How to set oracle sid

Oracle database is one of the most widely used relational databases in the world. When using the Oracle database, we need to make some basic settings and configurations, one of which is to set the Oracle SID. Below we will introduce how to set up Oracle SID.

1. What is Oracle SID?

Oracle SID refers to the system identifier of the Oracle database and is the unique identifier of the Oracle database. Multiple Oracle databases can be installed on the same server, and each database is distinguished by SID.

In Oracle database, SID consists of letters and numbers and cannot exceed 8 characters. For example, the SID of an Oracle database might be "ORCL".

2. How to set Oracle SID?

There are two main ways to set Oracle SID:

1. Set Oracle SID by modifying the Oracle instance parameter file

In the Oracle database, the Oracle instance parameter file contains Oracle database configuration information. Oracle SID can be set by modifying the Oracle instance parameter file.

The specific steps are as follows:

1. Open the Oracle instance parameter file. Oracle instance parameter files are usually stored in the $ORACLE_HOME/dbs/ directory. In Linux systems, you can use the following command to open the Oracle instance parameter file:

vi $ORACLE_HOME/dbs/init.ora

2. Modify the SID in the Oracle instance parameter file parameter. In the Oracle instance parameter file, use "SID=instance identifier" to set the Oracle SID. For example, to set the Oracle SID to "ORCL", you can add the following parameters to the Oracle instance parameter file:

SID = ORCL

3. Save and close the Oracle instance parameter file . In vi, you can use the ":wq" command to save and close the file.
4. Restart the Oracle instance. After modifying the Oracle instance parameter file, you need to restart the Oracle instance for the modification to take effect. You can use the following command to restart the Oracle instance:

sqlplus /nolog
conn / as sysdba
shutdown immediate
startup

2. Set the Oracle SID through environment variables

In addition to setting the Oracle SID by modifying the Oracle instance parameter file, it can also be set through environment variables.

The specific steps are as follows:

1. Open bash shell. In Linux systems, you can use the following command to open the bash shell:

bash

2. Set the ORACLE_SID environment variable. You can use the following command to set the ORACLE_SID environment variable:

export ORACLE_SID=ORCL

where "ORCL" is the Oracle SID you want to set.

3. Test whether the setting is successful. You can use the following command to test whether the ORACLE_SID environment variable is set successfully:

echo $ORACLE_SID

If the output content is "ORCL", the setting is successful.

3. Summary

The above are the two methods on how to set Oracle SID. In practical applications, we can choose the corresponding setting method according to our own needs. After setting the Oracle SID, we can access the corresponding Oracle database through the SID.

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