MySQL

Mysql execution status analysis show processlist execution Status Analysis l Sleep status n usually indicates that the resource is not released. If it is through the connection pool, the sleep status should be constant within a certain number of

In Linux, mysql modifies connection timeout 1. First, enter mysql to check whether the value wait_timeout and interactive_timeout is the default 8 hours (that is, 28800) [root @ server110 ~] # Mysql-u root-p Enter password: Enter the password and

MySQL processes tens of millions of data queries and optimizes the paging MySQL database to achieve tens of millions of fast paging analysis. Let's take a look. The data table collect (id, title, info, vtype) has these four fields, where title is

The transaction isolation level of the InnoDB Storage engine in MySQL is different from that in transaction processing. 1. The set transaction command cannot be used to change the isolation level. However, you can use set {global | session}

Mysql stored PROCEDURE creation Failed 1307 error solved when I created the stored PROCEDURE "error code: 1307 Failed to CREATE PROCEDUREAn error occurred while creating the storage process for mysql. After checking the information and practices,

The use of mysql distinct By The Way, mysql's DISTINCT keyword has a lot you can't think of. 1. when count does not repeat, it can be used, for example, select count (DISTINCT id) FROM tablename; it is used to calculate the number of records with

When the character utf8 encoding exceeds 3 bits, the error message is inserted into the Mysql database, and the Incorrect string value is resolved: '\ xF0 \ xA1 \ xBF \ xA8 \ xE9 \ x82... for column 'last _ name' this problem occurs in mysql. If

Slow query caused by MySQL prefix indexes the front-end time is a DB-related project. alanc reports that using indexes is much slower than using indexes, which is a little ruined. So I followed up and used explain to look at two different query

Mysql 5.6 online ddl testing in the production environment, because of business needs, changes the mysql table structure, especially when the data volume is particularly large, millions or even tens of millions of data, mysql online ddl operations

Mysql user permission management many people have problems with authorization on the Internet, especially because there are no quotation marks for the IP address ..... most people COPY it .. log on to mysql with the root local account and add the

Mysql and Oracle Database paging Query Method 1: mysql database paging totalPage) {pageNo = totalPage;} // calculate the start position of each page, note that the start position starts from 0; int startPos = (pageNo-1) * pageSize; Statement st =

Mysql is confused about the set global SQL _slave_skip_counter = N command. In the maintenance of the slave database, set global SQL _slave_skip_counter = N is a common command. This article describes this point in detail, this helps us to

A long time ago, innodb_flush_log_at_trx_commit and innodb_flush_log_at_trx_commit had some misunderstandings about innodb_support_xa. They thought that innodb_support_xa only controls external xa transactions, and internal xa transactions are

Description of the mysqlhotcopy command preface mysqldump adopts an SQL-level backup mechanism, which imports data tables into SQL script files. When a database is large, it occupies a large amount of system resources and supports commonly used

Mysql Master/slave synchronization cannot be synchronized due to power failure. Occasionally, mysql slave may have a replication error "cocould not parse relay log event entry" cocould not parse relay log event entry. the possible reasons are: the

Solve the Linux Mysql 1130 error. When I remotely log on to Mysql through navicat in win32 today, the following error occurs: I don't need to think about it. It must be a Mysql access permission problem. First, log on to the Linux server remotely

Mysql password change error: Can't Create Thread: Errno 11 solve today after installing mysql, want to change the password, run Myqladmin-u root password 'Password'The error message is as follows: Can't create a new thread (errno 11); if you are

Data Sorting and grouping statements when SQL statements are used to perform query operations, we may find that the sorting of the queried data results is unordered. To better observe the query results in a data table, developers or users often need

Mysql xtrabackup installation and simple use of Xtrabackup is an open-source project of percona. It is used to implement the innodb Hot Backup function similar to the InnoDB official Hot Backup Tool and can quickly back up and restore mysql

Mysql basics: database creation, add, delete, modify, and query ============== view the database ============================ ==== use the SHOW statement to find out the current database on the server: [SQL] mysql> SHOW DATABASES; + ---------- + |