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- 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
- Oracle 4811 2023-05-07 22:27:07
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- 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
- Oracle 1327 2023-05-07 22:23:36
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- 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
- Oracle 1590 2023-05-07 22:19:36
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- oracle sys change password
- Oracle is a widely used database management system. As a database administrator (DBA), you often need to manage and maintain Oracle systems. One of the very basic operations is to change the password of the sys user in Oracle. This article will use this as the theme to introduce how to change the password of the sys user in Oracle. The sys user is the default administrator account of the Oracle database. When the database is created, two users, sys and system, are generally created. Among them, the sys user has the highest rights in the Oralce database.
- Oracle 6476 2023-05-07 22:17:06
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- Linux system oracle installation
- In enterprise-level application systems, Oracle database is a very popular relational database management system. However, it is more difficult to install the Oracle database in the Linux operating system, and the packages and configurations that need to be installed are also more complex. This article will share the Oracle installation process under Linux system. 1. Download the Oracle installation package. The Oracle official website provides the Oracle database installation package under the Linux system. We can download the corresponding version of the Oracle database installation package from the official website. 2. Matching
- Oracle 2309 2023-05-07 22:10:07
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- oracle sql usage
- Usage of Oracle SQL Oracle SQL is a structured query language using the Oracle relational database management system. It can perform operations such as querying, updating, inserting, and deleting data stored in the database. It also supports advanced operations such as joining multiple tables, sorting, grouping, and aggregation. This article will introduce the basic syntax and application examples of Oracle SQL to help readers understand its usage and advantages. 1. Basic syntax 1. SELECT statement The SELECT statement is the most commonly used in Oracle SQL.
- Oracle 807 2023-05-07 22:09:37
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- How to open oracle
- Oracle is an important relational database management system that is widely used in today's world. It is an efficient, reliable and scalable database developed by Oracle Corporation and is widely used in commercial applications, government agencies, financial services and various other fields. In this article, we will introduce in detail how to open the Oracle database. Since Oracle is a very flexible database, it can run on multiple platforms. We will introduce how to operate on Windows platform, Linux platform and Mac OS platform.
- Oracle 4419 2023-05-07 22:09:08
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- oracle user who modifies the table
- Oracle is a high-performance database management system that has the advantages of data integrity and security and is widely used in enterprise-level applications. In actual applications, we may encounter users who need to modify tables, such as to migrate data to a new user, or to change the permissions of a specific user. This article will introduce how Oracle modifies the user of the table, including the following: 1. Introduction to Oracle users and permissions 2. Methods of modifying the user of the table a. Export the data and rebuild the table b. Use ALTER
- Oracle 1804 2023-05-07 22:07:39
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- oracle start and stop
- Oracle database is a powerful and efficient relational database management system that is widely used in enterprise-level application systems. The running status of the Oracle database is very important, so it is necessary to know how to start and stop the Oracle database. The following is how to start and stop Oracle database. 1. Start the Oracle database 1. Use DBCA to start the Oracle database. DBCA is the installation and configuration wizard for the Oracle database. You can use it to start the database. Steps: a. Commands in the operating system
- Oracle 1421 2023-05-07 22:05:36
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- oracle modify sys
- Oracle modifies the SYS user. The SYS user in the Oracle database is the highest authority user and has many special permissions. Generally, it is not recommended to modify the SYS user. However, in some cases, the SYS user needs to be modified, such as resetting the SYS user password. This article will introduce how to modify the SYS user and reset the password. Changing the SYS user password In Oracle database, the SYS user's password is stored in the data dictionary table. In order to change the SYS user password, you need to perform the following steps: 1. Use sysd
- Oracle 916 2023-05-07 22:02:07
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- oracle linux installation database
- Oracle Linux is an open source operating system based on Red Hat Enterprise Linux and launched by Oracle Corporation. Its installation process is similar to other Linux distributions, but installing Oracle database requires some additional steps and requirements. Below are the detailed steps to install Oracle database. 1. Download and install Oracle Linux. The Oracle official website provides downloads of Oracle Linux.
- Oracle 718 2023-05-07 22:00:37
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- oracle or do not use index
- When Oracle database executes a query, it usually matches the query conditions and indexes to speed up the query and improve efficiency. However, in some cases, using an index is not always a better choice, and it may be more efficient to not use the index. This article will explore the circumstances under which indexes can be omitted in Oracle databases and how to optimize them. 1. The role and optimization of indexes Before understanding the situation without indexing, let’s first understand the role of indexes. An index is a data structure that can quickly locate data. It is similar to the table of contents in a dictionary and allows us to quickly locate data.
- Oracle 1689 2023-05-07 21:52:38
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- oracle modify parameters
- Oracle Database is an industry-leading relational database management system that is widely used in various enterprise applications. In order to ensure the efficiency and stability of the Oracle database during operation, database parameters need to be configured reasonably. Various parameter settings of the Oracle database can be achieved by modifying the init.ora or spfile file. These parameters have a crucial impact on the performance and stability of the database, so they should be set according to the specific environment. The following are some commonly used Oracle database parameters
- Oracle 868 2023-05-07 21:44:37
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- How to export oracle table
- In Oracle database, exporting tables is a common operation, which can export data in one table or multiple tables to other formats, such as SQL scripts, CSV files, etc. Export tables are a very useful tool if you need to migrate data in a different database environment or back up a database. In this article, we will introduce how to use Oracle's own tools to export tables. First, we need to understand the basic operations of Oracle export tables. In Oracle, you can use expdp or exp two tools to export tables. e
- Oracle 7038 2023-05-07 21:41:06
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- oracle in does not use index
- In the process of database query optimization, indexes play a vital role. It can quickly locate data in the database and improve query speed and efficiency. However, in practical applications, we can easily encounter the problem of not using indexes. This problem cannot be solved by simply adding indexes. This article will give readers a brief introduction to the reasons, impacts and solutions of never indexing in Oracle database. 1. Reasons for not using index 1. Index is not applicable: A basic function of index in database optimization is to optimize query speed, but in some cases, index
- Oracle 2433 2023-05-07 21:36:35
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