MySQL

First, how to execute the statement in bulk1. Save the script as a script file, such as Company.sql2. Execution of commandsMysql-h host-u user name-P Enter password:******Second, pagination displayMysql-h host-u user name-P | moreThird, capture the

Why is the query slow?If you think of a query as a task, it consists of a series of subtasks, each of which consumes a certain amount of time. Optimizing a query is essentially optimizing its subtasks, either eliminating one of the subtasks, or

Today at work when found oneself update a table of a word Duan, think for a long time, the first thought is to extend the operating hours:Mysql> set innodb_lock_wait_timeout=100mysql> show variables like ' innodb_lock_wait_timeout ';However,

Linux (here is CentOS), after MySQL installation, the database data is stored by default in the/var/lib/mysql directory, if the directory is loaded with little disk space, not enough, you need to migrate to other directory locations.Method One:Refer

This morning a friend said that his MySQL forgot root password let me help to see, because no contact with MySQL so from the Internet to find informationThrough my own practice has been successful! MySQL version is 5.1Here is the information you

At first I used:Db=mysqldb.connect (db=sae.const.mysql_db,user=sae.const.mysql_user,passwd=sae.const.mysql_pass,host= Sae.const.mysql_host,port=int (Sae.const.MYSQL_PORT))Database encoding and Python code are set to UTF8, in the phpMyAdmin to add

1.explain Parsing SQL statementsFor example: EXPLAIN select * from blog_info bi inner join UAM_ View_unit_account uua on bi.account_instance_id = uua.account_instance_id where bi.is_comment = 0 or ( Bi.is_comment = 1 Span style=

If the RPM installation, you can use RPM-E mysql-serverIf Yum is installed, you can remove the MySQL installation folder with Yum Remove mysql*Then use yum to install MySQL:1. See what installation packages are available for MySQL: Yum list mysql* 2,

The database engine you can use depends on how MySQL was compiled at the time of installation. To add a new engine, you must compile MySQL. The idea of compiling an application just to add a feature might be a bit of a fuss for Windows developers,

TriggerMonitors a situation and triggers an operation when a situation occurs. Application scenarios: 1. During online shopping, when a product order is submitted, a new record is inserted into the Order table, triggering a corresponding reduction

Using Delphi 7 to connect to MySql 5.5.151.ODBCYou must first have the MySql ODBC driver. I downloaded the fully-installed version, including the MySql server, various supported connections, workbench, sample database, and documentation. If there is

This article participates in the blog contest. If you are satisfied, click here to vote for me. Click here to view the original article.I recently learned the MySQL database by myself. I had a question, but I had never been able to solve it. After

Typical MYSQL problems: (ERROR 1366 (HY000): Incorrect string value: '\ xD5 \ xD4' for column 'name' at row 1) There are a lot of posts on the Internet to solve Chinese Garbled text, basically speaking about modifying % MYSQL_DIR %/my. ini

Found_rows (): select Row_count (): update delete insert Note: It must be used together with the corresponding operation. Otherwise, the returned values are only 1 and-1 (both incorrect values) Example: Drop database if exists 'mytest '; Create

Create a data table with such a structure and insert 1.1 million random records to test the query performance. After 1.1 million random records are inserted, the data table size is 102 MB. Now we use the SQL queryer that comes with phpMyAdmin

# Count the data and index size of all tables in the specified Architecture# Tablesize. sh#! /Bin/sh# Ocpyang@126.com If ["$ #"-gt 2]; thenEcho "**********************************"Echo "too wrote input parameters"Echo "*******************************

Mysql (5.5) supports DATETIME, TIMESTAMP, DATE, TIME, and YEAR. Comparison of several types is as follows: Date and Time Type Occupied Space Date Format Minimum value Maximum Value Zero value representation DATETIME

#! /Bin/sh## Usage:#./Restore. sh/full path of your backup file# Ocpyang@126.com INNOBACKUPEX = innobackupexINNOBACKUPEX_PATH =/usr/bin/$ INNOBACKUPEXTMP_LOG = "/var/log/restore. $. log"MY_CNF =/usr/local/mysql/my. cnfBACKUP_DIR =/backup # Your

Common Character sets include ASCII, GB2312, GBK, UTF-8, Unicode First, you must know ASCII code: One byte is used to identify 0-9 numbers, uppercase and lowercase letters, and some punctuation and invisible characters. 1 byte, 8 bits, can have 256

First, we need to introduce the concept of a set: the set has no sequence and uniqueness. Sequent:Elements in a set do not have relative sequence. For two sets, the two sets are equal as long as the element values and number of elements are the same.