Oracle

The Oracle listener log file is a continuously increasing plain text file. It usually checks whether the listener has an abnormal stop or malicious attack connection. When this file is very large, it may be slow to open and browse the file content.

When you are a beginner in Oracle, you may be confused about the role of writing files in Oracle. The following section provides an example of writing strings to files. Of course, you can also use the utl_file package provided in Oracle to read and

Oracle Database character sets are frequently used. How much do you know about Oracle database character sets? The following articles mainly start with definition and parse the comprehensive understanding of the character set of Oracle databases.

This article mainly introduces the relationship between the Conversion Function in the actual application of Oracle time and the actual operation of date, we all know that the greatest correlation between the Conversion Function and the actual date

When the startup command is issued, Oracle starts to start. If the instance is started successfully, the process of starting the instance is divided into three stages. 1. nomount stage in Oracle Startup Mode Nomount: In this startup phase, the main

We all know that the Oracle listener is actually a server-based Oracle service and belongs to the network service. Its main function is to listen for connection requests from the client to the database server. Since it is a server-based service, it

This article discusses Oracle data import and export instances. Importing and exporting Oracle Data imp/exp is equivalent to restoring and backing up oracle data. The exp command can export data from the remote database server to the local dmp file,

The following articles mainly discuss the practical application issues related to Oracle Spatial Data Encryption. First, we will introduce the features of Oracle 9i2, and then we will introduce the specific operation steps for encryption

The following articles mainly introduce how to crack the Oracle password and forget it. In fact, it is very easy to forget the Oracle password, this article mainly introduces two related solutions: alter user username) identified by "password ". One

Cascading deletion in the constraints related to SQL and Oracle Foreign keys. If you want to delete related records in the relevant system, we need to join multiple tables to delete N, and there are also constraints between them. therefore, when

Permission is the user's power to execute a function. In Oracle, Oracle permissions are divided into system permissions and entity permissions based on different system management methods. System permission refers to whether authorized users can

A table contains several million pieces of data, and an index is added to a field. However, the query performance is not improved significantly, which may be caused by Oracle index restrictions.Oracle indexes have some index restrictions. When these

The following articles mainly introduce the contents of SCN and TimeStamp in Oracle 10g. We all know that in Oracle 10g, the function is used to convert the SCN and timestamp to improve the flash back operation. This article uses an example to

The following articles mainly introduce three ways of Oracle 11g Certification Examination. The main ways of 11g OCA Certification Examination are: 1 z0-007 + 1z0-052, and 2: 1z0-051 + 1z0-052, there are also ways 3: 1z0-047 + 1z0-052, 11g OCP

The following article mainly analyzes the optimization of Oracle SQL statements IN detail. The first is the operator optimization. Let's talk about the IN operator first! We all know that Oracle SQL written IN has the advantages of easy to write and

The following articles mainly explain how to optimize the CPU usage in Oracle. I personally like Oracle very much. I also summarize some lessons learned from my work on optimizing the CPU usage in Oracle, here is a detailed explanation of this issue.

The following article mainly introduces the Oracle function decode. We all know that the decode function compares this value with a series of related sequence dolls in c to determine the final returned results. The so-called sequence even, in short,

The following articles mainly describe the usage of Oracle to_char. Oracle to_char can be widely used in a short period of time, indicating that its practical application is dominant, the following is an introduction to the specific content of the

The following articles mainly summarize the practical application skills of the Oracle explain plan. If you need to optimize the SQL statements in the Oracle database, we need to know the relevant plans to be executed, so as to make targeted

The following articles mainly describe the synchronous replication of Oracle Advanced Replication. If you need to set up related servers (Oracle) in several regions across the country ), the requirement is the consistency of related DB data. The