How to modify the number of connections in oracle

Oracle is an enterprise-level relational database management system that is widely used. In Oracle, the number of connections refers to the number of client connections that the database can support simultaneously. When the number of connections is too low, it may cause system crashes or performance issues. Therefore, it is necessary to modify the number of Oracle connections.

Oracle supports two connection methods: shared server and independent server. In shared server mode, multiple clients will share a server resource, while in independent server mode, each client will have its own server process. In the default shared server mode, Oracle can support 150 client connections at the same time.

If you need to increase the number of connections, you can follow the steps below.

Step one: Confirm the current number of connections

In Oracle, you can use the following command to confirm the current number of connections:

select value from v$parameter where name='processes';

This will output the maximum connection currently supported by the database number.

Step 2: Confirm the usage of the current number of connections

You can use the following command to check the usage of the current number of connections:

select count(*) from v$session;

This will output the current number of connections.

Step 3: Modify the number of connections

To modify the number of connections, you need to modify the database parameters first. You can use the following command to modify the maximum number of connections:

alter system set processes=200 scope=spfile;

This will set the maximum number of connections to 200, which will take effect after the database is restarted. If you want it to take effect immediately, you can use the following command:

alter system set processes=200;

This will set the maximum number of connections to 200, but it will become invalid after the database is restarted.

Step 4: Restart the database

After modifying the database parameters, you need to restart Oracle to make it effective. Oracle can be restarted using the following command:

shutdown immediate;
startup;

This will shut down and restart the Oracle database.

Summary

The number of Oracle database connections has an important impact on the performance and stability of the system and needs to be adjusted according to specific circumstances. When changing the maximum number of connections, you need to pay attention to security and the scope of the system to ensure that the system does not crash or other problems.

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