Database Administrator

I. unreasonable index design---- For example, a table with 620000 rows of record and rows with different indexes has the following SQL statements:---- 1. A non-cluster index is created on date.Select count (*) from record where date>'20140901' and

Many Access and SQL Server developers often face the problem of upgrading an Access database to the SQL Server database. Because of the existing Access Upgrade Wizard, this transformation process becomes quite simple, especially when you create an

Create a table as defined in the target table;Add a constraint to the table to ensure that the table data is in the target partition;Alter table source table switch to target table partition NumberThe partition number can be obtained through $

OSwatcher is a script tool recommended by Oracle for OS-level running status detection. Exadata is installed by default. But how does Exadata automatically start OSwatcher after the system starts? How can we modify OSwatcher parameters to adjust

Both PostgreSQL and Oracle provide statements such as row_number () over () to rank corresponding fields, which is very convenient. MySQL does not provide such a syntax. Recently, due to the increasing demand for migrating data from Oracle to MySQL,

I. Introduction to Aix Aix is one of the versions of Unix operating systems. It is mainly used on the IBM Xeon 6000 series computers. Other Unix systems, such as SUN's Solaris, HP Unix, and Linux. Currently, the Aix system versions include Aix 4.x

Yesterday, a friend encountered a problem when developing SSIS in a 64-bit environment: The Excel Connection Manager is not supported in the 64-bit version of SSIS, as no ole db provider is available.   Because there is no 64-bit Microsoft ole db

Openness SQL ServerIt can only run on Windows without any openness. The stability of the operating system is very important to the database. The Windows9X series products focus on desktop applications, and the NT server is only suitable for small

BKJIA database channel also recommends the database index and query topic. I believe this topic will help you better understand this article. In order to get information from a book, how can we make it more effective? Should I carefully read the

Data import and export will be used when SQL Server programming or management is involved. There are many ways to import and export data, which can be summarized based on my experiences in Project Creation: 1. SQL Server Import and Export wizard.

Monitoring over 250 configuration parameters and thousands of measurements is not an easy task for Oracle administrators to monitor the overall health of their Oracle databases. Oracle provides a variety of tools to monitor performance, but this is

This article describes how to perform physical backup by taking the implementation of automatic physical backup for Oracle databases in Linux as an example. We hope to help more Oracle Database Administrators understand this physical backup process,

INFORMIX uses the lock technology to solve the concurrency control problem of accessing the same object when multiple users access the database. INFORMIX supports complex and scalable locking technologies. Lock type INFORMIX has three different

Oracle Enterprise Manager is a management framework that enables you to manage a Complete Oracle environment, including databases, iAS servers, applications, and services. Diagnose, modify, and optimize multiple databases. Tasks are scheduled at

[Q] How to restrict specific IP addresses to access the database [A] You can use the logon trigger, cmgw, or add A protocol under $ OREACLE_HOME/network/admin. ora file (Some OS may be. protocol. ora), 9i can directly modify sqlnet. ora: Add the

1. What is bad database blocks? First, let's take a rough look at the format and structure of the database block-The database data block has a fixed format and structure, divided into three layers of cache layer, transaction layer, data layer. When

This article attempts to provide a common diagnosis method for CPU consumption problems through a case adjusted in the actual business system. In most cases, system performance problems are caused by poor SQL code. As a DBA, how to discover and

For a long time, multimedia information has been stored in the computer as files and managed by the operating system. However, with the development of computer networks and distributed computing, multimedia information has been efficiently managed

Enterprises with geographically dispersed subsidiaries are geographically dispersed, resulting in scattered business data. The company and its subsidiaries are located in different cities or regions in different cities, in terms of business, apart

So far, the export/import toolset is still the preferred utility for transferring data across multiple platforms with the minimum labor intensity, although it is often complained that it is too slow. Import only reads each record from the export