Oracle's Automatic Shared Memory Management feature manages the size of the Streams pool when the SGA_TARGET initialization parameter is set to a nonzero value. If the STREAMS_POOL_SIZE initialization parameter also is set to a nonzero value, then Automatic Shared Memory Management uses this value as a minimum for the Streams pool.

If SGA_TARGET is set to a nonzero value and STREAMS_POOL_SIZE is not specified or is set to a null value, Automatic Shared Memory Management uses 0 (zero) bytes as a minimum for the Streams pool.

If the STREAMS_POOL_SIZE initialization parameter is set to a nonzero value, and the SGA_TARGET parameter is set to 0 (zero), then the Streams pool size is the value specified by the STREAMS_POOL_SIZE parameter, in bytes.

If both the STREAMS_POOL_SIZE and the SGA_TARGET initialization parameters are set to 0 (zero), then, by default, on the first request for Streams pool memory in a database, an amount of memory equal to 10% of the shared pool is transferred from the buffer cache to the Streams pool. Products and features that use the Streams pool include Oracle GoldenGate, XStream, Oracle Streams, Oracle Advanced Queuing, and Oracle Data Pump.

The Streams pool is a shared resource, and the amount of memory a process can use from the Streams pool is determined by the application. The capture or apply parameter MAX_SGA_SIZE can be controlled for Oracle GoldenGate or XStream. For Oracle Advanced Queuing, use the procedures in the dbms_aqadm package to control the amount of Streams Pool needed.