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Home

Technical Articles

Database

Oracle

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

oracle stored procedure return value

Oracle stored procedures are precompiled, reusable blocks of code because they allow developers to create, test, and execute code in the database without requiring a connection to an external application. One of the main advantages of Oracle stored procedures is improved database performance and security, but they require special handling when they need to return values. The return value characteristics of stored procedures are based on actual business needs, because some stored procedures may only be used to trigger some operations without returning any values, such as certain notification operations in update operations. However

May 08, 2023 am 10:40 AM

oracle replace string

Oracle is a powerful database management system that is very convenient to use. In database management, string replacement is a common operation. In this article, we will discuss string replacement operations in Oracle. Replacing a string means replacing a character or a group of characters in a string with another character or a group of characters. In Oracle, there are several ways to perform string replacement operations, including SQL functions and PL/SQL programs. SQL functions: Oracle provides many built-in SQL functions that can be used to perform

May 08, 2023 am 10:39 AM

The service started by oracle cannot be started

When using Oracle database, sometimes we encounter a situation where the service cannot be started. At this time, we need to troubleshoot and solve the problem. This article will introduce several reasons that may cause the Oracle startup service to fail to start, as well as the corresponding processing methods. 1. Service dependencies are stopped or not started. In Windows systems, Oracle services depend on other services, such as Windows services, network services, etc. If these dependencies are not started, Oracle's services will also fail to start. At this point, we can confirm by following the steps

May 08, 2023 am 10:38 AM

oracle modification instance

Oracle is a very popular relational database management system. When using an Oracle database, sometimes the database instance needs to be modified to meet specific needs. This article will introduce how to modify an Oracle instance. First, we need to understand the concept of Oracle instances. An Oracle instance refers to a collection of processes started from the computer running the Oracle database software when the database is managed. It is a running environment of the database, including the Oracle Server process and other accompanying programs

May 08, 2023 am 10:38 AM

oracle sql execution process

Oracle is a feature-rich relational database management system (RDBMS) that is widely used in enterprise-level applications and network systems. In Oracle, SQL language is the main operating language. When we execute a SQL statement in Oracle, it will go through the following steps: 1. Syntax analysis. Before executing the SQL statement, Oracle first needs to perform a syntax analysis process. At this stage, Oracle will perform syntax and semantic analysis of the SQL statement. To check the correctness of the statement and determine the execution plan. like

May 08, 2023 am 10:36 AM