oracle sid setting

Oracle database is a relational database management system that uses SID (system identifier) ​​to identify an instance or database. SID is the name of the Oracle instance and is a necessary parameter to start and connect to the Oracle instance. In this article, we will discuss how to set the SID of an Oracle database.

1.What is the SID of Oracle database?

SID is the unique identifier of the Oracle database instance. It is a configurable string of letters and numbers used to identify an Oracle instance. In the network, the client must specify the SID to connect to. After setting the SID, clients can connect to the database instance through the SID.

2. How to set the SID of Oracle database?

Setting the SID of the Oracle database requires the following steps:

2.1 Determine the name of the instance

First, you need to determine the name of the instance. In Oracle database, the instance name is usually created from the name provided during Oracle installation. If you are unsure of the name of your instance, please contact your Oracle administrator or run the following query:

SELECT INSTANCE_NAME FROM V$INSTANCE;

2.2 Setting the ORACLE_SID environment variable

In order to set the SID of the Oracle database, you need to set the ORACLE_SID environment variable. This can be done by:

export ORACLE_SID=name of instance

or

set ORACLE_SID=name of instance

Please note that in Windows , you can right-click the computer icon and select Properties. Then, select "Advanced System Settings" > "Environment Variables" and add ORACLE_SID under "System Variables".

2.3 Check ORACLE_SID

You can check if ORACLE_SID is set correctly by running the following command:

echo $ORACLE_SID

If this command is successful, it should return Instance name.

2.4 Start the Oracle database instance

Once the ORACLE_SID environment variable is set and check its setting, you can start the Oracle database instance. To start an Oracle database instance, use the following command:

sqlplus / as sysdba

Then, enter the following command:

startup

After starting the instance, You can use the following command to check the status of the instance:

SELECT STATUS FROM V$INSTANCE;

If the startup is successful and the status displays OPEN, it means that the instance has been started successfully.

3. Summary

In Oracle database, setting SID is an important step. Each Oracle instance has a unique SID, which is used to distinguish different instances and databases. Correctly setting the SID helps ensure correct connection and management of the database. In this article, we have discussed how to set the SID of an Oracle database by following the steps below:

1. Determine the name of the instance

2. Set the ORACLE_SID environment variable

3. Check ORACLE_SID

4. Start the Oracle database instance

These steps ensure that the SID of the Oracle database is set correctly and that you can connect to the required database instance when needed.

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