environment, due to the server's root password is always developed to master, has been in the final change to a library must use the root authority, helpless development finally told me a sentence, the password is too

Mysql-prepare statementsFeature Description:MySQL Prepare statement usageIn order to prepare the statement using MySQL, you need to use the other three MySQL statements as follows:PREPARE -The statement that is ready to be executed.Execute -executes

There may be some small details in the daily write SQL that cause the overall SQL performance to degrade several times or even dozens of times times, hundreds of times times. The following example is the performance loss caused by a single quotation

WORKAROUND: A system parameter for MySQL: Max_allowed_packet, which defaults to 1048576 (1M),Enquiry: Showvariables like '%max_allowed_packet% ';Modify the value of this variable:The MySQL installation directory"Max_allowed_packet = 1M" In the

IntroducedPercona is the only one by one open source, free MySQL hot backup tool that enables non-blocking backup of the InnoDB database. Has the following advantages:1. Complete, fast and reliable backup2. Transaction execution is not interrupted

Download the. msi installation package from the Start website, unable to start when installing to configuration server, long time card is here, cannot continue. On the internet to look at the solution, found that the. zip installation package for

1. Download:Website: https://nchc.dl.sourceforge.net/project/boost/boost/1.59.0/boost_1_59_0.tar.gz2. Compiling:2.1 Quick Install boost:It is easy to install boost 1.59.0 under the operating system of the Linux kernel, and the simplest way is to

Case: The PHP backend code allows the employee's information to be deleted, the deleted employee information will be restored (similar to recovering employee information from the Recycle Bin), and the deleted employee can also be emptied (similar to

The configuration file is as followsLicensed to the Apache software Foundation (ASF) under one or moreContributor license agreements. See the NOTICE file distributed withThis is for additional information regarding copyright ownership.The ASF

Turn from the Internet.When a large system is established, it is found that a lot of SQL operations are overlapping, the individual calculations are the same, for example: In the business system, the calculation of a work order. When this happens,

Transferred from: http://www.cnblogs.com/mark-chan/p/5384139.htmlIntroduction to Stored ProceduresSQL statements need to be compiled and executed, and stored procedures (Stored Procedure) are a set of SQL statements that are compiled in order to

1. Zip:Https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.20-winx64.zip2. Official Document Location:Http://dev.mysql.com/doc/refman/5.7/en/installing.html3. Extract the files to your favorite location, I extracted to the C: Packing directory4.

TodaySELECT * FROM table name where To_days (Time field name) =to_days (now ());YesterdaySELECT * FROM table name WHERE to_days (now ())-To_days (Time field name) 7 daysSELECT * FROM table name where Date_sub (Curdate (), INTERVAL 7 day) Nearly 30

The whole story:Today, there is a problem: a data table case_folder_info want to implement a custom sorting function, in the Table a new field sort_number, because there is existing data in the table, so this sort_number field is empty, but to

MySQL FAQ and application skills summary, mysql application skills Preface In the daily development or maintenance of MySQL, it is often difficult to avoid some problems or faults, such as lost passwords and table damage. Summarize the common

Install mysql5.7.. on Windows 10 and forget to modify the root password, windows10mysql5.7.Example: MySQL5.7.19Download Of course, the first is to download the https://dev.mysql.com/downloads/mysql/ official website. Select a version suitable for