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Technical Articles

Database

Oracle

Is oracle a number?

Oracle is an enterprise-level relational database management system whose history can be traced back to the late 1970s. It was developed by Oracle Corporation in the United States and is currently widely used in enterprise-level applications, such as finance, manufacturing, medical care, education, telecommunications and government. So the question is, is it a number? From its definition, Oracle is a database system with far more functions than numbers. Oracle is not only a data storage and retrieval system, it also has the ability to process data. It can parse commands and execute

May 11, 2023 am 09:05 AM

Oracle cannot connect

In recent years, with the rapid development of cloud computing and big data technology, database management systems (DBMS) have become one of the important infrastructures in the Internet era. As one of the most popular commercial databases in the industry, Oracle's performance and reliability are also widely recognized by the market. However, as the system running time continues to increase, Oracle database connection exception problems have become more and more common. This article will show you how to deal with Oracle connection exceptions from the root causes, characteristics, and cases of database connection exceptions. 1. Oracle data

May 08, 2023 pm 07:54 PM

oracle sql execution process

Oracle SQL is the most commonly used and most powerful database language in relational database management systems. When using Oracle SQL to perform data queries, operations, etc., you need to understand the execution process of Oracle SQL. This article will introduce the execution process of Oracle SQL so that readers can better understand and master the use of Oracle SQL. The basic execution process of Oracle SQL The execution process of Oracle SQL can be divided into the following steps: 1. Parse the SQL statement:

May 08, 2023 pm 07:38 PM

oracle query foreign key

Oracle Query Foreign Key In database design, foreign key is one of the important constraints connecting two tables. A foreign key is a column or columns in a table whose value corresponds to the value of a primary key or unique key column in another table. Foreign keys ensure data integrity and consistency. When a foreign key is used when a row is inserted, updated, or deleted in the master table, it automatically performs the corresponding operation in the slave table. Querying foreign keys is one of the important aspects of database management. In Oracle Database, how you query foreign keys depends on the information you wish to obtain. Here are some queries from the list that may be useful. Inquire

May 08, 2023 pm 07:31 PM

oracle installation path

Oracle is one of the world's largest enterprise-level database software vendors, providing efficient database management services. For users who want to install Oracle database, they need to know the installation path of Oracle. Oracle is a large software, so its installation process is quite complicated. Before installing Oracle Database, you need to check whether your operating system meets its requirements. You also need to make sure you have free disk space to store the Oracle database software. Generally speaking, Oracle

May 08, 2023 pm 06:55 PM

How to view oracle database

Oracle database is one of the most widely used enterprise-level relational database management systems in the world. It provides a safe, reliable, and high-performance data management platform. In enterprise business systems, Oracle databases occupy a very important position. They provide powerful data storage, data management, data backup and data recovery functions. This article will introduce how to view the Oracle database and help administrators better manage and use the database in daily work. 1. View database instances In Oracle database, each instance represents a database operation

May 08, 2023 am 11:32 AM

oracle stored procedure returns result set

In Oracle Database, a stored procedure is a compiled, reusable block of code that accepts input parameters and performs a series of operations, ultimately returning a result. The result may be a scalar value, a result set stored in a temporary table or cursor, or a value passed to the caller via an OUT parameter. In our daily work, we often need to write stored procedures to complete some batch operations, long-running tasks or complex data processing logic. However, when we need to return a result set in a stored procedure, we often encounter some problems

May 08, 2023 am 11:19 AM

oracle stored procedure returns result set

In Oracle database, stored procedure is a widely used data processing method. Although stored procedures can perform a variety of complex data operations, their most common use is to return query result sets. In this article, we will explore the method and implementation of Oracle stored procedures to return result sets. 1. Introduction to Oracle Stored Procedures The stored procedure in the Oracle database is a database object, which is a set of precompiled SQL statements written in PL/SQL language. A stored procedure can be thought of as a programmed SQL statement

May 08, 2023 am 11:15 AM

oracle user query permissions

Oracle database is the industry's leading relational database management system. It has the characteristics of security, stability, high reliability, and good scalability, and is widely used in enterprise data storage and management. In large database systems, managing users and user permissions is particularly important. This article will focus on the relevant knowledge of Oracle user query permissions in order to better understand and apply the database system. 1. The concept of users and permissions A user refers to an account or session connected to the Oracle database. User accounts are typically authenticated via username and password. In the data

May 08, 2023 am 11:14 AM

oracle primary key delete

In Oracle database, the primary key is an important constraint that ensures that only unique records exist in each table. When it is necessary to delete a primary key, some care and steps are required to ensure data integrity and consistency. The following are some steps to help you delete a primary key in Oracle database: 1. Check dependencies. Before deleting a primary key, you need to confirm whether the primary key is dependent on other objects. You can use the following script to query: ```SELECT constraint_name, table_nameFROM user

May 08, 2023 am 10:57 AM

oracle tablespace delete file

Oracle Database is one of the most popular relational databases today. Its powerful functionality and scalability make it the first choice for many commercial and enterprise applications. Table space is a very important concept when using Oracle database. It is the basic storage unit used to store database objects, including tables, indexes, stored procedures, triggers, etc. Oracle database will store all database objects in table spaces. When we need to delete a table space, we need to delete all files in the table space first. Next, we will introduce in detail

May 08, 2023 am 10:54 AM

oracle dba tutorial

As an Oracle DBA, you need to master the knowledge and skills of the entire Oracle database management to ensure that the database is always running optimally when running. In this article, we will introduce some core tasks and skills to help you become an Oracle DBA. 1. Install and upgrade Oracle database: As an Oracle DBA, you need to master the installation and upgrade process of Oracle to ensure that the system is always at the latest version and can install and configure additional software packages as needed. 2. match

May 08, 2023 am 10:50 AM

centos 6.5 installation oracle

The installation and configuration of CentOS 6.5 is the subject of this article. If you want to install Oracle database on CentOS 6.5, this article will provide you with detailed steps and guidance. Installing CentOS 6.5- First, you need to download the CentOS 6.5 ISO image. You can find the download link on the official CentOS website. - Once the download is complete, burn the ISO image to a DVD or USB flash drive. You can use something like Rufus

May 08, 2023 am 10:49 AM

How to view oracle database

With the rapid development of information technology, databases have become the cornerstone of enterprise informatization, and Oracle is one of the world's largest relational database management systems. As one of the widely used databases, it is important to look at Oracle database. This article mainly introduces how to view the Oracle database. 1. Check the Oracle database version information. Oracle is a large database system, and its version information is very important. It is not only a reference for its maintenance and upgrade, but also used during database upgrade, backup and recovery. To view Or

May 08, 2023 am 10:44 AM