How to set sid in oracle

Oracle is a software widely used in enterprise-level databases. It is safe, reliable, efficient and suitable for business systems of all sizes. When using Oracle, you need to configure the SID parameters to allow the application to correctly connect to the corresponding database instance. This article will explain in detail Oracle setting SID to help readers better understand and apply this configuration.

1. Overview

In Oracle, SID (System ID) is the unique name that identifies the Oracle instance. When an Oracle database instance is started, the system automatically assigns a unique SID value to the instance to identify it. At this time, the application can connect to the corresponding database instance based on the SID value and perform data operations.

2. Method of setting SID

1. Manually set SID through oratab file

The oratab file is a file automatically generated during Oracle installation and is used to record each Oracle instance. related information. We can set the SID value of the Oracle instance by manually modifying the oratab file.

The specific steps are as follows:

(1) Use the root user to log in to the Linux operating system and enter the directory where the oratab file is located:

cd /etc

( 2) Open the oratab file:

vi oratab

(3) Find the Oracle instance record that needs to be set in the file, the format is usually:

:< ;ORACLE_HOME>:

where, is the SID value that needs to be set, is the Oracle software installation path, is when starting the instance Whether to perform automatic backup operations.

(4) After modifying the value to the SID name that needs to be set, press the "ESC" key to exit editing, then enter ":wq" to save and exit the file.

(5) Restart the Oracle instance to make the settings take effect:

su - oracle
sqlplus / as sysdba
shutdown immediate;
startup;

2. Set the SID through environment variables

You can also set the SID by setting Oracle environment variables. The specific operations are as follows:

(1) Use the root user to log in to the Linux system and open the bashrc or bash_profile file:

vi ~/.bashrc

or

vi ~/.bash_profile

(2) Add the following code at the end of the file:

export ORACLE_SID=
export ORACLE_HOME=

Among them, is the SID value that needs to be set, is the installation path of Oracle software.

(3) Press the "ESC" key to exit editing, then enter ":wq" to save and exit the file.

(4) Execute the source command to make the environment variable settings take effect:

source ~/.bashrc

or

source ~/.bash_profile

(5) Restart the Oracle instance to make the settings take effect:

su - oracle
sqlplus / as sysdba
shutdown immediate;
startup;

3. Frequently Asked Questions and Solutions

1. How to view the SIDs of all Oracle instances in the system?

In Linux systems, you can use the following command to view the SIDs of all Oracle instances:

cat /etc/oratab | cut -f1 -d:

2. How to Modify SID value in Oracle?

It is not feasible to modify the SID value in Oracle, because the SID is the unique identifier of the database instance, and modification will cause the database instance to fail to start. Therefore, the SID value needs to be modified at the system level.

3. Why do you need to set SID?

Setting the SID allows the application to correctly connect to the corresponding database instance for data operations, ensuring data integrity and security.

In short, Oracle is a very powerful database software, and setting SID is one of the necessary steps to use Oracle. This article introduces two methods of setting SID. Readers can choose the method that suits them. At the same time, answers to common questions are also provided. I hope this article can help everyone better understand and apply Oracle database.

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