An article introducing Oracle SID settings and operation methods

Oracle SID Settings

Oracle database is a relational database management system widely used in the industry. When using Oracle database, system administrators and developers often need to set the SID to ensure the uniqueness and security of the database instance. This article will introduce Oracle SID settings and operation methods.

1. What is Oracle SID?

Oracle SID (System Identifier) ​​is an important concept in the Oracle database. It is the unique identifier of the Oracle database instance and is equivalent to the "name" of a database. When we start the Oracle database, the background process will match and find the corresponding data file based on the currently set SID and process the connection request from external users.

Each Oracle instance has a unique SID, and we can create multiple Oracle instances by modifying this value. Multiple instances can share a server resource and provide independent database services for different business systems. At the same time, Oracle database can run multiple instances at the same time, thereby improving the availability, fault tolerance and scalability of the system.

2. How to set Oracle SID

The setting method of Oracle SID is usually achieved by modifying the oraenv script in the Oracle_home/bin directory under the Oracle installation directory. The specific steps are given below:

1. Open the shell terminal and switch to the oracle user;
2. Enter the directory where the oraenv script is located, usually $ORACLE_HOME/bin;
3. Open the oraenv script and edit the ORACLE_SID variable value in it. For example, setting ORACLE_SID to mydb creates an Oracle instance named mydb;
4. After setting ORACLE_SID, exit the oraenv script and reload the profile file. The command is: source ~/.bash_profile.

Switching to the specified Oracle instance can be achieved through the following command:

sqlplus / as sysdba

Then check the currently used Oracle SID through the show parameter instance_name command.

3. Standardized naming of Oracle SID

The naming of Oracle SID needs to follow certain specifications. It should be simple, clear, easy to identify and use, and avoid duplication or confusion. It is recommended to set 1-8 characters according to specific business needs and Oracle version. Special characters and Chinese characters cannot be used.

The commonly used Oracle SID naming rules are as follows:

1. starts with a letter and only contains letters and numbers;
2. The length should not exceed 8 characters, preferably not more than 5 characters;
3. Avoid using hyphens, underscores, special symbols, etc.;
4. Naming specifications are best incorporated into the development specifications of the OA system.

4. Oracle SID Management

Any Oracle SID can correspond to multiple Oracle database instances. We can manage Oracle instances through lsnrctl. lsnrctl is the abbreviation of Oracle Net Listener Control Utility, which is mainly used to manage the Oracle Net Listener process. Use the following command to connect to the listener process and enter the listener console:

lsnctl

Next, we can execute the following command for management operations:

1. Start the specified on the current host Oracle instance with SID name:

startup

2. Stop the Oracle instance with specified SID name on the current host:

shutdown

3. Check all Oracle instances on the current host Instance status:

status

5. View the basic information of the current listener:

services

Summary:

This article mainly introduces the definition of Oracle SID , setting methods, standardized naming and management operations, etc. In actual work, you should pay attention to the uniqueness, security and compliance of setting Oracle SID. At the same time, setting the instance name reasonably according to the needs can improve the efficiency of database operation and improve the availability of the system.

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