MySQL

Status = Show status like '% percent ' [example: Show status like ' Com_select ']variables = Show variables like '% percent ' [Example: show variables like ' query_cache_size '] 1, MySQL query times (status)Com_select; Com_update; Com_insert;

The structure of the table is as follows: Copy Code code as follows: Mysql> Show create table person; | person | CREATE TABLE ' person ' ( ' Number ' int (one) DEFAULT NULL, ' Name ' varchar (255) DEFAULT NULL, ' Birthday '

Objective In MySQL, the thread exclusive memory is mainly used for each client connection thread to store the exclusive data of various operations, such as thread stack information, packet sorting operation, data read and write buffering, result

First of all, the MySQL service to stop first. Two. Change the database store master path in the MySQL profile My.ini Open the MySQL default installation folder C:\Program files\mysql\mysql Server 5.1 my.ini file, click "Edit" at the top of

Copy Code code as follows: --Query SELECT tp.tp_id, TP.TPMC, Tp.leveid, Tp.tpdz, TP.JGM, TP.SCSJ, Tp.pbzyid, TP.KSBFSJ, TP.JSBFSJ, Tp.status, TP.TPBZ from QD Gl_tupian TP INNER JOIN QDGL_PQB PQ On Tp.tp_id=pq.tpid WHERE pq.bfjgm= ' 27010825 '

(Reference self >)Suppose there is such a requirement: Write a union query whose first subquery executes as a branch, and if a matching row is found, the second branch of the query is no longer executed. In general, we can write a union query like

Using rsync to configure a large number of MySQL, save a lot of compilation and configuration time, with the master and slave server to modify the MY.CNF, after the discovery of data can not be synchronized,On slave server Show slave Status: Fatal

Indexes can improve the retrieval efficiency of the data, reduce the IO cost of the database, and the index can reduce the sorting cost of the database. Sorting grouping operations mainly consumes CPU resources and memory, so the ability to make

Recent server problems have caused the company's website data to be lost a lot. The wisdom of the soft also lost a lot. I've been working on this for the last few days. Repair data. It's time to restore a customer's data today. Found a consistent

I'm a novice. Learn how to manage and navigate MySQL databases and tables is one of the first tasks to master, the following content will be mainly on MySQL database and table of some common commands to summarize, some we have to grasp the commands,

Today's classmate asked me about this SQL statement, I deliberately remember, after all, this is also more common Copy Code code as follows: SELECT * FROM Member_payment ORDER BY id DESC] T GROUP by member_id limit 10 The

See Example:Data table collect (ID, title, info, VType) on these 4 fields, which title with fixed length, info with text, ID is gradual, VType is Tinyint,vtype is index. This is a simple model of the basic news system. Now fill in the data and fill

Today, when deploying an experimental system, quote the following error: Your ' max_allowed_packet ' variable is set to less than 16777216 Byte (16MB). It's also easy to understand that you need to modify MySQL's configuration file, but there's

View the MySQL statement, more commonly used is probably show processlist command, but this for the query time is relatively long statement more meaningful, for a while can execute the statement really can't spell hand speed AH. So you can only

Type=myisam after the Create statement Both Type=myisam and Engine=myisam are statements that set up the database storage engine (the old version of MySQL uses type instead of ENGINE (for example, type = MyISAM). MySQL 5.1 supports this syntax for

To import *.sql scripts directly in MySQL Qurey brower, you cannot execute multiple SQL commands at once, and execute SQL file commands in MySQL: Mysql> source C:\\test.sql; Additional MySQL common commands: (a) connection MySQL: Format: mysql-h

Normal wording: Copy Code code as follows: SELECT * FROM table_name t where T.field1 in (1,2,3,4,...); When the list in the write stored procedure is entered with an incoming parameter, the following methods are used: Mainly

Introduction about the mysql-5.5.28 source code installation process in several major error summary, I hope this article to help you students.System CentOS 6.3 Mini (without any compilation environment)The precompiled environment first installed the

1. Left function to intercept the string contents of the query field, using the Select Left (content,50) as summary from article; The meaning here is to query only the first 50 characters of the content column, where the Chinese character is used

1. New Users Copy Code code as follows: Mysql>insert into Mysql.user (Host,user,password) VALUES ("localhost", "Lionbule", Password ("hello1234")); Mysql>flush privileges; 2. Modify User Password Copy Code code as