What is the SID of the oracle database?

The sid of the oracle database is the abbreviation of System Identifier, which is used to uniquely identify an Oracle instance. The functions of sid are: 1. Used to identify a specific database instance so that users can interact with the system; 2. Used to distinguish different database instances in a multi-instance environment; 3. Used to configure and manage database instance related information. Parameters and settings.

The operating environment of this tutorial: Windows 10 system, Oracle Database 20c version, DELL G3 computer.

The SID of the Oracle database is System The abbreviation of Identifier, which is used to uniquely identify an Oracle instance. Each Oracle database instance has a unique SID that is used to distinguish different database instances. SID is similar to the name of a database, which plays an important role in the entire system.

An Oracle database instance is composed of one or more processes, which work together to complete the operation and management of the database. The SID is used to identify the resources configured by this group of processes. Through SID, we can access a specific instance from multiple database instances without conflicting with other instances.

In the Oracle database, SID plays a key role in many places.

1. It is used to identify a specific database instance so that users can interact with the system. When a user logs into the system, he or she needs to provide the corresponding SID to connect to the database.

2. SID is also used to distinguish different database instances in a multi-instance environment. In some cases, a system may run multiple Oracle database instances, either on the same physical server or on different servers. Each instance has its own SID, and each instance can be uniquely identified and operated by the SID.

3. SID is also used to configure and manage relevant parameters and settings of the database instance. By modifying SID-related configuration files, we can control the behavior and performance of the database instance. For example, we can adjust memory allocation, number of connections, parallel processing, etc. by modifying the configuration of SID.

To obtain the SID of an Oracle database instance, there are several methods you can use. A common method is to use the following command to query the SID of the database instance:

$ echo $ORACLE_SID

This command will return the SID of the database instance to which the current session is connected. Alternatively, you can use Oracle database management tools such as SQL*Plus or Oracle Enterprise Manager to query the SID of the database instance.

In summary, SID is an important identifier in the Oracle database, used to uniquely identify a database instance. SID not only plays a key role when users connect to the database, but is also used to distinguish different database instances in a multi-instance environment, as well as configure and manage related parameters and settings of the database instance. It is very important to be familiar with and understand the concept of SID for the use and management of Oracle database.

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