Database Administrator

The architecture of Oracle Data Warehouse can be divided into three layers: Data Acquisition layer:Oracle Database Enterprise ETL Option + Oracle Database Data Quality Option implements Data model design, Data Quality management, and, all functions

1. Physical Structure The physical structure of Oracle consists of control files, data files, redo log files, parameter files, archive files, and password files. The data in a database is stored in physical files on the disk. When used, the data is

The following is a brief summary: 1. service name the service name is actually a database name). A name must be specified when installing ORACLE. 2. tablespace table space: disk storage location of database objects 3. schema scheme, logical

If the SQL Server database engine is not started, a troubleshooting step is executed to start the database engine from the command prompt. This topic describes how to start a database engine instance. Note: For troubleshooting, SQL Server should

For SQL Server, the most important resources are memory, Disk, and CPU. The memory is the most important, because SQL Server only needs enough memory to access all the data to meet performance requirements) put it in the cache. This article

Now we are working on an interface to operate different databases through different connection strings. Mysql databases are used. This database has never been used before. There are many access and SQL server databases. Through some information on

Let me start with the following two examples. Case1:     HELLODBA.COM>set time on     10:22:09 HELLODBA.COM>update t_test1 set SECONDARY='A' where object_id = -1;     1 row updated.     10:22:22 HELLODBA.COM>commit;    

What is parameterized query? I. Definition Parameterized Query (Parameterized Query or Parameterized Statement) refers to a Parameter (Parameter) that is used to give a value where a value or data needs to be filled in when connecting to the

The first thing to note is that the number of connections is limited: The Code is as follows: For (int I = 0; I { SqlConnection conn = new SqlConnection (@ "Data Source =. \ SQLEXPRESS; AttachDbFilename = "" E: \ DB \ NORTHWND. mdf "";

There are many reasons for slow query speed. The following are common causes: 1. No index or no index is used (this is the most common problem of slow query and is a defect in programming) 2. Low I/O throughput, resulting in a bottleneck effect. 3.

With the popularization of networks, more and more network-based applications are available. Network databases are one of them. One or several servers can provide services to many customers. This method brings a lot of convenience to people, but it

In a complete Hospital Information MIS, image data access is essential, such as the preservation of X-ray images and CT images. On the one hand, these image data provides an important basis for accurate diagnosis of illness in remote diagnosis and

In today's highly competitive market environment, cost control is undoubtedly a very important part for enterprises to improve their competitiveness. As many competitors will provide homogeneous products and services, enterprises must start from

Blog from zsf8510: 1. -- secure The IP number returned by the gethostbyname () system call is checked to ensure that they are resolved back to the original host name. This makes it harder for some outsiders to obtain access permissions by imitating

Software Configuration Management, also called SCM, is the first bottleneck encountered in quality improvement of software organizations, because the core of SCM is progress control and risk management, these two items are the biggest weakness of

Isolated user problems For example, many tables in the previous database were created by user test. However, after we restored the database, the user test became an isolated user and did not have the corresponding login username, even if you have

The key reason for upgrading the storage capacity of Large objects (LOB) is that the data security requirements are getting higher and higher in Oracle 11g, this article mainly studies how to extend the Transparent Data Encryption (TDE) feature of

In my opinion, the key to solving the problem lies in identifying the types of the problem and clarifying the solutions to each problem. In addition, many database problems are caused by incorrect operations and incorrect configuration. Therefore,

1. MySQL Replication process MySQL replication) is an asynchronous replication, from one MySQL instace called Master) to another MySQL instance called Slave ). The entire replication operation is completed by three processes, two of which are in the

Many people think it is not very difficult to allocate permissions for Oracle users. However, you need to be careful and patient in assigning permissions for Oracle users. This article will talk about how to assign to mid users. Authorize all the