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ORA-00020: maximum number of processes (%s) exceeded
ORA-00020: Maximum Number of Processes Exceeded
When an Oracle database receives more requests than it can handle, it may return the error message "ORA-00020: maximum number of processes (%s) exceeded." This error occurs when the number of processes in the database exceeds the value set in the initialization parameter. To resolve this issue, the system administrator can increase the value of the "processes" parameter in the database.
1. Log in as SYSDBA
To make changes to the "processes" parameter, the user must log in as SYSDBA. This can be done by running the following command in the SQL Command Line:
connect sys as sysdba
2. ALTER SYSTEM commands
After logging in as SYSDBA, the user can use the ALTER SYSTEM command to modify the "processes" parameter. The recommended values for "processes," "sessions," and "transactions" are:
- PROCESSES = 150
- SESSIONS = 300
- TRANSACTIONS = 330
The following commands can be used to modify these parameters:
alter system set processes = 150 scope = spfile;
alter system set sessions = 300 scope = spfile;
alter system set transactions = 330 scope = spfile;
Note that these changes will not take effect until the database is restarted.
3. Verify the new parameters
To verify that the new parameters have been set correctly, the user can run the following SELECT statement:
select name, value
from v$parameter
where name in ('processes', 'sessions', 'transactions');
This will display the current values of the "processes," "sessions," and "transactions" parameters.
Frequently Asked Questions
How to Increase the Maximum Number of Processes in Oracle?
To increase the maximum number of processes in Oracle, you can use the alter system command to modify the processes initialization parameter. For example, to set the maximum number of processes to 500, you can run the following command:
alter system set processes=500 scope=spfile;
After running this command, you need to restart the database for the changes to take effect.
What is the PROCESSES Initialization Parameter in Oracle?
The PROCESSES initialization parameter in Oracle specifies the maximum number of operating system processes that can be connected to the database concurrently. Each user connection to the database consumes one process. Therefore, the value of the PROCESSES parameter determines the maximum number of users that can connect to the database at the same time.
What is the Maximum Number of Processes in Oracle?
The maximum number of processes in Oracle is determined by the value of the PROCESSES initialization parameter. The default value of this parameter is platform-dependent. You can check the current value of the PROCESSES parameter by running the following SQL command:
show parameter processes;
How Do I Check the Current Process Limit Usage in Oracle?
To check the current process limit usage in Oracle, you can use the following SQL command:
select count(*) from v$process;
This command returns the number of currently active processes in the database.
What Causes the ORA-00020 Error in Oracle?
The ORA-00020 error in Oracle occurs when the maximum number of processes allowed by the PROCESSES parameter is exceeded. This can happen when the database is under heavy load or when there are too many user connections to the database.