For a CDB, the root container's SESSIONS parameter specifies the total number of sessions … Its value defaults to the root container's SESSIONS value. Calculation of Processes by Hardware of System: PARALLEL_MAX_SERVERS depends on the CPU cores in the database server available for database (total CPU cores on database server minus CPU requirements of other applications including SAP central instance), PARALLEL_MAX_SERVERS = Number of DB machine CPU CORES*10, Processes = (ABAP Work Processes * 2) + Parallel_Max_Servers + 40 = (25*2) + 40 + 40 = 130, PROCESSES = J2EE server processes * + PARALLEL_MAX_SERVERS + 40, J2EE Server Processes = 2 (if two server nodes – Server0 and Server1), Max Connections = Open the Visual Administrator and select Server -> Services -> JDBC Connector = 50. specifies the maximum number of operating system user processes that can simultaneously connect to Oracle. For example, if you are using Advanced Queuing or the file mapping feature, you will have additional background processes. It has another rule though: If we set lower value of sessions parameters than derived value, Oracle will automatically bump it to above derived value. To fix this, increase the processes parameter, usually doubling the value to allow for future growth. Your operating system-specific Oracle documentation for the range of values, Oracle Database Concepts for an introduction to Oracle database instance processes. If you plan on running 50 user processes, a good estimate would be to set the, 221643 – Oracle Message: “ERROR system.database – ORA-00020: maximum number of. http://docs.oracle.com/cd/B10501_01/server.920/a96536/ch1168.htm#REFRN10175. Therefore, Oracle recommends that you adjust the value of SESSIONS to approximately 1.1 * total number of connections. The SESSIONS parameter for a PDB can only be modified by the PDB. If you are using Automatic Storage Management, then add three additional processes for the database instance. Goal This note provides the formula to Calculate the Proper Values for Sessions and Transactions Initialization Parameters Based on Processes Parameter. In a shared server environment, the value of PROCESSES can be quite small. The number of background processes will vary according the database features that you are using. Database Reference 1.255 PROCESSES PROCESSES specifies the maximum number of operating system user processes that can simultaneously connect to Oracle. PROCESSES specifies the maximum number of operating system user processes that can simultaneously connect to Oracle. The OERR command shows these details for the ORA-00020 error: ORA-00020: maximum number of processes (string) exceeded. Therefore, if you increase the value of SESSIONS, you should consider whether to adjust the values of ENQUEUE_RESOURCES and TRANSACTIONS as well. SAP Notes for Recommended Oracle Parameters: 830576 – Parameter recommendations for Oracle 10g, 1431798 – Oracle 11.2.0: Database Parameter Settings, Backup Failed: http://scn.sap.com/thread/1398677, Archival failed with below reason http://scn.sap.com/thread/1251972, Solution Manager crashes every two week or so: http://scn.sap.com/thread/3333727, Background jobs failed http://scn.sap.com/thread/1980217, Database check failed: http://scn.sap.com/thread/1226748, Transport Terminated: http://scn.sap.com/thread/461606, Error in Portal System: http://scn.sap.com/thread/18638. The value for this parameter should allow for all background processes such as locks, job queue processes, and parallel execution processes. The value of this parameter must be a minimum of one for each background process plus one for each user process. Oracle Cloud Infrastructure - Database Service - Version N/A and later Oracle Database Backup Service - Version N/A and later Information in this document applies to any platform. 2) Do some analysis as to why you have 1000 processes connected to the database. The number of background processes will vary according the database features that you are using. Therefore, if you change the value of PROCESSES, you should evaluate whether to adjust the values of those derived parameters. Multiple instances can have different values. PROCESSES specifies the maximum number of operating system user processes that can simultaneously connect to Oracle. The default values of the ENQUEUE_RESOURCES and TRANSACTIONS parameters are derived from SESSIONS. That relationship is 1 oracle process / session -> many java connections, the connection pooling, done by the Java app server, not Oracle. For example, if you are using Advanced Queuing or the file mapping feature, you will have additional background processes. Solution Manager crashes every two week or so. SESSIONS specifies the maximum number of sessions that can be created in the system. SESSIONS CALCULATION: (1.1 * PROCESSES) + 5. In 10g, oracle used to derive sessions parameter from processes parameter using following formula. Therefore, Oracle recommends that you adjust the value of SESSIONS to approximately 1.1 * total number of connections. If you plan on running 50 user processes, a good estimate would be to set the PROCESSES initialization parameter to 70. http://docs.oracle.com/cd/B28359_01/server.111/b28310/create005.htm#ADMIN11108, 221643 – Oracle Message: “ERROR system.database – ORA-00020: maximum number of     processes (%s) exceeded”, 34432 – ORA-00020: maximum number of processes exceeded.

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