Database Administrator

Date_default_timezone_set ('prc'); // set the time$ DB_Server = "localhost ";$ DB_Username = "root ";$ DB_Password = "123 ";$ DB_DBName = "user ";$ DB_TBLName = $ _ REQUEST ['tbname'];$ Savename = date ("YmjHis ");$ Connect = @ mysql_connect ($

Logical backup refers to the process of using the export tool to export the structure and data of the data object to a file, logical recovery refers to the process of using the import tool to import data objects to the database when database objects

Tool usage: Transfers Oracle data to the Mysql database (Oracle database), and in turn transfers Mysql Data to the Oracle database (Mysql database ). Attachment: http://download.csdn.net/detail/zou_hailin226/6320051 Tutorial (here is an example

MYSQL Basics1. Join multiple tables1. Inner join-the primary key of the table is connected to the foreign key, and only data with the same key value is retrieved.Select user. name, order_basic.oid from order_basic inner join user on order_basic.uid =

  Transactions are one of the important features of a database that distinguishes a file system. In a file system, if you are writing a file but the operating system suddenly crashes, the file may be damaged, of course, there will also be some

In the previous article, the memory management of SQL Server resources), I introduced some theoretical knowledge about memory management of SQL Server. This article uses this knowledge to solve some common problems in reality. I. Optimization of

Editor's note: in the previous article "the function of the SQL bit by bit SET QUOTED_IDENTIFIER OFF statement", the author summarizes the usage of SET QUOTED_IDENTIFIER. This article introduces a simple string segmentation function. The previously

Test Case Description The test case is in the B2C field. A product order information table is used to store the purchased items. However, some other fields are removed for testing and the data items in the table are not described in detail, field

Introduction to hard disk principles A typical Hard Disk 1 is shown. Figure 1. A typical Hard Disk As shown in figure 1, the disk on the hard disk is rotated at a high speed, and the head arm moves back and forth on the disk to read and write data.

Recently, when the company wants to develop a new system, it basically decides to use the ORM high-level level and is still hesitating to worry about efficiency ). Since ORM is used, it is natural to think of designing a database with the idea of

It is said that MongoDB is slow. Objection: If no unique index is set, tens of thousands are inserted per second on a common office computer with only _ id, and tens of thousands are inserted per second on a common x86 server, what do you mean is

Although some differences between Sybase and SQL Server are quite large, for example, stored procedures in the Sybase database management system cannot be compiled on SQL Server, but other differences are not very large. Before this conversion, it

In Oracle databases, segments are often used to store all data of specific logical objects. For example, when a database table or index is created, Oracle will allocate storage space for these objects to store the information they need. Segments are

1. The most basic DBMS_OUTPUT.PUT_LINE () method. DBMS_OUTPUT.PUT_LINE (output) can be used anywhere between BEGIN and END. However, this is a problem where the function can display up to 255 characters at a time, otherwise, the buffer overflows. In

I. SGA 1. Shared pool tunning The Optimization of the Shared pool should be given priority, because a cache miss occurs in the shared pool, which is more costly than the data buffer, because the dictionary data is generally longer than the data

Several friends have such questions: select * from tab1, tab2 where tab1.id = tab2.id and tab1.col1 = 123 and tab2.col1 = 'abc' According to the execution order you described, tab1 and tab2 are first given the Cartesian product,

I was asked today, if we need to execute SQL Server proxy tasks in code, what is the idea? I think there are usually two ways of thinking. 1. Manage Object Model through SMOSQL Server) 2. Stored Procedures The following describes how to use SMO. 1.

For example, there is a table (USER_INFO) for employee information. This table contains three fields: employee ID, employee name, and employee ID card copy. Because the size of the employee ID card copy is relatively large, the LOB data type is used

After installing Oracle 10 Gb, I want to enable SQL * plus for learning, and then follow the steps in the book to connect to the database with scott user. After the installation, an error is prompted several times. Error: the account is locked Then

BKJIA comprehensive report: bib and bib-what is this? When winter is approaching, will the weave and neck be warm? This is a popular Internet term. This is the way of life and attitude of everyone. "Look for me? Come to my Weibo !" Recently, friends