MySQL

Prepare source code compilation on the server where is the official website of Mysqlmysql Download the source package?OpenWww.mysql.comdot the top of the downloadthen point to the bottom of theMySQL Community Edition (GPL)Download from MySQL

Li Wu:Learn to think more, honouring teachers save Thanksgiving. Leaf See Root 321, rivers with one.Meekness Conscience Lord, willing to do without regrets to the most bitter. Reading exercise strong body and mind, Prudential advised and the line

Why do I need a MySQL cluster?In the performance bottleneck of a large distributed system, the most vulnerable is the connection. There are two connections, one is the client connection to the backend, and the other is the back-end connection to the

MySQL time to get a timely conversion between1.1 Get the current date + time (date + times) function: Now ()In addition to the now () function to get the current datetime, MySQL has the following function:Current_timestamp ()

1. CodeSELECT a.id, A.activity_name, ( case when A.activity_end_time>Now () Then' Participation 'ELSE (A.activity_doubt<> ' * 'and A.activity_doubtc.doubt) OR (a.activity_praise<> ' * 'and a.activity_praise> c.praise * 100) Then' Not compliant 'ELSE'

First-level caching:Also known as local cache, sqlsession level cache. The first-level cache is always on, and the data queried during the same session with the database is placed in the local cache.If you need to get the same data, take it directly

The likelihood of problems occurring1, may be/opt/mysql/data/data directory MySQL user does not have permissions (modify the data directory permissions)Workaround: Give permission, execute "chown-r mysql.mysql/opt/mysql/data" and restart Mysqld2.

[MySQL] ERROR 1364 (HY000): Field ' ssl_cipher ' doesn ' t has a default valueMy MySQL version is 5.6.14 version, is the binary package installed (although the binary package installed, but the following issues also apply to the source installation

PHP and MySQL transaction processingIn general, transactions should have acid characteristics. The so-called acid is Atomic (atomicity), consistent (consistency), Isolated (isolation), durable (persistent) four words written in the first letter, the

MySQL master-slave replication:Lab Environment:Linux CentOS7 two: 192.168.230.10 (master)----192.168.230.11 (from) (System installed, switch off the firewall or configure the firewall).MySQL 5.7 (Download the official Yum source, yum install-y MySQL

Execute SQL as follows:CREATE TABLE `qcloud_sms_template` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `ctime` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY(`id`),) ENGINE=InnoDB DEFAULT CHARSET=utf8;Execution Result:ERROR 106

1.mysql-server only allow native (localhost, 127.0.0.1) to connect access for security reasons. This is not a problem for the site architecture of Web-server and Mysql-server on the same server. However, as the site traffic increases, the late

Importing CSV data with Workbench can only import the first row of data, that is, the row that labels the column names for each column.However, the problem is that each time the import is complete, the system prompts that 500 records have been

In web development, we often need to insert data from one table into another, and sometimes we need to specify an import field, which only needs to import records that do not exist in the target table, although these can be broken down into simple

Use MySQL to insert data containing Chinese in usercase table, error [ERR] 1366-incorrect String value: ' \xe5\xb0\x8f\xe5\xb0\x8f ' for column ' name ' at row 1The table statement and the inserted data statement are as followsCREATE TABLE usercase (

1) First, why should I turn on Binlog log and slow query log?Binlog log will be recorded in the database, so adding and deleting the operation, when accidentally delete, empty data, or database system error, this time you can use the Binlog log to

1. Delete:delete from table_name; or delete from table_name where column =?;Delete the data in the table, but do not delete the table structure , delete the time is a row of deleted, less efficient, can be used to delete a single data.2.

Database Connection Pool Druid usage instructions, database connection druid Replace it with the optimal database connection pool based on factors such as comprehensive performance, reliability, stability, scalability, and ease of use. Druid: druid-1

Mysql Data Storage process parameter instance details, mysql Data Storage There are three types of MySQL stored procedure parameters: in, out, And inout. What are their respective functions and features? I. MySQL stored procedure parameters

Mysql transaction processing details, mysql Transaction Processing I. Mysql transaction concepts MySQL transactions are mainly used to process data with large operations and high complexity. A logical execution unit consists of database operation