Oracle 11g中的多实例中央库架设（oracle11g中央库）

Oracle 11g is a popular database management system that offers various features and functionalities for efficient data storage and retrieval. The system offers a multi-instance architecture that allows for the creation of multiple instances in a single centralized database to improve performance and avlability. In this article, we will discuss the steps to set up a multiple-instance architecture in Oracle 11g, specifically focusing on the central database setup.

Step 1: Install Oracle 11g

The first step is to install Oracle 11g on your server. Ensure that you choose the option to create a new database during the installation process. Once the installation is complete, you will have a running instance of Oracle 11g.

Step 2: Create a Central Database

To create a central database, open the Oracle Enterprise Manager Console and connect to the database. Once connected, navigate to the “Database” tab and click on “Create Database.” In the subsequent page, choose the “Central Database” option and enter the necessary detls such as the database name, SID, and global database name.

Step 3: Create Additional Instances

To create additional instances, follow the same process as creating a central database, but choose the “Additional Instance” option. Ensure that you enter the same SID as that of the central database and choose a unique instance name. You can create as many instances as required.

Step 4: Configure the Listener

To enable communication between instances, the listener needs to be configured. Navigate to the “Network” tab in the Enterprise Manager Console and click on “Listeners.” Create a new listener and configure it to listen to the required ports.

Step 5: Create Shared Storage

To enable multiple instances to access the same data files, a shared storage system needs to be set up. This can be done by creating a network-attached storage (NAS) or a storage area network (SAN) and configuring it to be accessible by all instances.

Step 6: Configure the Initialization Parameter File

The initialization parameter file needs to be configured to enable multi-instance support. Open the file located at $ORACLE_HOME/dbs/init.ora and add the following lines:

Instance_name=

Service_names=

Replace with the name of the instance and with the global name of the database.

Step 7: Start the Additional Instance

To start an additional instance, open a command prompt and navigate to the Oracle home directory. Run the following command:

SQL> STARTUP NOMOUNT

Once the instance is started, run the following commands to mount it and open it:

SQL> ALTER DATABASE MOUNT;

SQL> ALTER DATABASE OPEN;

Step 8: Test the Configuration

To test the multi-instance configuration, connect to the central database using SQL*Plus and run the following command:

SQL> SELECT INSTANCE_NAME FROM V$INSTANCE;

This should list all the instances created under the central database.

In conclusion, setting up multi-instance architecture in Oracle 11g central database is a complex process, but with the right steps and configurations, it can greatly improve performance and avlability. By creating multiple instances, distributing workload and using shared storage, data avlability and response time can be considerably improved.