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Home

Technical Articles

Database

Oracle

oracle query creates table

Oracle database is one of the commonly used enterprise-level databases. It provides rich query languages ??and functions for users to create, query, modify and delete tables in the database. This article will introduce how to query and create tables in Oracle database. 1. View existing tables. To query existing tables in the Oracle database, you can use the following SQL statement: ````sqlSELECT table_name FROM user_tables;```After running the above SQL statement, all tables owned by the current user will be returned.

May 11, 2023 am 10:54 AM

Delete oracle instance

Oracle is a very popular relational database management system that is widely used in many different types of organizations and applications. However, over time, you may need to delete the Oracle instance. This article will briefly introduce the process of deleting an Oracle instance and help you easily complete the deletion of the instance. Before deleting an Oracle instance, be sure to back up your data. Deleting the Oracle instance will delete all related files and directories from the computer, including data files, control files, log files, etc., so you need to ensure that you

May 11, 2023 am 10:43 AM

oracle management tutorial

Oracle is currently one of the world's largest relational database management systems (RDBMS) and is widely used in enterprise-level applications, data warehouses, cloud computing and other fields. Learning Oracle database management skills is a very necessary skill for database administrators and IT practitioners. This article will introduce you to the basic concepts and techniques of Oracle database management, including database creation, table creation and management, user and permission management, backup and recovery, performance tuning, etc. Whether for beginners or those with some experience

May 11, 2023 am 10:39 AM

oracle view deletion

Oracle is a very powerful relational database management system that contains many useful functions and tools. One of the most practical and important functions is views. A view is a virtual table, which is not an actual table but a logical table composed of one or more actual tables. Views can be used to simplify complex queries, improve query efficiency, and also contribute to data security and confidentiality. However, sometimes we need to delete the view, this article will introduce how to delete the view in Oracle. 1. Preconditions Before deleting a view, we first need to ensure that

May 11, 2023 am 10:29 AM

oracle environment variable settings

Oracle is a relational database management system widely used in enterprise applications. Before installing and using the Oracle database, you need to set the Oracle environment variables. This article will introduce the steps and precautions for setting Oracle environment variables. 1. Overview of Oracle environment variables Environment variables are global variables stored in the operating system. They store some information that the operating system or application needs to use. Oracle database needs to set some paths and variables in the environment variables to help it run normally. These changes

May 11, 2023 am 10:29 AM

oracle date conversion

Oracle Date Conversion In Oracle database, date is a very important data type because many applications need to calculate and process dates. However, the date format may be different in different countries and regions, which requires date format conversion in the Oracle database. Oracle database has a wealth of built-in functions for processing dates and times, which allow us to easily calculate and convert dates. In this article, I will introduce some commonly used Oracle Date conversion functions and their

May 11, 2023 am 10:27 AM

oracle installation password

Oracle database is the current leader in enterprise-level database systems and is widely used in data management by major companies. During the Oracle installation process, there is a key step that requires setting an installation password, which will be used in subsequent management. This article will introduce how to set the installation password during the Oracle installation process. 1. Preparation before Oracle installation Before starting the installation of Oracle database, you need to carry out some preparation work to ensure the smooth progress of the installation process. 1.1 Preparation of operating system First, you need to ensure the security

May 11, 2023 am 10:27 AM

Oracle remove string

In Oracle database, sometimes it is necessary to remove a certain part of a string, such as removing specific characters in a string, removing spaces before and after a string, etc. This article will introduce how to remove strings in Oracle. 1. Remove specified characters from a string In Oracle, you can use the REPLACE function to remove specified characters from a string. The REPLACE function allows the user to replace all certain characters in a string with another string. The syntax is as follows: ```sqlREPLACE(strin

May 11, 2023 am 10:24 AM

oracle installation steps

Oracle database is one of the most commonly used relational databases in the industry, and its stability, reliability and security are highly praised by industry insiders. So, today we will learn about the installation steps of Oracle database. First, we need to confirm whether the local environment meets the installation requirements of the Oracle database. Oracle database installation requirements are relatively high and require certain hardware configurations (memory, disk, CPU, etc.) to ensure the performance and stability of the database. If you plan to install Oracle database on your personal computer, it is recommended to use

May 11, 2023 am 10:21 AM

oracle data loss

Oracle is an enterprise-grade relational database management system (RDBMS) that is widely used by many organizations as an alternative or additional feature to help manage their data. Oracle, being a highly reliable and scalable system, has many security mechanisms to ensure data integrity and availability. But even with such a highly secure and reliable system, data loss still occurs. Data loss is a low-probability but highly unpredictable event. The cause of data loss can be man-made or caused by system failure. no matter where

May 11, 2023 am 10:19 AM

oracle instance delete

Oracle is an enterprise-class database management system that can be used to store and manage large amounts of data. In some cases, you may need to remove the Oracle instance, especially when rebuilding the database or reinstalling the Oracle software. This article describes how to delete an Oracle instance and the possible effects of deleting an instance. Preparation work Before deleting the Oracle instance, you need to perform the following preparation work: 1. Confirm whether the instance to be deleted is in a stopped state: When the Oracle instance starts, the database will

May 11, 2023 am 10:19 AM

oracle delete table data file

As the amount of data grows, many database administrators face a common problem: how to delete table data files in Oracle databases. This problem is a difficult problem for database administrators to deal with day and night, because once the data file is deleted by mistake, it may cause the database to error or even crash. Therefore, it is very important to delete data files correctly. This article will introduce you to how to delete table data files safely and correctly in Oracle database. In Oracle database, there are two common ways to delete table data files. The first

May 11, 2023 am 10:06 AM

linux oracle shutdown

Oracle database is a very common database in enterprises, which provides reliable data storage and access. In addition, many enterprises also use Linux systems to run their servers and applications. In some cases, it may be necessary to shut down the Oracle database. This article will introduce how to shut down the Oracle database on Linux systems. First, we need to confirm that we are logged into the Oracle database server. We can connect to the server via SSH and log in as an administrator. After logging in, we enter

May 11, 2023 am 10:05 AM

oracle accidentally deletes table

Oracle is a widely used database management system that is widely used in various fields. However, even the most experienced database administrator may accidentally delete some or all database tables. In such situations, data recovery becomes crucial. Regardless of the data involved, accidentally deleting a table may result in incomplete data, so recovery operations need to be performed as soon as possible. Generally speaking, when a table is accidentally deleted, the Oracle database system will put the relevant data of the table into the recycle bin. Administrators can find and restore deleted tables in the Recycle Bin. However, if the hand

May 11, 2023 am 09:57 AM