Database Administrator

This article allows you to use eight simple sentences to teach you how to deal with the MySQL database.1. Connect to MYSQLFormat:Mysql-h host address-U User Name-P User Password1. Example 1: connect to MySQL on the local machine:First, open the DOS

As the company's website traffic grows, MySQL naturally becomes a bottleneck. Therefore, I have been studying MySQL optimization recently. The first step is to naturally think of MySQL system parameter optimization, as a database system for a

This article uses instances to analyze the solutions for Website access failures caused by database deadlocks. Problem: the website cannot be accessed. After the host is restarted, the website runs normally. Solution: Database deadlock. Cause of

Because of its competitive prices and ease of use, MySQL has gradually increased its market share. The open source code community has developed a database connector that can be used in. Net Framework (. NET Framework) to extend the scope of use of

I now have a table with the same data. Now I want to modify one of the data in this field (the letters and so on after the data ),The table is as follows:Mysql> desc test;+ ------- + ---------- + ------ + ----- + --------- + ------- +| Field | Type |

No one would deny that Oracle is one of the most influential database products in the world; but good things do not seem to be so useful (it seems at first ), even a bit heartless-it always gives layman a heartless error number. My personal summary

In viewing Mysql file operations, it operates on files on different operating systems, in addition to using standard C Runtime library functions, including open, close, seek, etc, the file and directory operation functions under Win32 use CreatFile,

The error message is as follows:.....070813 13:10:17 [ERROR]/usr/local/mysql/bin/mysqld: Can't open file: './yejr/access. frm' (errno: 24)070813 13:10:17 [ERROR]/usr/local/mysql/bin/mysqld: Can't open file: './yejr/accesslog. frm' (errno: 24)......07

I am the administrator of a small and medium-sized Linux website. The system architecture is RHEL 4.0 + PHP 4.3 + Mysql 4.03 + Apache 1.23. The average daily IP Access volume is 200, a typical small Linux website. Because it is a small website,

Structured Query Language (SQL) --- Structured Query LanguageVPD (virtual private database) --- virtual private databaseOAS (Oracle Application Server) --- Oracle Application ServerSynonym --- synonymInstance --- instanceSGA (System Global Area) ---

Mysql5.x: http://dev.mysql.com/downloads/mysql/5.0.htmlThe above is the official address of mysql. There are too many mysql versions above, and the speed is very slow. We recommend that you renew them from the Chinese website Mysql tool download:

It was installed five times in debian4.0 to securely install Oracle. I have found a lot of information and installation methods on the Internet, and none of them can completely solve the problem. Finally, we can only get the power of the family.1.

I. background The query optimizer is very important to the performance of SQL statements, because the SQL statements we write are finally executed by the database and are implemented through the query optimizer to generate an execution plan. If the

Create index idx_p_merchant_detail_id on D_ORDER_DETAIL (merchant_detail_id) Online; After the index is created for a long time, it is not reflected. Then, when the index is deleted, the following error is returned: Error: ORA-08104: this index

Initialize Oracle Data to mysql. Use the oracle to mysl tool to map oracle data types to mysql Data Types and modify them accordingly so that mysql can accommodate the length of oracle fields, this document executes the initial data and does not

Oracle ORA-01000: maximum open cursors exceeded Chinese error "exceeds the maximum number of opened cursors ".This error is usually caused by statement or preparestatement placed in the loop body of the program code, and the statement or

Main functions in DBMS_ SQL Encapsulation1. OPEN_CURSOR: returns the ID of the new game subject.2. PARSE: PARSE the statement to be executed3. BIND_VARIABLE: connect the specified quantity to a specific variable.4. DEFINE_COLOUMN: defines a field

Related links: Brief Introduction to MongoDB (installation) I. Start the service 1. Bind the virtual IP address of LVS on each RS (Real Server) and suppress ERP [Root @ LVS_RS_104 ~] #/Etc/rc. d/init. d/lvs_dr.sh startRealServer Start OK[Root @

-- Create a partition tableCreate table test (x int, y int)Partition by range (X)(PARTITION PART0 values less than (100 ),PARTITION PART1 values less than (MAXVALUE));-- Create an indexCreate index IDX_TEST_X on test (X) LOCAL;Create index

The Database Installation Guide on different Oracle platforms provides some recommended system parameter settings for Oracle deployment. However, the recommended value is a general conclusion, it does not completely meet different needs. Using