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Technical Articles

Database

Oracle

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

oracle sql tutorial

Oracle SQL Tutorial Oracle SQL is the SQL language for the relational database Oracle. SQL is the abbreviation of Structured Query Language, which is used to perform operations such as additions, deletions, modifications, and queries on relational databases. Oracle SQL includes a large number of SQL statements that can be used to retrieve data from tables, insert and update data, and delete data. In this article, we will cover the basics and advanced features of Oracle SQL

May 08, 2023 am 10:35 AM

oracle check failed

Oracle database is one of the most popular databases today, and its reliability and stability have been recognized by many enterprises. However, when using the Oracle database, it is extremely common for the check to fail. Let's take a look at the reasons for the Oracle check failure and how to solve it. 1. Reasons for Oracle check failure 1. Physical failure: Physical failure is the most common reason for Oracle check failure, including memory failure, network transmission failure, hardware failure, etc. In the event of a physical failure, the Oracle check process may be

May 08, 2023 am 10:33 AM

oracle variable settings

Oracle is a commonly used relational database management system that provides multiple mechanisms to use variables in SQL statements. This article will detail how to set variables in Oracle. 1. Set variables through the DEFINE command. The DEFINE command can define variables in a SQL Plus session. Its basic syntax is as follows: DEFINE variable_name = value where variable_name is the variable name and value is the value of the variable. For example, you can pass the following command

May 08, 2023 am 10:32 AM

oracle in query variables

Oracle is a relational database management system. When performing data queries, we usually need to use the IN statement, which can match multiple values ??in one query. When performing IN queries, we can also use variables to replace specific values, which can make the query statement more flexible and maintainable. In Oracle, we can use PL/SQL statements to perform IN queries. Below, we will introduce how to use variables in Oracle for IN queries. 1. To declare variables in Oracle, we can use DE

May 08, 2023 am 10:32 AM

Modify oracle parameters

Oracle parameters are key to managing Oracle database performance. Adjusting Oracle parameters to appropriate values ??can improve database performance and reliability. Therefore, the installation and configuration of Oracle database includes adjusting Oracle parameters to optimize database performance. The parameters of Oracle 11g and 12c are basically composed of hundreds of basic parameters, covering all aspects of database operations, such as memory, number of concurrent users, I/O, network connection, backup, debugging, etc. These parameters control database performance and can

May 08, 2023 am 10:30 AM

oracle convert to string

In Oracle database, sometimes it is necessary to convert numeric or date data into string type to facilitate output or string concatenation operations. This article will introduce how to convert numeric, date and Boolean data into string types in Oracle database. 1. Convert numeric type to string type 1. TO_CHAR function In Oracle database, the most commonly used function to convert numeric type to string type is the TO_CHAR function. Its syntax is as follows: TO_CHAR(number, [for

May 08, 2023 am 10:25 AM

oracle installation path

As one of the world-famous database software, Oracle database's installation process has also attracted much attention. When installing the Oracle database, we need to specify the installation path for it to manage and configure it in subsequent operations. So, how should the installation path of Oracle be specified? In this article, let’s take a closer look. First of all, it should be noted that the installation path of Oracle is not fixed and can be set according to actual needs. Generally speaking, we need to consider the following factors: 1. System disk remaining

May 08, 2023 am 10:24 AM

oracle does not use index

With the popularity of databases used by major enterprises, the optimization of database indexes has become an essential task. However, in actual database operation and maintenance, we will also encounter some situations where the index cannot be used, such as the problem of not using the index in the Oracle database. This article will explore this issue from the following aspects: Why is there no indexing? How can I find and fix this problem? 1. Reasons for not using indexes When we execute a SQL statement, Oracle will execute the query according to the execution plan corresponding to the SQL statement. In the execution plan, the index

May 08, 2023 am 10:23 AM

oracle dba tutorial

Oracle DBA Tutorial Oracle Database Administrator (DBA) is a professional responsible for managing and maintaining Oracle database systems. With the advent of the big data era, Oracle databases are becoming more and more popular among enterprises and organizations. Therefore, more and more DBAs are needed to manage and maintain these database systems. This tutorial will introduce some important skills and knowledge to help novices become a qualified Oracle DBA. 1. Basic knowledge before starting to learn Oracle

May 08, 2023 am 10:19 AM

How to create an oracle database

Oracle database is a very popular relational database management system with powerful functions and wide applications. If you need to use an Oracle database to store data, the following describes how to create an Oracle database. 1. Install the Oracle database software. First, you need to download the Oracle database software from the official website and install it according to the prompts. The installation process is very simple, just follow the prompts step by step. 2. Create a database instance. After installing the Oracle database software, you need to create a database instance.

May 08, 2023 am 10:18 AM

oracle query foreign key

In database design, foreign keys can be used to achieve association and referential integrity between data tables to ensure data consistency and correctness. A foreign key means that a field value or a group of field values ??in one table must be a reference to a field value or a group of field values ??in another table. When querying foreign keys in a relational database, you can use SQL statements and specific Oracle commands to obtain relevant information to better understand and manage the database. Below we will introduce in detail how to query foreign keys in the Oracle database. 1. SQL query foreign keys to check

May 08, 2023 am 10:18 AM

oracle sql or usage

Oracle SQL OR Usage Oracle SQL is a popular database management language used to manage relational databases. The OR operator is a logical operator in SQL that is used to handle relationships between multiple conditions. Use OR to combine multiple conditions together, making it easier to filter and retrieve data. In this article, we will take a deep dive into Oracle SQL OR usage and its practical applications. Syntax of OR In Oracle SQL, OR is a logical operator.

May 08, 2023 am 10:16 AM