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Technical Articles

Database

Oracle

Let's talk about the process of Oracle query

Oracle query process In the Oracle database, each user process is supported by an independent Oracle service process. These service processes are created and maintained by Oracle server processes. In such an architecture, the Oracle server process acts as a hypervisor responsible for maintaining, monitoring, and providing all processes connected to the database. For better system performance, Oracle allows multiple clients to establish connections to the same server process. However, in the case of multiple client connections, the Oracle server

Apr 21, 2023 am 11:20 AM

How to call Oracle database stored procedure using C language

As the company's business continues to expand, the demand for data processing is also increasing. Therefore, our data storage methods also need to be gradually optimized. Among so many database management systems, Oracle database is widely favored because of its high performance, reliability, security and other factors. The stored procedures in Oracle bring great convenience and efficiency to data processing. This article will introduce how to use C language to call Oracle database stored procedures. 1. Create an Oracle stored procedure. First, we need to create an Oracle stored procedure in the Oracle database.

Apr 21, 2023 am 11:20 AM

How to convert oracle date format

For date types stored in Oracle database, you can use the to_char() and to_date() functions to implement format conversion. This article will introduce the detailed usage and examples of Oracle date format conversion. 1. to_char() function The to_char() function can convert date data type into character data type. The format is as follows: to_char(date,'format') where date refers to date data type and format refers to date format template. Below are some commonly used dates

Apr 21, 2023 am 11:20 AM

How to query temporary tables in Oracle database

In Oracle database, querying temporary tables is a frequent requirement. Temporary tables refer to temporary data tables stored in the database, usually used to store temporary data or intermediate result sets. Compared with traditional data tables, the life cycle of temporary tables is shorter and usually only exists in the current transaction or current connection. Once the transaction or connection ends, the temporary table will no longer exist. In practical applications, temporary tables play a crucial role in data processing. For example, we may need to store data in a temporary table for subsequent data processing operations, or we may need to

Apr 21, 2023 am 11:20 AM

How to modify the oracle table name

Oracle is a popular relational database management system (RDBMS) used by many businesses to store and manage data. In the actual use of Oracle, it is often necessary to modify existing table names. Although Oracle does not encourage frequent modification of table names, it is still necessary from time to time. This article will introduce how to modify the table name in the Oracle database. 1. The basic syntax for modifying the table name. In Oracle, the basic syntax for modifying the table name is as follows: ```ALTER TABLE old_table_name

Apr 21, 2023 am 11:19 AM

How to modify monitoring in oracle

The Oracle database listener is a program responsible for monitoring database services. Its main function is to provide ports and connections for client operations and maintain communication between the database and the client. When modifications to a listener are required, there are a number of factors and steps that need to be taken into consideration. Factors that trigger listener modifications usually include network topology changes, database instance parameter modifications, and security configuration changes. In order for the new configuration to take effect and fill client requests, the listener configuration needs to be modified appropriately. The specific steps are as follows: Step 1: Check the status of all listeners. Before modifying the listener,

Apr 21, 2023 am 11:19 AM

Explore how to write Oracle stored procedures

An Oracle stored procedure is a set of precompiled SQL statements that are combined into a unit and can then be called as a whole. Stored procedures can be used to complete database operations such as queries, updates, inserts, and deletes. In Oracle, stored procedures are a very useful database programming tool. They can eliminate duplicate code, make the code easier to maintain, and improve the performance and security of the code. In this article, we will explore how to write Oracle stored procedures and record some practical tips,

Apr 21, 2023 am 11:19 AM

How to delete tables in Oracle to release table space

In Oracle database, deleting a table is a very common operation, but deleting a table does not necessarily release the corresponding table space immediately, which will lead to a waste of database space. Therefore, when deleting a table, freeing the table space is also a very important task. This article will introduce readers to how to delete tables and release the corresponding table space in Oracle database. 1. Delete a table In the Oracle database, the operation of deleting a table can be achieved through SQL statements. The specific syntax is as follows: ```DROP TABLE table name;```where,

Apr 21, 2023 am 11:19 AM

Detailed introduction to Oracle's method of querying serial numbers

Oracle is a very powerful database management system that is widely used in various large-scale enterprise applications. In Oracle database, sequence number (sequence) is a very useful object that can be used to generate unique numeric identifiers. This article will introduce in detail Oracle's method of querying serial numbers. A serial number is an object in Oracle that generates a unique numeric identifier. Serial numbers are often used to generate primary key values and can be shared between multiple tables. To create a serial number object, you can use the following syntax:

Apr 21, 2023 am 10:12 AM

Let's talk about the execution process and optimization solutions of Oracle queries

With the continuous expansion of enterprise business and the increasing amount of data, the requirements for database queries are getting higher and higher. When using Oracle database, optimization and adjustment of query execution statements are the key to improving database performance. This article will introduce the execution process and optimization solutions of Oracle queries to help readers better understand and apply this knowledge. 1. Oracle database query execution principle In the Oracle database, the query execution process is divided into three stages: parsing stage, optimization stage, and execution stage. The parsing stage refers to analyzing the query statement.

Apr 21, 2023 am 10:12 AM

Oracle command line installation steps and precautions

Oracle is a powerful relational database management system that not only helps users store and manage massive amounts of data, but also performs advanced data analysis and query operations. One of the reasons why many users choose to use Oracle is that Oracle has rich command line functions that allow administrators to better control the running process of the database. In this article, we will cover the steps and considerations for Oracle command line installation. Oracle Database Management System supports Windows, Linux and

Apr 21, 2023 am 10:12 AM

Explore Oracle stored procedure syntax and the implementation of these stored procedures

Oracle is the world's famous relational database management system. As a powerful database system, Oracle provides stored procedures to manage and perform large database operations. In this article, we will explore Oracle stored procedure syntax and the implementation of these stored procedures. Oracle stored procedures are special stored procedures designed to solve a series of data processing problems. Oracle stored procedures are composed of statements and code blocks, can be executed multiple times, and have a certain degree of conditional restrictions and control structures. Oracle stored procedure master

Apr 21, 2023 am 10:12 AM

Let's talk about the concept of Oracle custom stored procedures

Oracle is a database management system widely used in enterprise-level application development, and its custom stored procedure function is one of the powerful features of the Oracle database. In database application development, stored procedures are often used to encapsulate logic and improve system performance and security. In this article, we will introduce the concept of Oracle custom stored procedures and how to create, execute, debug and modify stored procedures. 1. Introduction to Oracle Custom Stored Procedures Oracle custom stored procedures are pre-installed in the Oracle database.

Apr 21, 2023 am 10:12 AM

Let's talk about the methods and precautions for modifying the SYS user in Oracle

The SYS user in the Oracle database is the account with the highest authority and has control over the entire database. Therefore, under normal circumstances, it is not recommended to modify the SYS user. But sometimes in order to solve specific problems, it may be necessary to modify the default settings of the SYS user. This article will introduce some methods and precautions for modifying SYS users. 1. Change the SYS user password. The SYS user is the most important user in the Oracle database, and the password setting should be strong. If you forget the password of the SYS user or need to change the password, you can use the following methods

Apr 21, 2023 am 10:11 AM