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oracle closes service

Oracle database is a very common enterprise-level database. During use, the database service may need to be shut down due to various reasons. This article will focus on how to shut down the Oracle database service and what to pay attention to. 1. Shut down the Oracle database service 1. Use the SQL*Plus command to shut down SQL*Plus. It is a command line tool that comes with the Oracle database. Open the command line with administrator privileges and enter the following command to shut down the database service: ```sqlplus / as

May 08, 2023 am 09:19 AM

oracle date conversion

Oracle is a popular relational database management system and its DATE data type is very useful in handling dates and times. In Oracle database, DATE can store date and time values, but it needs to be converted when used. This article will introduce common methods of conversion of Oracle DATE data type. 1. TO_CHAR function The TO_CHAR function can convert date values into character types for use when querying or displaying results. Its syntax is as follows: TO_CHAR(date, fo

May 08, 2023 am 09:16 AM

oracle change user password

Oracle database is an enterprise-level relational database management system and one of the most commonly used databases in the industry. In Oracle, in order to ensure the security of the database, a strong password must be set for the user when creating it. However, in actual applications, password forgetting, leakage, or other reasons may lead to the need to change the password. So how to change user password in Oracle? This article will introduce how to change user passwords in Oracle. First of all, it needs to be explained that there are four ways to change user passwords in Oracle. They are

May 08, 2023 am 09:15 AM

oracle procedure returns result set

Oracle database is a powerful database management system that supports complex data operations, including various stored procedures and functions. These procedures and functions can return result sets, providing convenient and fast methods of data analysis, processing, and management. In the Oracle database, stored procedures and functions are predefined. The database administrator defines their structure and functions in advance according to needs, and then users can call them to perform corresponding data operations. These stored procedures and functions can all return result sets so that users can easily perform data analysis and processing.

May 08, 2023 am 09:06 AM

oracle installation configuration

Oracle database is one of the most well-known and commonly used relational database systems in the industry. It is widely used in many enterprises and organizations, providing powerful support for data management and business support. This article will introduce the installation and basic configuration process of Oracle database. 1. Install Oracle database 1. System requirements Before installing Oracle database, you need to confirm whether the system meets the following requirements: - Operating system: Windows Server 2008 or above, Linux, etc. - Memory: at least 4GB - Hardware

May 08, 2023 am 09:05 AM

How to view oracle database

Oracle Database is a very popular relational database management system mainly used for enterprise-level applications and data processing tasks. In the Oracle database, administrators need to frequently check the status and content of the database to ensure that it is running correctly and providing high-availability services. This article will introduce how to view the basic information, status and content of the Oracle database. 1. View database instance information To view basic information about an Oracle database instance, you can use SQL*Plus or Oracle Enterprise

May 07, 2023 pm 10:52 PM

oracle query user permissions

In Oracle database, user permissions refer to permissions that allow or disallow users to perform certain operations. When a user performs certain operations that require special permissions, the system checks whether the user has the corresponding permissions. Querying user permissions is an important task in managing Oracle databases. Administrators can check the user's permissions to understand what operations the user can perform and how to better manage the database. This article will introduce several methods to query Oracle user permissions. Method 1: Use the view officially provided by Oracle. Provided by Oracle

May 07, 2023 pm 10:48 PM

oracle stored procedure return value

Oracle stored procedures are a query language that repeatedly run a set of SQL statements in a single block of code. The advantage of stored procedures is that you can reuse the written and tested SQL code, simplify the writing process of SQL statements, and improve the execution efficiency of the code. But sometimes we need to get certain values or results from the stored procedure. This requires using the return value of the stored procedure. The return value of a stored procedure can be a number, a string, a date, or a Boolean value. Return from stored procedure

May 07, 2023 pm 10:44 PM

oracle in does not use index

Oracle is one of the most commonly used database management systems in the industry, and its excellent performance and powerful functions have been widely recognized and used. However, even such a powerful system can encounter some performance issues in some situations. Among them, one of the most common problems is not using the index in the query. Essentially, an index is a data structure used to speed up finding data in a table. In Oracle, there are two main types of indexes: B-tree indexes and bitmap indexes. When querying, the database system will access the index first, then the table, so it is good to

May 07, 2023 pm 10:42 PM

oracle sequence delete

Oracle sequence is a very commonly used database object used to generate unique auto-incrementing numbers. However, in some cases you may need to delete a sequence. This may be because you no longer need it, or you need to recreate it. In any case, deleting a sequence is a relatively simple operation. Below, this article will introduce you how to delete a sequence in Oracle database. Step 1: Determine the sequence to be deleted Before deleting a sequence, you need to confirm the name of the sequence to be deleted. You can use the following command to view all available

May 07, 2023 pm 10:36 PM

oracle scheduled stored procedure

Oracle is a very popular relational database. In business, we often need to execute some stored procedures regularly to complete some automated operations and save operating costs. This article will introduce how to use Oracle to regularly execute stored procedures. 1. The basic concept of scheduled execution of stored procedures in Oracle. The scheduled execution of stored procedures in Oracle means that the system automatically executes some pre-written stored procedures within a certain time interval. This method is often used for regular data archiving, backup, cleanup and other tasks. 2. Oracle scheduled execution storage

May 07, 2023 pm 10:33 PM

oracle user query permissions

Oracle is an enterprise-level database management system. It is the database of choice for many enterprises and organizations when storing and managing data. For users in the database, query permissions are very important, because users need to know what they need to query and use. Data is fully understood and mastered. This article will introduce how to query Oracle database user permissions. 1. Overview of Oracle database user permissions In the Oracle database, all users have permissions, including connecting to the database, creating tables and views, inserting, deleting and modifying data, etc. in order to control

May 07, 2023 pm 10:27 PM

oracle database linux installation

If you need to install an Oracle database on a Linux system, this article provides some basic guidance. The following steps are based on the Linux x86-64 (64-bit) version of Oracle Database 19c. Please follow the guidelines below. Step 1: Check System Requirements Before starting the installation, you need to meet the following system requirements for Oracle Database 19c: - Operating System: Oracle Linux 7.1, Red Hat Enterprise Linux (RHE

May 07, 2023 pm 10:23 PM

oracle stored procedure call java

With the continuous deepening of enterprise informatization, the use of databases is becoming more and more widespread, and the application of stored procedures is becoming more and more common. Oracle database has done an excellent job in implementing and optimizing stored procedures, but sometimes it is necessary to call Java programs in stored procedures to meet some specific needs. This article will analyze and explain the implementation principles, methods and cases of stored procedure calling Java. 1. The implementation principle of stored procedure calling Java. A stored procedure is a precompiled database object. It can be regarded as a script written at the database level and can implement complex

May 07, 2023 pm 10:19 PM