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DRCP uses a connection broker that assigns each new client session to an available pooled server. Once the client connection s request is served by the database, the connection releases the pooled server back to the server pool. Thus, the sessions use memory and other resources only while the database is actually performing tasks for the sessions and release those resources when they release the pooled server back to the pool of servers. As long as the database doesn t reach the maximum number of pooled servers, the connection broker will create a pooled server to assign to a new client connection, if it can t find a free pooled server. Once the maximum number of pooled servers is reached, the connection broker can t create a new pooled server. It sends the client connections to a wait queue until some pooled servers are freed up. Unlike in a dedicated server approach where the amount of (PGA) memory used is proportional to the number of user sessions, under DRCP, the amount of memory is proportional to the number of active pooled servers. The following example shows how you can make significant gains in memory usage by switching to DRCP from a dedicated server configuration. In the example, I assume that there are a total of 5,000 client connections, and that each client session requires 200KB of memory and each server process requires 5MB of memory. Also, let s assume that you need a maximum of 200 server connections. You can compute the total memory requirements for the dedicated server configuration and the DRCP method as shown: Dedicated server Total memory required = 5000 X (200KB + 5MB) = 260GB Database Resident Connection Pooling Total Memory Required = 200 X (200KB + 5MB) = Shared Server 500 X 200KB + 200 X 5MB = 502 MB
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You can see that while a dedicated server configuration requires a total of 260GB, you ll need only a little over a half gigabyte under the DRCP configuration.
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Enabling and Disabling DRCP
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By default, the database comes preconfigured with a default connection pool named SYS_ DEFAULT_CONNECTION_POOL. You must, however, start the default connection pool in order to take advantage of the DRCP feature. You start the connection pool by executing the START_POOL procedure of the DBMS_CONNECTION_POOL package, as shown here: SQL> connect sys/sammyy1 as sysdba SQL> exec dbms_connection_pool.start_pool(); PL/SQL procedure successfully completed. SQL> You can check the status of the connection pool with the following query: SQL> select connection_pool, status, maxsize from dba_cpool_info; CONNECTION_POOL ---------------------------SYS_DEFAULT_CONNECTION_POOL SQL> STATUS -----ACTIVE MAXSIZE -------80
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Once you start the connection pool, it will remain open even if you stop the database and start it back up again. You can stop the connection pool by executing the STOP_POOL procedure, as shown here: SQL> exec dbms_connection_pool.stop_pool(); PL/SQL procedure successfully completed. SQL> The background process Connection Monitor (CMON) manages the connection pool. Applications hand back dedicated server processes to the CMON process, which returns the process back to the connection pool. You can specify the DRCP connection in the following way: If you re using an EZ Connect string, specify POOLED in the string, as shown here: myhost.comany.com:1521/mydb.company.com:POOLED If you re using a tnsnames.ora file, specify SERVER=POOLED in the TNS connect string, as shown here: mydb = (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp) (HOST=myhost.company.com) (SERVER=POOLED)))
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You use the following parameters to configure DRCP in your database: You can configure the connection pool based on your database s usage requirements. Here are the main DRCP configuration parameters: INACTIVITY TIMEOUT: Maximum idle time allowable for a pooled server before it is terminated MAX_LIFETIME_PER_SESSION: The time to live (TTL) duration for a pooled session MAX_USES_PER_SESSION: The maximum number of times a pooled server can be released to the connection pool
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