Database Administrator

Database replay is a great tool that can capture the actual load in the database and replay it at will. It is part of the real Oracle Application Test option. It focuses on the word "actual", that is, the replay load is the actual load in the

There is a long debate about where to store the application's business logic: whether it is in the application's business logic layer or in the database layer. The absolute supporter of the application logic layer proposed that the only purpose of

The following articles mainly describe the basic function type of the MySQL database stored procedure, that is, the string, which is often used in actual operations, the following articles mainly describe the timing application and related functions

BKJIA exclusive Article] low carbon index: here we use Intel Xeon X7500 processor TDP as the standard for computing power consumption TDP = 130 W/h = 2.167 W/m = 0.036 W/s) to facilitate computing and visualization ). In addition, according to data

The editor will introduce how to connect Java to Oracle, DB2, SQL Server, Sybase, MySQL, PostgreSQL, and other databases. 1. Oracle Database Class. forName ("oracle. jdbc. driver. OracleDriver"). newInstance ();   String url = "jdbc:

"Memory is a new hard disk, and hard disk is a new tape" is from the Turing prize winner Jim Gray. I. Preface I understand that random I/O should be put into the memory, and the sequential I/O like the tape should be left to the hard disk, excluding

How can I use SQL to query records of yesterday, today, tomorrow, and this week? How can I use SQL to query records of one day, three days, one week, one month, and longer-a quarter? This article provides some methods. SQL queries today's records:

Some specialized vocabulary of the database system: 1. Data ): Symbols that reflect the facts of the objective world and distinguish their characteristics: characters, numbers, texts, sounds, figures, images, charts, pictures, etc., which exist

Guidance:Unable to open userDefault Database, Login Failed, which is one of the issues that SQL Server users are familiar. When using Enterprise Manager, query analyzer, various tools and application software, you may encounter this problem as long

1.6 annotation SpecificationAnnotation SpecificationIt is an important indicator for determining the advantages and disadvantages and maturity of a developer. A good R & D engineer must be well-thought-out and then be able to write comments. The

Previously, I shared with you "using with statements to write a slightly complex SQL statement". This time I made a Performance Comparison Between with statements and subqueries. As instructed by Boyou SingleCat, perform some performance tests on

In the previous article, how to build our own data access layer 2, we have implemented the corresponding features of the data access layer. Now we have finished the work. Let's take a look at the code section and try the features of the previous

MySQL optimization mainly includes schema optimization and Query optimization ). The high-performance index Policy discussed in this chapter mainly belongs to the scope of structure optimization. The content of this chapter is based entirely on the

When XML, InfoBase, Webserver, and other concepts are booming, we still see that the current database technology actually only solves 15% of structured data management problems for enterprises, how can we manage the remaining 85% of unstructured

INSERT new data using the INSERT statement Syntax: INSERT [INTO] tbl_name [(col_name,...)] VALUES (pression ,...),...INSERT [INTO] tbl_name SET col_name = expression ,... Let's start to use the INSERT statement to add records. This is an SQL

Any database programmer has the following experience: a bad SQL query statement in a high-traffic database driver can seriously affect the running of the entire application, it not only consumes more database time, but also affects other application

Oracle provides a number of methods for the use, monitoring, and maintenance of data spaces. At the same time, features in various versions are gradually enhanced to simplify the complexity of this aspect, improve application running efficiency. 1.

I think the function of database indexing should be divided into two aspects. In addition to affirming its positive impact on database performance, we also need to recognize its potential negative impact. Only in this way can the Database

Database administrators must always pay close attention to potential database problems that may negatively affect the availability or performance of each system they manage. Generally, the database administrator can monitor and maintain the system

1. Install the latest service package To improve SQL Server security, the most effective method is to upgrade to SQL Server 2000 Service Pack 3a (SP3a ). To download SP3a, visit the SQL Server 2000 SP3a page. In addition, you should install all