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Database

Oracle

oracle restore deleted table

In the daily database management process, sometimes database tables are accidentally deleted. Without timely backup measures, this process will be very difficult and time-consuming. Fortunately, Oracle Database provides some tools and techniques for recovering deleted tables. This article will introduce several common methods to recover deleted tables. Method 1: Use flashback database technology to recover deleted tables Flashback technology is an important feature in Oracle database, which allows you to recover deleted tables without performing backup and recovery. The steps are as follows: 1. Use the following command to check

May 07, 2023 pm 07:47 PM

Modify oracle sys password

In the Oracle database, the sys user has the highest authority, so the importance of the sys password is self-evident. For database administrators, it is often necessary to change the password of the sys user to ensure system security. This article will introduce how to change the sys password in Oracle database. 1. Log in to the Oracle database. Before changing the sys password, you first need to log in to the Oracle database. You can log in using SQL Plus or any other tool that supports connecting to Oracle databases. 2. stop

May 07, 2023 pm 07:46 PM

oracle stored procedure calls java

Oracle stored procedures can be called from a Java program, which is a way of accessing a database using Java technology. This article explains how to combine stored procedures with Java and provides relevant sample code. 1. Use JDBC to access Oracle database Java Database Connectivity (JDBC) is a standard API for connecting to various databases, including Oracle database. Before using JDBC to access Oracle database, you need to

May 07, 2023 pm 07:43 PM

oracle stored procedure statement

Oracle is a very powerful database management system that not only supports SQL statements, but also supports higher-level programming languages, such as PL/SQL (Procedural Language/Structured Query Language). PL/SQL is a procedural language that can write objects such as stored procedures and triggers in the Oracle database. A stored procedure is a set of SQL statements and logical operators that can be saved by the Oracle database and executed as a unit. in the text,

May 07, 2023 pm 07:42 PM

oracle stored procedure if statement

In Oracle, a stored procedure is a block of code that combines multiple SQL statements and encapsulates them in a unit. Stored procedures can help us perform complex data processing operations in the database, thereby improving database performance and efficiency. In stored procedures, the if statement is a common flow control statement that can execute different SQL statements based on conditional judgment. This article will introduce the usage of if statements in Oracle stored procedures. 1. Basic usage of if statement: if statement in Oracle stored procedure and if statement in other programming languages

May 07, 2023 pm 07:37 PM

oracle stored procedure sql statement

Oracle database is an efficient database management system with rich functions and extremely high reliability, and is widely used in enterprise-level applications. Oracle stored procedures are a special program unit that can combine and store multiple SQL statements and are used in daily data processing tasks. This article will introduce how to write SQL statements in Oracle stored procedures. 1. Why use stored procedures? When developing enterprise applications, we usually encounter various data processing tasks, such as data import, data cleaning, data conversion, data analysis, etc. in these tasks

May 07, 2023 pm 07:32 PM

oracle stored procedure calls java

In the Oracle database, a stored procedure is a piece of precompiled PL/SQL code that can be used to perform and manage database operations. However, when dealing with some specific business requirements, the stored procedure itself may not fully meet the requirements, and Java code needs to be called to solve the problem. In this article, we will introduce how to call Java in Oracle stored procedures. 1. Oracle JVM Overview Oracle provides a feature called JVM (Java Virtual Machine) that allows

May 07, 2023 pm 07:17 PM

oracle parameter modification

As databases become larger and larger, more and more applications begin to rely on Oracle Database to provide data management and processing capabilities. To ensure database stability and efficiency, database administrators need to know how to modify Oracle parameters to optimize database performance and avoid failures. This article describes how to modify Oracle database parameters to improve performance and reliability. We'll cover important parameters, including SGA, PGA, and shared pools, as well as solutions to some common problems. 1. SGA parameter SGA (Sys

May 07, 2023 pm 07:15 PM

oracle modify parameters

Oracle Modification Parameters Oracle database is one of the most popular databases in the world. In order to ensure its efficient and stable operation, administrators often need to adjust some key parameters. This article will introduce how to modify parameters in the Oracle database to improve the performance and reliability of the database. 1. Check the database parameters. Before modifying the database parameters, we need to check the current database parameters and understand their meaning and configuration. You can run the following command to view:```sqlSELECT name, value,

May 07, 2023 pm 07:08 PM

oracle sys forgot password

Oracle database is the most widely used relational database management system. In the process of managing Oracle database, system administrators often face the problem of forgetting passwords. Especially if the Oracle system administrator forgets his or her password, this will result in the inability to log in to the database for management operations. In this case, without an effective solution, the system administrator will be unable to restore access to the database, which will affect the normal operations of the enterprise. So, what should the Oracle system administrator do when he forgets his password? In this

May 07, 2023 pm 07:05 PM

oracle stored procedure return value

Stored procedures in Oracle database are predefined PL/SQL programs that can be executed multiple times without rewriting. Stored procedures can be used with Oracle database to achieve more efficient functions such as data management, access control, data transformation, etc. In practical applications, we usually need to return a value in a stored procedure for further processing, such as checking program execution results, obtaining execution results, etc. Therefore, this article will introduce the return value related content in Oracle stored procedures, including how to define the return value and how to obtain it.

May 07, 2023 pm 07:04 PM

How to delete table in oracle? Statement analysis

Oracle database is one of the most widely used relational databases in the world. In daily use, it is often necessary to delete useless data tables to free up database space or optimize query speed. In this article, we will introduce the statements and related operations of deleting tables in Oracle database. Drop table statement: In Oracle database, to delete a table, we can use DROP TABLE syntax to complete this operation. Its basic syntax is as follows: DROP TABLE table_name; among them, table_na

Apr 25, 2023 pm 04:13 PM

Let's talk about the use of Oracle temporary tables and stored procedures

The use of Oracle temporary tables and stored procedures In the Oracle database, temporary tables and stored procedures are relatively common technical means, which can help us process and manage data more efficiently. This article will focus on the use of temporary tables and stored procedures. The concept and use of temporary tables The so-called temporary table is a table that only exists in the current session. Temporary tables are very useful. They can be used to store the results of a temporary calculation, or as a medium for data sharing between two concurrent tasks. Of course, when using temporary tables, we also need to pay attention to the following

Apr 25, 2023 pm 04:13 PM

How to use output parameters in oracle stored procedures

Overview: A stored procedure is a precompiled program that can be called multiple times. In Oracle, stored procedures can have input parameters, output parameters, or both. In this article, we will delve into how to use output parameters in stored procedures. Steps: 1. Define output parameters: In order to use output parameters in a stored procedure, we need to declare an output parameter in the parameter list of the stored procedure. Here is an example: CREATE OR REPLACE PROCEDURE my_proc (IN_PA

Apr 25, 2023 pm 04:13 PM